Home » Public Forums » GMCnet » Fuel pump replacement
| Fuel pump replacement [message #275675] |
Sun, 12 April 2015 07:25  |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Hi all:
We were doing regular maintenance on our coach (77 Kingsley) and the fuel pump came up in discussion. We have no idea when it was replaced by the previous owner, so it's at least 3-4 years old (could be 20 years old, we don't know). I know there are some that are for and against replacing it just as peace of mind, mainly from degradation from ethanol, etc. But... my question is how much work is it to replace the mechanical fuel pump on the 403? I was looking and the AC compressor sits right next to it, so I can't tell if the fuel pump will come out on its own without having to remove something else first. I thought I'd ask before we attempt it, just to see if there are any tricks.
Still not sure if we'll replace it just because or let it go and deal with it if and when it became a problem.
Thanks!!
--
Chris
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
[Updated on: Sun, 12 April 2015 08:06] Report message to a moderator |
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| Re: [GMCnet] Fuel pump replacement [message #275681 is a reply to message #275675] |
Sun, 12 April 2015 10:08  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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LW, It's no more work on a 403 than it is on a 455. Easiest way is to
remove the inner fender to gain access. Hard part is scraping the old
gasket off. (very important) A newly installed pump is no assurance of
longevity. Today's parts are questionable at best. If you have a pump that
is performing well, my advice is to use it until it doesn't. Carry a spare
with you and odds are, you will not need it. But, if you don't carry a
spare, Murphy is out there looking for guys that don't carry them. Jus
sayin'.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Apr 12, 2015 5:26 AM, "LW" wrote:
> Hi all:
>
> We were doing regular maintenance on our coach (77 Kingsley) and the fuel
> pump came up in discussion. We have no idea when it was replaced by the
> previous owner, so it's at least 3-4 years old (could be 20 years old, we
> don't know). I know there are some that are for and against replacing it
> just as peace of mind, mainly from degradation from ethanol, etc. But...
> my question is how much work is it to replace the mechanical fuel pump on
> the 403? I was looking and the AC compressor sits right next to it, so I
> can't tell if the fuel pump will come out on its own without having to
> remove something else first. I thought I'd ask before we attempt it, just
> to see if here are any tricks.
>
> Still not sure if we'll replace it just because or let it go and deal with
> it if and when it became a problem.
>
> Thanks!!
>
> --
> Chris
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: Fuel pump replacement [message #275688 is a reply to message #275675] |
Sun, 12 April 2015 13:13 |
mickey szilagyi
Messages: 273
Registered: January 2013
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Jim, thanks for the tips on the fuel pump and getting to it through the fender well. In looking at it, it looks like the AC compressor and bracket might be in the way since the fuel pump has that long lever/arm on it that has to go inside the engine. We've replaced a fuel pump on other vehicles and it seems like there needed to be plenty of space to get the new pump and that arm lined up and inside. Do you recall if the AC compressor has to be removed to replace the pump. We're kind of thinking ahead in case we're on the road somewhere and the pump goes bad - like to have an idea on what it's going to take to do it. Thanks again for your advice and help.
Mickey
1977 Kingsley, 403, Lansing, MI
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| Re: [GMCnet] Fuel pump replacement [message #275689 is a reply to message #275688] |
Sun, 12 April 2015 13:30 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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No, the nut on the water pump stud that retains the a/c brace needs to be
loosened and the brace needs to detach from the a/c compressor to allow
access to both bolts on the fuel pump. The pump can easily be manipulated
into place within available space between the block and compressor. The
fuel lines need to be loosened before the pump is, and before they ( the
fuel lines) are tightened you should start the threads while the pump can
be wiggled around. Assemble all fittings by hand as well as the pump bolts
before you tighten any of it. Much easier.
Jim Hupy
Salem, Oregon
78 GMC ROYALE 403
On Apr 12, 2015 11:14 AM, "Mickey Szilagyi"
wrote:
> Jim, thanks for the tips on the fuel pump and getting to it through the
> fender well. In looking at it, it looks like the AC compressor and bracket
> might be in the way since the fuel pump has that long lever/arm on it that
> has to go inside the engine. We've replaced a fuel pump on other vehicles
> and it seems like there needed to be plenty of space to get the new pump
> and that arm lined up and inside. Do you recall if the AC compressor has to
> be removed to replace the pump. We're kind of thinking ahead in case
> we're on the road somewhere and the pump goes bad - like to have an idea on
> what
> it's going to take to do it. Thanks again for your advice and help.
> --
> Mickey
> 1977 Kingsley, 403, Lansing, MI
> _______________________________________________
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| Re: Fuel pump replacement [message #275724 is a reply to message #275722] |
Sun, 12 April 2015 21:48 |
Tony Cook
Messages: 121
Registered: August 2014
Location: Torrance CA
Karma: 0
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Just did mine wasn't going to but glad i did i had all my fuel lines done and tanks refurbished and when i pulled the pump there was tons of rust and gunk in it left over . I didn't have to fuss with AC i got to the bolts one from underneath and one from top.actually it's just one bolt the other i think the top is a stud just loosen and pump will slip out. There is plenty of play to get it out. But yea the hard fuel line going to the carb was a major PITA so definitely start those threads when pump is still wobbly
Tony Cook
77' Kingsley ' SuperSession 77 '
Torrance Beach,CA
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| Re: Fuel pump replacement [message #276245 is a reply to message #275772] |
Sun, 19 April 2015 20:09 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
Karma: 1
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Thanks all. We did tackle it this weekend and just as you all mentioned, the old one came out with ease. It sure didn't look like there was enough room but plenty to turn it slightly and out it came. We ended up having one guy on top and one underneath the coach, between the two of us it made it a lot easier than doing it alone. New one installed and hope we are good for a very long time! Thanks again for all of the help.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Fuel pump replacement [message #276731 is a reply to message #276729] |
Sun, 26 April 2015 05:54 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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read here
http://www.gmcmhphotos.com/photos/3-port-recirculating-fuel-pump/p41501-3-port-fuel-pump.html
and here
http://gmc49ers.blogspot.com/2014/07/the-four-amigos-rally.html
erf
On Sun, Apr 26, 2015 at 2:06 AM, donovan wrote:
> Somewhere, someone mentioned using the third pipe on the new fuel pumps to
> prevent hydro lock (sp) but I cant find anywhere else that tells where
> to run the hose to. Or maybe im thinking something completely
> different. The point is, whoever mentioned it said instead of blocking
> that line off
> like all of ours are, run a hose to something.
>
> I know that all sounds vague, im hoping someone recognizes some of it
> :d
> --
> Donovan, Greenville SC
> 1975 Eleganza II
> 81,500 miles
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Fuel pump replacement [message #276733 is a reply to message #276729] |
Sun, 26 April 2015 06:30 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Donovan,
Gene's already answered your basic question. But let me correct one
misconception before it spreads: The 3-pipe fuel pumps are not "new".
They were used on air conditioned Toronados circa 1970's. Both 2 and 3
pipe pumps were "always", and still are, available. In fact, the NAPA part
numbers for the two are only 1 digit apart (which number I don't recall).
Ken H.
On Sun, Apr 26, 2015 at 5:06 AM, donovan wrote:
> Somewhere, someone mentioned using the third pipe on the new fuel pumps to
> prevent hydro lock (sp) but I cant find anywhere else that tells where
> to run the hose to. Or maybe im thinking something completely
> different. The point is, whoever mentioned it said instead of blocking
> that line off
> like all of ours are, run a hose to something.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Fuel pump replacement [message #276741 is a reply to message #276733] |
Sun, 26 April 2015 10:26 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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The M6108 is the regular fuel pump and the M6109 is the pump with the return line.
JR Wright
GMC Great Laker MHC
GMC Eastern States
GMCMHI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Apr 26, 2015, at 7:30 AM, Ken Henderson wrote:
>
> Donovan,
>
> Gene's already answered your basic question. But let me correct one
> misconception before it spreads: The 3-pipe fuel pumps are not "new".
> They were used on air conditioned Toronados circa 1970's. Both 2 and 3
> pipe pumps were "always", and still are, available. In fact, the NAPA part
> numbers for the two are only 1 digit apart (which number I don't recall).
>
> Ken H.
>
>
> On Sun, Apr 26, 2015 at 5:06 AM, donovan wrote:
>
>> Somewhere, someone mentioned using the third pipe on the new fuel pumps to
>> prevent hydro lock (sp) but I cant find anywhere else that tells where
>> to run the hose to. Or maybe im thinking something completely
>> different. The point is, whoever mentioned it said instead of blocking
>> that line off
>> like all of ours are, run a hose to something.
>>
> _______________________________________________
> 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
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Fuel pump replacement [message #276749 is a reply to message #276729] |
Sun, 26 April 2015 12:01 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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I accidentally deleted the reply to the email below that had a couple of URLs about using the 3-pipe pump.
I'd greatly appreciate a resend of that email.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"
> Date: Sun, 26 Apr 2015 03:06:01 -0600
> To: gmclist@temp.gmcnet.org
> From: dto29605@gmail.com
> Subject: Re: [GMCnet] Fuel pump replacement
>
> Somewhere, someone mentioned using the third pipe on the new fuel pumps to prevent hydro lock (sp) but I cant find anywhere else that tells where
> to run the hose to. Or maybe im thinking something completely different. The point is, whoever mentioned it said instead of blocking that line off
> like all of ours are, run a hose to something.
>
> I know that all sounds vague, im hoping someone recognizes some of it :d
> --
> Donovan, Greenville SC
> 1975 Eleganza II
> 81,500 miles
> _______________________________________________
> 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:
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| Re: [GMCnet] Fuel pump replacement [message #276751 is a reply to message #276749] |
Sun, 26 April 2015 12:32 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Mac,
I can easily send you the entire thread, but for future reference for
everyone, you may want to try this:
Google "GMCNet Archive" which will lead you to the GMCNet Archive Google
Group
Search for "Fuel Pump Replacement"
Sort by date
The entire thread (all the way back to 12 April) will be presented.
It's a handy procedure to know.
Ken H.
On Sun, Apr 26, 2015 at 1:01 PM, D C _Mac_ Macdonald
wrote:
> I accidentally deleted the reply to the email below that had a couple of
> URLs about using the 3-pipe pump.
>
> I'd greatly appreciate a resend of that email.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ______________
> |[ ]~~~[][ ][]\
> "--OO--[]---O-"
>
>
>
>> Date: Sun, 26 Apr 2015 03:06:01 -0600
>> To: gmclist@temp.gmcnet.org
>> From: dto29605@gmail.com
>> Subject: Re: [GMCnet] Fuel pump replacement
>>
>> Somewhere, someone mentioned using the third pipe on the new fuel pumps
> to prevent hydro lock (sp) but I cant find anywhere else that tells
> where
>> to run the hose to. Or maybe im thinking something completely
> different. The point is, whoever mentioned it said instead of blocking
> that line off
>> like all of ours are, run a hose to something.
>>
>> I know that all sounds vague, im hoping someone recognizes some of it
> :d
>> --
>> Donovan, Greenville SC
>> 1975 Eleganza II
>> 81,500 miles
>> _______________________________________________
>> 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
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Fuel pump replacement [message #276754 is a reply to message #276751] |
Sun, 26 April 2015 13:53 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Thanks, Ken.
I've stored your message (below) in my GMCMH/Fuel folder.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"
> From: hend4800@bellsouth.net
> Date: Sun, 26 Apr 2015 13:32:02 -0400
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Fuel pump replacement
>
> Mac,
>
> I can easily send you the entire thread, but for future reference for
> everyone, you may want to try this:
>
> Google "GMCNet Archive" which will lead you to the GMCNet Archive Google
> Group
> Search for "Fuel Pump Replacement"
> Sort by date
> The entire thread (all the way back to 12 April) will be presented.
>
> It's a handy procedure to know.
>
> Ken H.
>
>
> On Sun, Apr 26, 2015 at 1:01 PM, D C _Mac_ Macdonald
> wrote:
>
>> I accidentally deleted the reply to the email below that had a couple of
>> URLs about using the 3-pipe pump.
>>
>> I'd greatly appreciate a resend of that email.
>>
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>> ~~ ~ D C "Mac" Macdonald ~ ~~
>> ~ ~ Amateur Radio - K2GKK ~ ~
>> ~ ~ USAF and FAA, Retired ~ ~
>> ~ ~ ~ Oklahoma City, OK ~ ~ ~
>> ~~ ~ ~ "The Money Pit" ~ ~ ~~
>> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
>> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
>> ~~ k2gkk + hotmail dot com ~~
>> ~ www.gmcmhphotos.com/okclb ~
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>> ______________
>> |[ ]~~~[][ ][]\
>> "--OO--[]---O-"
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| Re: [GMCnet] Fuel pump replacement [message #276773 is a reply to message #276771] |
Sun, 26 April 2015 18:39 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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I am Billy on this, Remove the pump and put a block off plate in its place.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
> On Apr 26, 2015, at 7:23 PM, Billy Massey wrote:
>
> A thin rubber diaphragm between pressurized gasoline and engine oil with no
> warning of impending failure.
>
> bdub
>
> On Sun, Apr 26, 2015 at 6:06 PM, Pete Smith wrote:
>
>> If one had (say)in tank electric pumps is there any reason not to bypass
>> the mechanical pump and just leave it there rather than remove it and fit a
>> blanking plate?
>>
>>
> _______________________________________________
> 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
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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