Home » Public Forums » GMCnet » Gas tank/line project report
| Gas tank/line project report [message #85690] |
Sat, 22 May 2010 22:36  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Netters,
I just dropped my gas tanks today to replace the fuel lines. Pictures are at:
<http://www.gmcmhphotos.com/photos/showphoto.php?photo=34068&title=gas-tanks-2c-fuel-line-replacement&cat=3>
I had run the caoch almost out of gas in anticipation of this project, and pumped only about 2-1/2 gallons out of each tank with the electric pump. My son helped me get them out from under the coach and we were only able to dump another quart or so out of the filler. Nice to know that my pick-ups are so close to the bottoms of the tanks.
A couple of other interesting observations; On the top of the front tank was written "CLAMP LSE" and, sure enough, it was slightly loose. ??????? weird, huh ??????? There was also a little more residue around that filler, but no evidence of a leak bad enough to show up. Also the fuel lines on the tops of the tanks have a GM number on them. Could they be original? Dan G. agrees that they might be. The coach has been in the SW (Texas and Arizona) all of it's life as far as I can tell.
I will post further pictures as I progress.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Gas tank/line project report [message #85714 is a reply to message #85690] |
Sun, 23 May 2010 08:54  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Carl,
When I did mine, I used hard fuel lines connected to the pickups to
run across the tops of the tanks. I used duct tape to hold them in
place while I reinstalled the tanks. The hard lines go all the way to
the edges of the tanks plus a few extra inches to make it easy to
replace the lines the next time without dropping the tanks. Using the
expensive barrier fuel line is a good recommendation. I just don't
see that stuff ever having the problems that nearly everything mfrd in
the past has. Expensive stuff, but an excellent product.
I also use an ele pump exclusively, and where the supply line comes
out ahead of the first step in the L wheel well, I went up from there
and routed the line from the rear of the engine. This eliminates
about 10 feet of rusty fuel line that runs to the front, across the
front crossmember to the fuel pump, and the section that went from the
pump to the carb. I insulated the new section and foil wrapped it to
ensure isolation from heat sources.
While you're in there, run separate vent lines all the way fwd and
tie them together just before they connect to the filler. Two is
better than one where they are routed along the frame and use hard
lines. Hard lines are forever. If you can bend a vibration loop in
the section that extends from the wheel well up the back of the
engine, you will be ahead of me.
On Sat, May 22, 2010 at 8:36 PM, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
>
> Netters,
>
> I just dropped my gas tanks today to replace the fuel lines. Pictures are at:
>
> <http://www.gmcmhphotos.com/photos/showphoto.php?photo=34068&title=gas-tanks-2c-fuel-line-replacement&cat=3>
>
> I had run the caoch almost out of gas in anticipation of this project, and pumped only about 2-1/2 gallons out of each tank with the electric pump. My son helped me get them out from under the coach and we were only able to dump another quart or so out of the filler. Nice to know that my pick-ups are so close to the bottoms of the tanks.
>
> A couple of other interesting observations; On the top of the front tank was written "CLAMP LSE" and, sure enough, it was slightly loose. ??????? weird, huh ??????? There was also a little more residue around that filler, but no evidence of a leak bad enough to show up. Also the fuel lines on the tops of the tanks have a GM number on them. Could they be original? Dan G. agrees that they might be. The coach has been in the SW (Texas and Arizona) all of it's life as far as I can tell.
>
> I will post further pictures as I progress.
>
>
>
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Gas tank/line project report [message #85761 is a reply to message #85699] |
Sun, 23 May 2010 21:56 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| Robert Mueller wrote on Sun, 23 May 2010 00:14 |
A few ideas to consider:
A) LOCATE THE POSITION OF THE FUEL PICKUP / SENDERS IN THE COACH FLOOR:
Regards,
Rob Mueller
Sydney, Australia
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Rob - If someone has a 73 or 74 coach with the 1" thick all plywood floor (no insulation) it is very easy to locate the filler area on the floor. The factory has a recess milled into the floor to provide room for the pickup fittings as shown here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=24748&title=getting-started&cat=4936
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Gas tank/line project report [message #85768 is a reply to message #85766] |
Sun, 23 May 2010 22:20 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| Robert Mueller wrote on Sun, 23 May 2010 22:10 |
Steve,
Cool, looks like all you have to do is:
A) find the center of that recess and drill a small hole up through the
floor to know where to cut the access port if you want to at a later date.
B) use the same size hole saw and finish cutting through the floor now.
I wonder why they cut the recess in plywood and not the insulation?
I don't remember seeing a recess in the insulation on the bottom of Double
Trouble when we dropped the tanks at the COOP. Maybe my CRS had flared up at
the time?
Rob Mueller
Sydney, Australia
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On 73 & 74 coaches there is no insulation. Just a 1" thick plywood floor. Later coaches had 3/4" floors and that may have given enough clearance to make the recess unnecessary. In any event it my understanding that the later coaches, yours being one of them did not have the recess.
As another note the 73/74 coaches have no insulation over the original location mufflers so you need to add a heat shield of some type to prevent scorching the floors. They can even catch fire, right Dan?
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Gas tank/line project report [message #85782 is a reply to message #85772] |
Mon, 24 May 2010 06:54 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Yes Dan, I have had many early model coaches come in with charred under floor wood at the mufflers. Actually I have not seen any of the insulator plates people talk about on them. When we replumb the exhaust we always do put some sort of shield.
Another issue since you guys are talking about the fuel tanks is not just accessing the senders but you must make sure the hoses are not getthing pinched from the crushed body pads. Also, the pressed on tank fittings are starting to losen up. We always drop the tanks, send them out to be cleaned out, pressure tested and have all the fittings silver soldered. Of course to do this you need to remove the tanks-- not a fun job but if you're going to go all the way it is important to do so.
Also, we check the vapor seperator, AB solenoid, backflush the forward steel cross line and replace every hose, every clamp in the system front to back. I really feel this is the only way to truly rely upon the system. Yep, it's more work but after it's all done well once you probably will never need to access the senders again. I'm not much on screwing up the coach floor cutting access holes. I find less need to do that, rather spend that time doing a proper job on the project itself.
Of course there are contrasting views.
Jim Bounds
------------------------
----- Original Message ----
From: Dan Gregg <gregg_dan@hotmail.com>
To: gmclist@temp.gmcnet.org
Sent: Mon, May 24, 2010 12:45:16 AM
Subject: Re: [GMCnet] Gas tank/line project report
As another note the 73/74 coaches have no insulation over the original location mufflers so you need to add a heat shield of some type to prevent scorching the floors. They can even catch fire, right Dan?
[/quote]
Amen Steve
--
Dan & Teri Gregg
http://danandteri.blogspot.com/
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| Re: [GMCnet] Gas tank/line project report [message #85784 is a reply to message #85761] |
Mon, 24 May 2010 07:16 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Steve,
I have similar reliefs above the black tank on my 73, 230, but they do not correspond to anything, They also appear to be through drilled with plugs.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=31249&nocache=1
Dennis Sexton
73 GMC Painted Desert
Germantown, TN
USA
-----Original Message-----
From: Steve Southworth <midlf@centurytel.net>
To: gmclist@temp.gmcnet.org
Sent: Sun, May 23, 2010 9:56 pm
Subject: Re: [GMCnet] Gas tank/line project report
Robert Mueller wrote on Sun, 23 May 2010 00:14
A few ideas to consider:
A) LOCATE THE POSITION OF THE FUEL PICKUP / SENDERS IN THE COACH FLOOR:
Regards,
Rob Mueller
Sydney, Australia
ob - If someone has a 73 or 74 coach with the 1" thick all plywood floor (no
nsulation) it is very easy to locate the filler area on the floor. The factory
as a recess milled into the floor to provide room for the pickup fittings as
hown here:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=24748&title=getting-started&cat=4936
--
teve Southworth
974 Glacier TZE064V100150
almyra WI
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MCnet mailing list
ist Information and Subscription Options:
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Gas tank/line project report [message #85819 is a reply to message #85699] |
Mon, 24 May 2010 09:59 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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Thanks Rob and Steve. All good suggestions.
I do not intend to cut holes in my floor to provide access to the sending units, although I may someday wish I had. I'm not too sure about compression fittings on top of the tanks either. I realize that would eliminate a possible future rubber hose failure, but I would like to have some flexibility at that connection. I may use hard lines on top of the tanks, or I might just stick with the rubber. I have not decided yet. Either way, I will use the best quality barrier type hose I can find.
I have never had ANY problem filling my tanks, but if you think separate vent lines are advisable, I might consider that. I also have not had any problems with the sending units, they work and the o-rings do not leak, so I am considering (on the advice of another fellow GMCer and good friend) leaving them alone. From what I can see inside the tanks, through the filler tube (admittedly not much) the tanks are very clean inside. I suspect this goes for the sending units/pick-ups too. There is a side of me that says to remove them and check/clean them anyway, but I am thinking the risks outweigh the benefits.
Any additional thoughts would be appreciated as none of this is set in stone.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Gas tank/line project report [message #85967 is a reply to message #85784] |
Mon, 24 May 2010 22:31 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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Very interesting. I hope to never have to find out if I have similar recesses cut in panel above my black tank. GRIN
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: Gas tank/line project report [message #85988 is a reply to message #85690] |
Tue, 25 May 2010 08:00 |
Oldngray
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
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How timely, I just filled up yesterday and had to sit for most of a hour until the fuel stopped running out onto the concrete.
Lots of fuel too. For some reason this time it leaked, now I have to drain 50 gallons or burn it on a trip so I can make the repairs.
I was under the impression that everything was new under there.
Perhaps it is just a clamp that went bad. Will report back.
This thread was very helpful.
Richard MacDonald
Punta Gorda, Florida
Sold our TZE April 2015
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| Re: [GMCnet] Gas tank/line project report [message #86002 is a reply to message #85993] |
Tue, 25 May 2010 10:04 |
Oldngray
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
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I seem to recall reading a thread about how to measure etc in order to cut the hole from up top, cannot find it now though.
| Mr ERFisher wrote on Tue, 25 May 2010 09:26 |
yesterday , using the measurements, I used the GMCTOOL and plunged sawed
out a 2 inch hole and found the sender without damage ti the sender or
hosess --(picures at 11 - well some time)
gene
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Richard MacDonald
Punta Gorda, Florida
Sold our TZE April 2015
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| Re: [GMCnet] Gas tank/line project report [message #86004 is a reply to message #86001] |
Tue, 25 May 2010 10:25 |
Oldngray
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
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Watching the money flow onto the concrete was one thing, the worst of it was, lord, there was a lot of gas on the ground, the smell, worrying about it catching fire, not being able to move the Coach as other folks pulled up to get fuel, some smoking cigarettes or leaving their engines running.
One Youngster (not a day over 12, at least that is what it looked like to me) driving a big Dodge pickup with enormous straight pipes, pulled in next to me, cigarette hanging out of his mouth and he was not about to shut the engine off. The Attendant, who was throwing sawdust under the Coach to soak up the gas was just about ready to push the big red button to shut the station down. I love Country folks (I'm one of them) but many of them just don't think. The young ones think they are Bullet proof too.
Richard MacDonald
Punta Gorda, Florida
Sold our TZE April 2015
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| Re: Gas tank/line project report [message #86509 is a reply to message #85690] |
Sat, 29 May 2010 12:23 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I'm re-openning an old thread here:
I just posted some progress pictures of my gas tank/line project to the photo site;
http://www.gmcmhphotos.com/photos/showphoto.php?photo=34163&title=gas-tanks-2c-fuel-line-replacement&cat=3
http://www.gmcmhphotos.com/photos/showphoto.php?photo=34161&title=gas-tanks-2c-fuel-line-replacement&cat=3
http://www.gmcmhphotos.com/photos/showphoto.php?photo=34159&title=gas-tanks-2c-fuel-line-replacement&cat=3
It took quite a bit of effort to get the tanks clean. I wanted to paint them to help protect them. I know the tops of the tanks will not be visible, but I like red for gas cans/tanks, so... I painted the bottoms white to help reflect heat from the road. I used Krylon Fusion because of it's superior adhesion qualities. I will continue to post pics as I progress.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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