Home » Public Forums » GMCnet » ALMOST MADE IT
| ALMOST MADE IT [message #127647] |
Fri, 27 May 2011 14:06  |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Some of you may have read my earlier post "bunch of loosly related questions". In that post I mentioned my plan to get my coach 10miles from my home shop to my body shop to get the roof sealed and painted over Memorial Day weekend. I made it off the freeway and about 400 feet from my shop before rig pooped out and left me stranded in an intersection. After pulling the engine cover I noticed a large quantity of fuel boiling on the intake manifold and the carb appeared to have puddled fuel on top of the lower butterflies. After apening all the windows and obtaining a fire extinguisher I soaked up the fuel and cycled the key to turn on fuel pump. Fuel began seeping out the lower linkages and the top plate of the carb as well as filling the lower butter flies again. I called a few gear head buddies and they tell me that the float is stuck. I pulled the fuel filter housing to find that there is no filter in there. The carb is a quadrajet, motor is 455. I have been told by a couple of people that I should throw away the quadrajunk and get a Holly/edelbrock/etc. I was originally planning on running this carb until I could complete my research on fuel injection/intake manifold combos. It worked well when I drove it home at time of purchase. Should I throw it away or pull it and clean it? If I do get a new carb, what should I get?
Unfortunately the coach is now parked on the street in front of my shop(got a handful of people to push) rather than inside as it needs to run to get it in the building. Hoping for a quick solution even if temporary so I can limp it in the building to finish the roof.
Thanks,
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: ALMOST MADE IT [message #127650 is a reply to message #127647] |
Fri, 27 May 2011 14:43  |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Senior Member |
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I'd agree. If you do decide to use the quadrajet, rebuilding services are available (Springfield Ignition - Dick Patterson). The carb is quite complex and unique to the GMC motorhome, so if it is original and rebuildable, do not throw it away as people are looking for them as cores.
With the fuel situation these days, fuel injection is not a bad idea (though there are others that will differ). As technicians get younger and younger, there are more that have never seen or touched a car with a carburator, so the future does not look good for continued easy service of carburators.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] ALMOST MADE IT [message #127653 is a reply to message #127647] |
Fri, 27 May 2011 14:46 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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The quadrajet is a good carburetor for the GMC -- and if original, the core value is high. Often, a new, quality gasket set is all that is needed -- the shafts don't get a lot of wear from frequent opening and closing.
Short-term -- pull the top of the carb and check the float. The older floats are prone to leak. Replacements can be found at NAPA. Even without a replacement -- let it drain to empty, and it should work at least long enough to get you off the street.
Oh, I usually find it easier to pull the carb for most work. The retaining bolts only need to be torqued to about 9 ft lbs when you go back on -- if you decide to pull it. Do you have an electric fuel pump or the original mechanical?
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: sgltrac <sgltrac@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Fri, May 27, 2011 2:06 pm
Subject: [GMCnet] ALMOST MADE IT
Some of you may have read my earlier post "bunch of loosly related questions".
n that post I mentioned my plan to get my coach 10miles from my home shop to my
ody shop to get the roof sealed and painted over Memorial Day weekend. I made
t off the freeway and about 400 feet from my shop before rig pooped out and
eft me stranded in an intersection. After pulling the engine cover I noticed a
arge quantity of fuel boiling on the intake manifold and the carb appeared to
ave puddled fuel on top of the lower butterflies. After apening all the windows
nd obtaining a fire extinguisher I soaked up the fuel and cycled the key to
urn on fuel pump. Fuel began seeping out the lower linkages and the top plate
f the carb as well as filling the lower butter flies again. I called a few gear
ead buddies and they tell me that the float is stuck. I pulled the fuel filter
ousing to find that there is no filter in there. The carb is a quadrajet, motor
s 455. I have been told by a couple
of people that I should throw away the quadrajunk and get a
olly/edelbrock/etc. I was originally planning on running this carb until I
ould complete my research on fuel injection/intake manifold combos. It worked
ell when I drove it home at time of purchase. Should I throw it away or pull it
nd clean it? If I do get a new carb, what should I get?
Unfortunately the coach is now parked on the street in front of my shop(got a
andful of people to push) rather than inside as it needs to run to get it in
he building. Hoping for a quick solution even if temporary so I can limp it in
he building to finish the roof.
Thanks,
-
ully
7 Royale basket case.
uture motorhome land speed record holder(bucket list)
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Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Fri, 27 May 2011 14:52] Report message to a moderator |
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| Re: ALMOST MADE IT [message #127654 is a reply to message #127647] |
Fri, 27 May 2011 14:56 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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| sgltrac wrote on Fri, 27 May 2011 14:06 |
Some of you may have read my earlier post "bunch of loosly related questions". In that post I mentioned my plan to get my coach 10miles from my home shop to my body shop to get the roof sealed and painted over Memorial Day weekend. I made it off the freeway and about 400 feet from my shop before rig pooped out and left me stranded in an intersection. After pulling the engine cover I noticed a large quantity of fuel boiling on the intake manifold and the carb appeared to have puddled fuel on top of the lower butterflies. After apening all the windows and obtaining a fire extinguisher I soaked up the fuel and cycled the key to turn on fuel pump. Fuel began seeping out the lower linkages and the top plate of the carb as well as filling the lower butter flies again. I called a few gear head buddies and they tell me that the float is stuck. I pulled the fuel filter housing to find that there is no filter in there. The carb is a quadrajet, motor is 455. I have been told by a couple of people that I should throw away the quadrajunk and get a Holly/edelbrock/etc. I was originally planning on running this carb until I could complete my research on fuel injection/intake manifold combos. It worked well when I drove it home at time of purchase. Should I throw it away or pull it and clean it? If I do get a new carb, what should I get?
Unfortunately the coach is now parked on the street in front of my shop(got a handful of people to push) rather than inside as it needs to run to get it in the building. Hoping for a quick solution even if temporary so I can limp it in the building to finish the roof.
Thanks,
|
Sully,
Here is a link to a photo album to show the carb disassembly...
http://www.gmcmhphotos.com/photos/showphoto.php?photo=8712&cat=3776
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] ALMOST MADE IT [message #127655 is a reply to message #127653] |
Fri, 27 May 2011 14:56 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Electric fuel pump. The carb is not orignal. Still have orig but damaged by earlier engine fire(which is how I ended up with it)
Sully
77royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Dennis S <dennisfsexton@aol.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Fri, 27 May 2011 15:46:06
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] ALMOST MADE IT
The quadrajet is a good carburetor for the GMC -- and if original, the core value is high. Often, a new, quality gasket set is all that is needed -- the shafts don't get a lot of wear from frequent opening and closing.
Short-term -- pull the top of the carb and check the float. The older floats are prone to leak. Replacements can be found at NAPA. Even without a replacement -- let it drain to empty, and it should work at least long enough to get you off the street.
Oh, I usually find it easier to pull the carb for most work. The retaining bolts only need to be torqued to about 9 ft lbs when you go back on -- if you decide to pull it. Do you have and electric fuel pump or the original mechanical?
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: sgltrac <sgltrac@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Fri, May 27, 2011 2:06 pm
Subject: [GMCnet] ALMOST MADE IT
Some of you may have read my earlier post "bunch of loosly related questions".
n that post I mentioned my plan to get my coach 10miles from my home shop to my
ody shop to get the roof sealed and painted over Memorial Day weekend. I made
t off the freeway and about 400 feet from my shop before rig pooped out and
eft me stranded in an intersection. After pulling the engine cover I noticed a
arge quantity of fuel boiling on the intake manifold and the carb appeared to
ave puddled fuel on top of the lower butterflies. After apening all the windows
nd obtaining a fire extinguisher I soaked up the fuel and cycled the key to
urn on fuel pump. Fuel began seeping out the lower linkages and the top plate
f the carb as well as filling the lower butter flies again. I called a few gear
ead buddies and they tell me that the float is stuck. I pulled the fuel filter
ousing to find that there is no filter in there. The carb is a quadrajet, motor
s 455. I have been told by a couple
of people that I should throw away the quadrajunk and get a
olly/edelbrock/etc. I was originally planning on running this carb until I
ould complete my research on fuel injection/intake manifold combos. It worked
ell when I drove it home at time of purchase. Should I throw it away or pull it
nd clean it? If I do get a new carb, what should I get?
Unfortunately the coach is now parked on the street in front of my shop(got a
andful of people to push) rather than inside as it needs to run to get it in
he building. Hoping for a quick solution even if temporary so I can limp it in
he building to finish the roof.
Thanks,
-
ully
7 Royale basket case.
uture motorhome land speed record holder(bucket list)
______________________________________________
MCnet mailing list
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] ALMOST MADE IT [message #127656 is a reply to message #127655] |
Fri, 27 May 2011 15:02 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Sully,
Try rapping on the side of the float bowl chamber with a small hammer/whatever -- it might temporarily loosen a stuck float. (At least one that is not leaking.) Then briefly run your electirc pump to see if the leak stopped.
Dennis
-----Original Message-----
From: sgltrac@gmail.com
To: gmclist@temp.gmcnet.org
Sent: Fri, May 27, 2011 2:56 pm
Subject: Re: [GMCnet] ALMOST MADE IT
Electric fuel pump. The carb is not orignal. Still have orig but damaged by
arlier engine fire(which is how I ended up with it)
Sully
7royale
ent from my Verizon Wireless BlackBerry
-----Original Message-----
rom: Dennis S <dennisfsexton@aol.com>
ender: gmclist-bounces@temp.gmcnet.org
ate: Fri, 27 May 2011 15:46:06
o: <gmclist@temp.gmcnet.org>
eply-To: gmclist@temp.gmcnet.org
ubject: Re: [GMCnet] ALMOST MADE IT
he quadrajet is a good carburetor for the GMC -- and if original, the core
alue is high. Often, a new, quality gasket set is all that is needed -- the
hafts don't get a lot of wear from frequent opening and closing.
Short-term -- pull the top of the carb and check the float. The older floats are
rone to leak. Replacements can be found at NAPA. Even without a replacement --
et it drain to empty, and it should work at least long enough to get you off
he street.
Oh, I usually find it easier to pull the carb for most work. The retaining bolts
nly need to be torqued to about 9 ft lbs when you go back on -- if you decide
o pull it. Do you have and electric fuel pump or the original mechanical?
ennis Sexton
3 GMC
ermantown, TN
SA
-----Original Message-----
rom: sgltrac <sgltrac@gmail.com>
o: gmclist@temp.gmcnet.org
ent: Fri, May 27, 2011 2:06 pm
ubject: [GMCnet] ALMOST MADE IT
Some of you may have read my earlier post "bunch of loosly related questions".
that post I mentioned my plan to get my coach 10miles from my home shop to my
dy shop to get the roof sealed and painted over Memorial Day weekend. I made
off the freeway and about 400 feet from my shop before rig pooped out and
ft me stranded in an intersection. After pulling the engine cover I noticed a
rge quantity of fuel boiling on the intake manifold and the carb appeared to
ve puddled fuel on top of the lower butterflies. After apening all the windows
d obtaining a fire extinguisher I soaked up the fuel and cycled the key to
rn on fuel pump. Fuel began seeping out the lower linkages and the top plate
the carb as well as filling the lower butter flies again. I called a few gear
ad buddies and they tell me that the float is stuck. I pulled the fuel filter
using to find that there is no filter in there. The carb is a quadrajet, motor
455. I have been told by a couple
of people that I should throw away the quadrajunk and get a
lly/edelbrock/etc. I was originally planning on running this carb until I
uld complete my research on fuel injection/intake manifold combos. It worked
ll when I drove it home at time of purchase. Should I throw it away or pull it
d clean it? If I do get a new carb, what should I get?
nfortunately the coach is now parked on the street in front of my shop(got a
ndful of people to push) rather than inside as it needs to run to get it in
e building. Hoping for a quick solution even if temporary so I can limp it in
e building to finish the roof.
hanks,
lly
Royale basket case.
ture motorhome land speed record holder(bucket list)
_____________________________________________
Cnet mailing list
subscribe or Change List Options:
tp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] ALMOST MADE IT [message #127657 is a reply to message #127656] |
Fri, 27 May 2011 15:08 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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Thanks dennis. Tried that. I just pulled it and am going to pop the top off and take a look.
Sully
77royale
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: Dennis S <dennisfsexton@aol.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Fri, 27 May 2011 16:02:43
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] ALMOST MADE IT
Sully,
Try rapping on the side of the float bowl chamber with a small hammer/whatever -- it might temporarily loosen a stuck float. (At least one that is not leaking.) Then briefly run your electirc pump to see if the leak stopped.
Dennis
-----Original Message-----
From: sgltrac@gmail.com
To: gmclist@temp.gmcnet.org
Sent: Fri, May 27, 2011 2:56 pm
Subject: Re: [GMCnet] ALMOST MADE IT
Electric fuel pump. The carb is not orignal. Still have orig but damaged by
arlier engine fire(which is how I ended up with it)
Sully
7royale
ent from my Verizon Wireless BlackBerry
-----Original Message-----
rom: Dennis S <dennisfsexton@aol.com>
ender: gmclist-bounces@temp.gmcnet.org
ate: Fri, 27 May 2011 15:46:06
o: <gmclist@temp.gmcnet.org>
eply-To: gmclist@temp.gmcnet.org
ubject: Re: [GMCnet] ALMOST MADE IT
he quadrajet is a good carburetor for the GMC -- and if original, the core
alue is high. Often, a new, quality gasket set is all that is needed -- the
hafts don't get a lot of wear from frequent opening and closing.
Short-term -- pull the top of the carb and check the float. The older floats are
rone to leak. Replacements can be found at NAPA. Even without a replacement --
et it drain to empty, and it should work at least long enough to get you off
he street.
Oh, I usually find it easier to pull the carb for most work. The retaining bolts
nly need to be torqued to about 9 ft lbs when you go back on -- if you decide
o pull it. Do you have and electric fuel pump or the original mechanical?
ennis Sexton
3 GMC
ermantown, TN
SA
-----Original Message-----
rom: sgltrac <sgltrac@gmail.com>
o: gmclist@temp.gmcnet.org
ent: Fri, May 27, 2011 2:06 pm
ubject: [GMCnet] ALMOST MADE IT
Some of you may have read my earlier post "bunch of loosly related questions".
that post I mentioned my plan to get my coach 10miles from my home shop to my
dy shop to get the roof sealed and painted over Memorial Day weekend. I made
off the freeway and about 400 feet from my shop before rig pooped out and
ft me stranded in an intersection. After pulling the engine cover I noticed a
rge quantity of fuel boiling on the intake manifold and the carb appeared to
ve puddled fuel on top of the lower butterflies. After apening all the windows
d obtaining a fire extinguisher I soaked up the fuel and cycled the key to
rn on fuel pump. Fuel began seeping out the lower linkages and the top plate
the carb as well as filling the lower butter flies again. I called a few gear
ad buddies and they tell me that the float is stuck. I pulled the fuel filter
using to find that there is no filter in there. The carb is a quadrajet, motor
455. I have been told by a couple
of people that I should throw away the quadrajunk and get a
lly/edelbrock/etc. I was originally planning on running this carb until I
uld complete my research on fuel injection/intake manifold combos. It worked
ll when I drove it home at time of purchase. Should I throw it away or pull it
d clean it? If I do get a new carb, what should I get?
nfortunately the coach is now parked on the street in front of my shop(got a
ndful of people to push) rather than inside as it needs to run to get it in
e building. Hoping for a quick solution even if temporary so I can limp it in
e building to finish the roof.
hanks,
lly
Royale basket case.
ture motorhome land speed record holder(bucket list)
_____________________________________________
Cnet mailing list
subscribe or Change List Options:
tp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] ALMOST MADE IT [message #127659 is a reply to message #127647] |
Fri, 27 May 2011 15:35 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On May 27, 2011, at 1:06 PM, sgltrac wrote:
>
>
> Some of you may have read my earlier post "bunch of loosly related questions". In that post I mentioned my plan to get my coach 10miles from my home shop to my body shop to get the roof sealed and painted over Memorial Day weekend. I made it off the freeway and about 400 feet from my shop before rig pooped out and left me stranded in an intersection. After pulling the engine cover I noticed a large quantity of fuel boiling on the intake manifold and the carb appeared to have puddled fuel on top of the lower butterflies. After apening all the windows and obtaining a fire extinguisher I soaked up the fuel and cycled the key to turn on fuel pump. Fuel began seeping out the lower linkages and the top plate of the carb as well as filling the lower butter flies again. I called a few gear head buddies and they tell me that the float is stuck. I pulled the fuel filter housing to find that there is no filter in there. The carb is a quadrajet, motor is 455. I have been told by a coup
le
> of people that I should throw away the quadrajunk and get a Holly/edelbrock/etc. I was originally planning on running this carb until I could complete my research on fuel injection/intake manifold combos. It worked well when I drove it home at time of purchase. Should I throw it away or pull it and clean it? If I do get a new carb, what should I get?
>
> Unfortunately the coach is now parked on the street in front of my shop(got a handful of people to push) rather than inside as it needs to run to get it in the building. Hoping for a quick solution even if temporary so I can limp it in the building to finish the roof.
>
> Thanks,
> --
> Sully
> 7
Even if the car is not the original, it still might just be a GMC motorhome carb. There are some differences inside that are needed for the motorhome. If you don't have the motorhome carb they it isn't good for rebuilding or a trade in.
Here is some info for you:
GM used seven different carbs for the GMC motorhome. 73 and 74 years had a carb #7043254
75 and 76 and early 77 had 7045254 except for California emision carbs which were 7045554
77 coaches with the 403 engine had 17057254 and California 17057559
78 had 17058254 and California 1758559
These carb numbers can be found on the left side of the carb, stamped on the flat surface close to the secondary throttle shaft.
There is also a date code (4 digits) stamped in the same area. 73 to 76 coachs had a number starting with 70
77 & 78 carbs start with 170.
Some parts for these carbs are quite different on the 170 from the 70. DO NOT INTERCHANGE parts between these two series.
One example is the primary metering rods. They are .080" shorter in the 170 series, they had a different taper to the rods and these carbs used different sizes of primary jets.
The rods for the 70 series carbs will be stamped D-50. (7046338) I am told that this was used ONLY in the GMC motorhome carbs. The 170 series are different. All GMC carbs used the same secondary metering rods. These will be stamped with a CJ. The primary jets for the GMC at your elevation should be .070". (7031970)
The proper power spring for the GMC is #7036019 which has an operating range from 4" to 8" of vacuum.
One problem that some people have had is the use of gaskets from an unknown kit. There are changes in the air passages in the carbs and it is easy to install a gasket that covers an air passage hole and that will make the carb perform improperly.
The Delco overhaul kit for the 73-74 is 7046812. For the 75-76 (non Calif) it is 17051886
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] ALMOST MADE IT [message #127661 is a reply to message #127657] |
Fri, 27 May 2011 15:48 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| sgltrac wrote on Fri, 27 May 2011 15:08 |
Thanks dennis. Tried that. I just pulled it and am going to pop the top off and take a look.
Sully
77royale
Sent from my Verizon Wireless BlackBerry
|
Look in the needle and seat area. With the filter removed I'll bet you have some dirt or rust stuck in it. Clean it out and install a filter in the carb. They are $2 to $4 at most any auto parts store. If the filter spring is missing and you can not find one then put an inline filter in the rubber hose on the input side of the mechanical pump.
If it still floods after doing the above, check the fuel pump pressure going in to the carb. It should be around 5 PSI.
This does not sound like a major issue.
KEEP the Quadrajet and forget the Edlebrock. Also keep the original one from the coach. It is slightly different than others and very valuable.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] ALMOST MADE IT [message #127665 is a reply to message #127661] |
Fri, 27 May 2011 15:59 |
JimGunther
Messages: 228
Registered: March 2007
Location: West Haven, CT
Karma: 0
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Senior Member |
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TRY THE EASY STUFF FIRST
Try some carb cleaner, Sea Foam or whatever before throwing-the-baby-out-with-the-bathwater.
I have a (what was) a brand new Holley 390 on my StalkerV6 (Lotus 7 replicar) and have to give it a godd rinsing every other season. Have hardly any miles on it but the gas does a number on the innards - especially if it's not driven much.
BTW: I know I have "the problem" when fuel shoots out of the carb like a fountain!
Jim Gunther
www.LotusV6.com
now former owner - ;(
73 GMC-II 2600
by Explorer
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| Re: ALMOST MADE IT [message #127673 is a reply to message #127647] |
Fri, 27 May 2011 17:21 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I case you don't know there are 2 "secret" screws that hold the top plate to the body in the primary bores. Don't pry or force. My guess is float is soggy.. I like Qjets to echo Emery and they are often malligned by racers who don't understand them. Quite simple and ingenious really.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] ALMOST MADE IT [message #127676 is a reply to message #127657] |
Fri, 27 May 2011 18:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Sully, with the information that you have given us, I believe that I know
the coach that you have. Was it a mild burn job on the drivers side, with
some mickey moused electrical wiring in the area of the alternator, and some
jury rigging on the carb linkage? Without seeing it for sure, and knowing
that it does not have a carb filter installed, I would guess that you have
some crud in the inlet float valve, or a non floating float. Both are
equally possible without a carb filter. The quadrajet is a completely
adequate carb when unmolested. Others have given you Dick Patterson's name.
He is great with those carbs. The electric pumps have a higher fuel volume
delivery than the mechanical pumps, and in most cases deliver higher
pressure also. Without a pressure regulator and fuel return back to the
tanks, if you have a problem with the inlet valve in the carb, the engine
will perform exactly as you have described. It has been previously mentioned
here that there has not been an automobile manufactured in the US with a
carb for more than 20 years and the technicians working today are not
trained in repair of them. Takes some of us old farts to fix em any more.
Got one to work on next week as a matter of fact, along with a cam chain and
replace intake manifold gaskets, and radiator. I am working harder in
retirement than I want to, that is for sure. Keep all of us posted on what
you find.
Jim Hupy
Salem, Or
78 GMc Royale 403
On Fri, May 27, 2011 at 1:08 PM, <sgltrac@gmail.com> wrote:
> Thanks dennis. Tried that. I just pulled it and am going to pop the top off
> and take a look.
>
> Sully
> 77royale
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Dennis S <dennisfsexton@aol.com>
> Sender: gmclist-bounces@temp.gmcnet.org
> Date: Fri, 27 May 2011 16:02:43
> To: <gmclist@temp.gmcnet.org>
> Reply-To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] ALMOST MADE IT
>
>
> Sully,
>
> Try rapping on the side of the float bowl chamber with a small
> hammer/whatever -- it might temporarily loosen a stuck float. (At least one
> that is not leaking.) Then briefly run your electirc pump to see if the leak
> stopped.
>
>
> Dennis
>
> -----Original Message-----
> From: sgltrac@gmail.com
> To: gmclist@temp.gmcnet.org
> Sent: Fri, May 27, 2011 2:56 pm
> Subject: Re: [GMCnet] ALMOST MADE IT
>
>
> Electric fuel pump. The carb is not orignal. Still have orig but damaged by
> arlier engine fire(which is how I ended up with it)
> Sully
> 7royale
> ent from my Verizon Wireless BlackBerry
> -----Original Message-----
> rom: Dennis S <dennisfsexton@aol.com>
> ender: gmclist-bounces@temp.gmcnet.org
> ate: Fri, 27 May 2011 15:46:06
> o: <gmclist@temp.gmcnet.org>
> eply-To: gmclist@temp.gmcnet.org
> ubject: Re: [GMCnet] ALMOST MADE IT
>
> he quadrajet is a good carburetor for the GMC -- and if original, the core
> alue is high. Often, a new, quality gasket set is all that is needed -- the
> hafts don't get a lot of wear from frequent opening and closing.
> Short-term -- pull the top of the carb and check the float. The older
> floats are
> rone to leak. Replacements can be found at NAPA. Even without a replacement
> --
> et it drain to empty, and it should work at least long enough to get you
> off
> he street.
> Oh, I usually find it easier to pull the carb for most work. The retaining
> bolts
> nly need to be torqued to about 9 ft lbs when you go back on -- if you
> decide
> o pull it. Do you have and electric fuel pump or the original mechanical?
>
> ennis Sexton
> 3 GMC
> ermantown, TN
> SA
>
> -----Original Message-----
> rom: sgltrac <sgltrac@gmail.com>
> o: gmclist@temp.gmcnet.org
> ent: Fri, May 27, 2011 2:06 pm
> ubject: [GMCnet] ALMOST MADE IT
>
> Some of you may have read my earlier post "bunch of loosly related
> questions".
> that post I mentioned my plan to get my coach 10miles from my home shop to
> my
> dy shop to get the roof sealed and painted over Memorial Day weekend. I
> made
> off the freeway and about 400 feet from my shop before rig pooped out and
> ft me stranded in an intersection. After pulling the engine cover I noticed
> a
> rge quantity of fuel boiling on the intake manifold and the carb appeared
> to
> ve puddled fuel on top of the lower butterflies. After apening all the
> windows
> d obtaining a fire extinguisher I soaked up the fuel and cycled the key to
> rn on fuel pump. Fuel began seeping out the lower linkages and the top
> plate
> the carb as well as filling the lower butter flies again. I called a few
> gear
> ad buddies and they tell me that the float is stuck. I pulled the fuel
> filter
> using to find that there is no filter in there. The carb is a quadrajet,
> motor
> 455. I have been told by a couple
> of people that I should throw away the quadrajunk and get a
> lly/edelbrock/etc. I was originally planning on running this carb until I
> uld complete my research on fuel injection/intake manifold combos. It
> worked
> ll when I drove it home at time of purchase. Should I throw it away or pull
> it
> d clean it? If I do get a new carb, what should I get?
> nfortunately the coach is now parked on the street in front of my shop(got
> a
> ndful of people to push) rather than inside as it needs to run to get it in
> e building. Hoping for a quick solution even if temporary so I can limp it
> in
> e building to finish the roof.
> hanks,
>
> lly
> Royale basket case.
> ture motorhome land speed record holder(bucket list)
> _____________________________________________
> Cnet mailing list
> subscribe or Change List Options:
> tp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> MCnet mailing list
> nsubscribe or Change List Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> ______________________________________________
> MCnet mailing list
> nsubscribe or Change List Options:
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>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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> _______________________________________________
> GMCnet mailing list
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>
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| Re: [GMCnet] ALMOST MADE IT [message #127678 is a reply to message #127661] |
Fri, 27 May 2011 18:46 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Sully,
I'll second Ken's advice. From what I've read in this thread it will "fix"
the problem at hand.
I would modify his suggestion slightly and install "an inline filter in the
rubber hose on the input side of the mechanical pump" whether or not you
install the filter in the carb. The reason being the condition of the fuel
tanks and fuel lines on your GMC is unknown. Therefore it is more than
likely for more crud to come down the line. The fuel filter in the carb is
rather small and it is a PITA to change. The one upstream of the mechanical
fuel pump will be MUCH easier to get to and replace if (or should I say
when) it gets clogged up AGAIN. If you decide to take this advice I would
get the BIGGEST filter I could so that it will take a lot of crud to plug
it. You could install a clear plastic filter so you could monitor it,
however, you should take the location into consideration before doing so.
I have a metal housed filter installed at the fuel pump inlet on Double
Trouble and each year I replace it at the start of our tour of the USA. To
date I have not had any problems with crud in the fuel lines. HOWEVER, the
fuel tanks on Double Trouble have been dropped and cleaned, the fuel
strainers on the pickups have been replaced and all the fuel lines (fuel
supply and vent) have been replaced with alcohol compatible lines from
Goodyear.
As far as whether to keep the carb or install FI goes that's completely
unrelated to the problem at hand. A good argument can be placed for going
either direction. There are pluses and minuses to both directions.
To me at this point in time all you really need to do is be able to drive
the Royale safely.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
_______________________________________________
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] ALMOST MADE IT [message #127680 is a reply to message #127657] |
Fri, 27 May 2011 18:56 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Take a large screwdriver handle and tap it around the front area of
the carb so the float heedle will release.
Those people that are telling you to use a Holly should shut up .
There is nothing wrong with the Quadra jet carb.
On Fri, May 27, 2011 at 1:08 PM, <sgltrac@gmail.com> wrote:
> Thanks dennis. Tried that. I just pulled it and am going to pop the top off and take a look.
>
> Sully
> 77royale
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: Dennis S <dennisfsexton@aol.com>
> Sender: gmclist-bounces@temp.gmcnet.org
> Date: Fri, 27 May 2011 16:02:43
> To: <gmclist@temp.gmcnet.org>
> Reply-To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] ALMOST MADE IT
>
>
> Sully,
>
> Try rapping on the side of the float bowl chamber with a small hammer/whatever -- it might temporarily loosen a stuck float. (At least one that is not leaking.) Then briefly run your electirc pump to see if the leak stopped.
>
>
> Dennis
>
> -----Original Message-----
> From: sgltrac@gmail.com
> To: gmclist@temp.gmcnet.org
> Sent: Fri, May 27, 2011 2:56 pm
> Subject: Re: [GMCnet] ALMOST MADE IT
>
>
> Electric fuel pump. The carb is not orignal. Still have orig but damaged by
> arlier engine fire(which is how I ended up with it)
> Sully
> 7royale
> ent from my Verizon Wireless BlackBerry
> -----Original Message-----
> rom: Dennis S <dennisfsexton@aol.com>
> ender: gmclist-bounces@temp.gmcnet.org
> ate: Fri, 27 May 2011 15:46:06
> o: <gmclist@temp.gmcnet.org>
> eply-To: gmclist@temp.gmcnet.org
> ubject: Re: [GMCnet] ALMOST MADE IT
>
> he quadrajet is a good carburetor for the GMC -- and if original, the core
> alue is high. Often, a new, quality gasket set is all that is needed -- the
> hafts don't get a lot of wear from frequent opening and closing.
> Short-term -- pull the top of the carb and check the float. The older floats are
> rone to leak. Replacements can be found at NAPA. Even without a replacement --
> et it drain to empty, and it should work at least long enough to get you off
> he street.
> Oh, I usually find it easier to pull the carb for most work. The retaining bolts
> nly need to be torqued to about 9 ft lbs when you go back on -- if you decide
> o pull it. Do you have and electric fuel pump or the original mechanical?
>
> ennis Sexton
> 3 GMC
> ermantown, TN
> SA
>
> -----Original Message-----
> rom: sgltrac <sgltrac@gmail.com>
> o: gmclist@temp.gmcnet.org
> ent: Fri, May 27, 2011 2:06 pm
> ubject: [GMCnet] ALMOST MADE IT
>
> Some of you may have read my earlier post "bunch of loosly related questions".
> that post I mentioned my plan to get my coach 10miles from my home shop to my
> dy shop to get the roof sealed and painted over Memorial Day weekend. I made
> off the freeway and about 400 feet from my shop before rig pooped out and
> ft me stranded in an intersection. After pulling the engine cover I noticed a
> rge quantity of fuel boiling on the intake manifold and the carb appeared to
> ve puddled fuel on top of the lower butterflies. After apening all the windows
> d obtaining a fire extinguisher I soaked up the fuel and cycled the key to
> rn on fuel pump. Fuel began seeping out the lower linkages and the top plate
> the carb as well as filling the lower butter flies again. I called a few gear
> ad buddies and they tell me that the float is stuck. I pulled the fuel filter
> using to find that there is no filter in there. The carb is a quadrajet, motor
> 455. I have been told by a couple
> of people that I should throw away the quadrajunk and get a
> lly/edelbrock/etc. I was originally planning on running this carb until I
> uld complete my research on fuel injection/intake manifold combos. It worked
> ll when I drove it home at time of purchase. Should I throw it away or pull it
> d clean it? If I do get a new carb, what should I get?
> nfortunately the coach is now parked on the street in front of my shop(got a
> ndful of people to push) rather than inside as it needs to run to get it in
> e building. Hoping for a quick solution even if temporary so I can limp it in
> e building to finish the roof.
> hanks,
>
> lly
> Royale basket case.
> ture motorhome land speed record holder(bucket list)
> _____________________________________________
> Cnet mailing list
> subscribe or Change List Options:
> tp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> MCnet mailing list
> nsubscribe or Change List Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> ______________________________________________
> MCnet mailing list
> nsubscribe or Change List Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: ALMOST MADE IT [message #127690 is a reply to message #127673] |
Fri, 27 May 2011 20:29 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| JohnL455 wrote on Fri, 27 May 2011 15:21 |
I case you don't know there are 2 "secret" screws that hold the top plate to the body in the primary bores. Don't pry or force. My guess is float is soggy.. I like Qjets to echo Emery and they are often malligned by racers who don't understand them. Quite simple and ingenious really.
|
To get to the float, you have to take the carb apart just as far as for the power valve spring.
Here are instructions to get to the power valve spring:
<http://www.bdub.net/powervalve.html>
There are matching pictures with the parts labeled (with the step numbers) here: <http://www.gmcmhphotos.com/photos/showphoto.php?photo=8452>
Other notes:
-- Keep the original carb, at least as trading stock, regardless of what you end up using. For most people, a good stock Q-Jet is still the best option.
-- The PO of my '78 installed a Edelbrock (#1903). It works well and I get good gas mileage. I do not know if he changed anything in the new carb.
-- Fuel injection, by itself, most likely will not improve mileage enough to pay for itself... but does provide other benefits. IF you add a computer controlled distributor (CCD), it is POSSIBLE for the system to pay for itself in fuel savings.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] ALMOST MADE IT [message #127698 is a reply to message #127678] |
Fri, 27 May 2011 21:16 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
First and foremost, I got it in the building!!
Thanks to all of you who responded in my hour of need. I was able to remove the carb and carefully take it apart. I almost missed the "hidden screws" but when the air horn would not come off with a couple of taps with a plastic hammer I took those out and the top jumped off. After wrestling with the linkage to the acc pump and stuff I was able to gain access to the float and needle. The inlet at the needle seat was jammed with rusty crud which I blew back out the line into a rag(just so I could look at it). I did instal a filter in the carb(Oreilly's is right down the road and delivers) as well as purchase a see through filter to put in line. The in line filter is 1/4" and the line is 5/16 or 3/8 so it would not fit. No matter though since when I inspected the line I saw that it is not fuel rated line so its all gonna go anyway.
Im definately not throwing anything away. Lengthy experience in repair and limited experience in restoration has shown me that nothing gets thrown away until job completed(I even have all the rotten interior which I took out in December).
I don't think the old carb looks too bad but the guy I bought the coach from said it's "done". He had this other quadrajet that he pulled from god knows what laying around and threw it on. Same for the distributor.
The backyard brake booster/master felt great on the way to the shop.
On a wierd note, I was broken down in a major intersection for about a half hour and nobody honked or yelled at me the whole time! I couldnt believe it!
James, I would be curious to find out more about the mechanical history of this coach. You are correct in the description of the fire damage but I cannot speak to the wiring as it had been rigged back to basic operation before I bought it. When I bought it, there was a bad valve cover oil leak and the seller and I removed the valve covers to do gaskets and all of the rocker arms/springs and head looked brand new. It would be nice to know if the motor was rebuilt and if so by whom or if it just had heads done. The trans shifts quickly with a firm shift but it would be a benefit to know if trans has been rebuilt or not.
Vin is TZE367V100465. Whoever owned it was a Washington Huskies freak. That is for certain.
So the plan was to drive in at around 10 to miss freeway traffic(weeping radiator), determine what type of blocking I would need to enter in the building(street is 3 feet above shop floor and most low passenger cars will high center without blocking), move one of the frame machines and drive it in then get one of the guys to drive me back to pick up my daily P.O.S. By the time I had the carb back together it was around two. I still needed to get back home to get a driver prior to the onset of rush hour(not to mention the Mariniers are playing tonight),and we had three jobs to deliver. I could not bring the coach in til all cars that were leaving were out as it will partially block the ramp out of the building. Add to that the closed end rivits for the roof which were in stock a few days ago at Tacoma Screw were sold out when I called at 4. Everybody is closed this weekend and I need the rivits to re-secure and seal the roof prior to painting. I ran over to my local hardware store and bought some 3/16" rivits just in case I struck out but I really wanted the closed end ones so I diddnt have to worry about leaks down the crush arbor. After striking out at Tacoma Screw, the salesman suggested I call fastenal which I did. The closest store had 25 in stock which is about one less than I counted on the front and rear seams. If I ommit the ones under the rear AC unit I need 23. I got the rivits at 5:05(she stayed late thank goodness).
After much conversation with my 3m rep, I settled on using their seam sealer #8370 which has a softer final cure than the stuff we usually use for bonding car door skins to intrusion beams when we replace the skin. Reason being that I wanted the seam to remain flexible when the coach twists. Due to my carb emergency I did not call to have the sealer delivered in time and had to call another store and get them to stash it outside for me to pick up tomorrow on my way in. I am sure in the craziness of the day I have forgotten something I need and will have to improvise(not terribly uncommon)but I hope to have the roof sealed and painted, the nose repaired and gel coated, the shower spot gel coated and repainted with Imron(structural reinforcement done already)by Monday. Stay tuned 
VERY MUCH THANKS TO ALL OF YOU WHO RESPONDED WITH IDEAS AND EVEN A LINK TO STEP BY STEP FOR CARB TEARDOWN!!!!
Is this post too long???
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] ALMOST MADE IT [message #127699 is a reply to message #127698] |
Fri, 27 May 2011 21:25 |
jhb1
Messages: 303
Registered: February 2004
Karma: 0
|
Senior Member |
|
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Sully
No post is ever too long we all enjoy following each others projects and help where we can
John H. Bell
77 Royale; QuadBag,Manny OneTon,Honda EV4010, FITech
Montreal Qc.
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