Home » Public Forums » GMCnet » [GMCnet] 1976 Edgemont gasoline odor - additional input
| [GMCnet] 1976 Edgemont gasoline odor - additional input [message #114463] |
Mon, 07 February 2011 15:21  |
Ray and Verna Lucas
Messages: 25
Registered: February 2006
Karma: 0
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Junior Member |
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I just remembered an odd thing with the last fill up about 100 miles from
home.
I know the manual says I have 2 fuel tanks but the coach has never taken
more than 30 gallons and I always fill it on the slowest
setting.
Well at this fill up it took 42 gallons, more input for the mystery if this
helps anyone to help me solve it.
Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
exception????
Thanks again,
Ray
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| Re: [GMCnet] 1976 Edgemont gasoline odor - additional input [message #114465 is a reply to message #114463] |
Mon, 07 February 2011 15:32  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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| Ray and Verna Lucas wrote on Mon, 07 February 2011 16:21 |
I just remembered an odd thing with the last fill up about 100 miles from
home.
I know the manual says I have 2 fuel tanks but the coach has never taken
more than 30 gallons and I always fill it on the slowest
setting.
Well at this fill up it took 42 gallons, more input for the mystery if this
helps anyone to help me solve it.
Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
exception????
Thanks again,
Ray
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All except the ones that POs have changed. I sent you a link to the manuals http://www.bdub.net/factory-manuals.html If you download the parts manual also you can see where everstuff is and how it goes together. Hope this helps...
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] 1976 Edgemont gasoline odor - additional input [message #114466 is a reply to message #114463] |
Mon, 07 February 2011 15:35 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Ray
I think that adds to the likliihood that your fuel system "burped"
through the vent cannister.
Dennis
Sent from my iPhone
On Feb 7, 2011, at 3:21 PM, "Rlucas" <rlucas@centurytel.net> wrote:
> I just remembered an odd thing with the last fill up about 100 miles
> from
> home.
>
> I know the manual says I have 2 fuel tanks but the coach has never
> taken
> more than 30 gallons and I always fill it on the slowest
> setting.
> Well at this fill up it took 42 gallons, more input for the mystery
> if this
> helps anyone to help me solve it.
>
> Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
> exception????
>
> Thanks again,
>
> Ray
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://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] 1976 Edgemont gasoline odor - additional input [message #114467 is a reply to message #114463] |
Mon, 07 February 2011 15:43 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Ray, yes if they have not been altered from how thay left the factory, there
are two identical fuel tanks each with a capacity of approx 25 gallons. They
share a common fill manifold that is located on the same side of the coach
that the fuel filler door is located. In addition there is a selector valve
that the output goes to the mechanical fuel pump by a combination of rubber
and steel lines, the junctions of which can also leak. Each tank has a fuel
tank sender combined with a fuel and vent line on the top of the tank. The
"O" ring gasket on those sending units has been known to leak as well. Each
fuel line that comes from the tank sender should go to the selector valve.
The vent lines are connected together and go to the filler neck just below
the filler cap. Their purpose is to burp back a small amount of liquid fuel
to cancel the automatic fuel pump nozzle. They also have connections that
can loosen up and leak.
A quirk in the system is that fuel can and does readily transfer back and
forth, via the fill manifold, from the front tank to the rear and vise versa
when one travels uphill and downhill. Other than that, nothing to it.<Grin>
Jim Hupy
Salem, Or
78 GMC Royale 403
On Mon, Feb 7, 2011 at 1:21 PM, Rlucas <rlucas@centurytel.net> wrote:
> I just remembered an odd thing with the last fill up about 100 miles from
> home.
>
> I know the manual says I have 2 fuel tanks but the coach has never taken
> more than 30 gallons and I always fill it on the slowest
> setting.
> Well at this fill up it took 42 gallons, more input for the mystery if this
> helps anyone to help me solve it.
>
> Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
> exception????
>
> Thanks again,
>
> Ray
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] 1976 Edgemont gasoline odor - additional input [message #114469 is a reply to message #114467] |
Mon, 07 February 2011 16:05 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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H, Ray.
Based upon the next-to-last sentence in the first
paragraph of your message below, I am now thinking
that it could be a very BAD idea to try to top off
the fuel tanks in a GMC!
Let the pump shut off and continue the trip. Figure
that at worst you have maybe 40 gallons aboard, and
get 8 mpg at worst and you can safely go at least
300 miles before you need to refuel.
My bladder will demand a "DE-fueling" stop LONG
before that!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> Date: Mon, 7 Feb 2011 13:43:03 -0800
> From: jamesh1296@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] 1976 Edgemont gasoline odor - additional input
>
> Ray, yes if they have not been altered from how thay left the factory, there
> are two identical fuel tanks each with a capacity of approx 25 gallons. They
> share a common fill manifold that is located on the same side of the coach
> that the fuel filler door is located. In addition there is a selector valve
> that the output goes to the mechanical fuel pump by a combination of rubber
> and steel lines, the junctions of which can also leak. Each tank has a fuel
> tank sender combined with a fuel and vent line on the top of the tank. The
> "O" ring gasket on those sending units has been known to leak as well. Each
> fuel line that comes from the tank sender should go to the selector valve.
> The vent lines are connected together and go to the filler neck just below
> the filler cap. Their purpose is to burp back a small amount of liquid fuel
> to cancel the automatic fuel pump nozzle. They also have connections that
> can loosen up and leak.
>
> A quirk in the system is that fuel can and does readily transfer back and
> forth, via the fill manifold, from the front tank to the rear and vise versa
> when one travels uphill and downhill. Other than that, nothing to it.<Grin>
>
> Jim Hupy
> Salem, Or
> 78 GMC Royale 403
>
>
>
>
> On Mon, Feb 7, 2011 at 1:21 PM, Rlucas <rlucas@centurytel.net> wrote:
>
> > I just remembered an odd thing with the last fill up about 100 miles from
> > home.
> >
> > I know the manual says I have 2 fuel tanks but the coach has never taken
> > more than 30 gallons and I always fill it on the slowest
> > setting.
> > Well at this fill up it took 42 gallons, more input for the mystery if this
> > helps anyone to help me solve it.
> >
> > Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
> > exception????
> >
> > Thanks again,
> >
> > Ray
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| Re: [GMCnet] 1976 Edgemont gasoline odor - additional input [message #114488 is a reply to message #114463] |
Mon, 07 February 2011 18:47 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ray,
Yes, all GMC's have two 25 gallon fuel tanks; I have filled Double Trouble
with as much as 47 gallons!
There's any number of reasons you could be smelling gas when filling up but
to "bullet proof" your fuel supply system you might want to consider the
following:
1) Drop the tanks
2) Remove the sending units and clean / replace the strainers and
verify/bend the fuel pickup tube to get the most fuel out of the tank.
http://www.appliedgmc.com/prod.itml/icOid/1011
3) Inspect the tanks for rust and repair as required.
http://www.por15.com/Fuel-System-Restoration/products/12/
4) Replace all the rubber hoses with ethanol compatible hoses.
http://www.goodyearep.com/ProductListing.aspx?folderid=1036
http://tinyurl.com/4czv8wv
5) Inspect / replace the large steel fill tubes for rust and inspect /
replace the rubber fill tube connections:
a) in drivers side wheel well.
http://www.appliedgmc.com/prod.itml/icOid/855
b) between main and aux tanks.
http://www.appliedgmc.com/prod.itml/icOid/567
c) at rear tank inlet.
http://www.appliedgmc.com/prod.itml/icOid/859
6) Replace the sending units o-ring on each tank.
http://www.appliedgmc.com/prod.itml/icOid/916
7) Make sure the fill check valve in the drivers side rear wheel well is
operating properly.
http://www.appliedgmc.com/prod.itml/icOid/792
8) Install an in-line filter with a steel housing between the outlet of the
steel line that is attached to the top of the front cross member and the
mechanical fuel pump inlet.
9) Run separate vent lines from each tank to the fuel filler neck, join them
in a "T" as close to the point where they attach to the filler neck. This
will help them vent easier and reduce the "burping" when you fill up.
10) Use stainless steel hose clamps at every connection.
11) Replace the Quadrajet fuel inlet filter.
If anyone can think of anything else GO FOR IT!
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rlucas
Sent: Tuesday, February 08, 2011 8:22 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] 1976 Edgemont gasoline odor - additional input
I just remembered an odd thing with the last fill up about 100 miles from
home.
I know the manual says I have 2 fuel tanks but the coach has never taken
more than 30 gallons and I always fill it on the slowest
setting.
Well at this fill up it took 42 gallons, more input for the mystery if this
helps anyone to help me solve it.
Do ALL GMC's of this type have 2 - 25 gallon fuel tanks, without
exception????
Thanks again,
Ray
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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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] 1976 Edgemont gasoline odor - additional input [message #114537 is a reply to message #114523] |
Tue, 08 February 2011 07:08 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dan,
I'm blaming it on CRS as you'd know better that's for sure! ;-)
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Dan Borlase
Sent: Tuesday, February 08, 2011 3:22 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] 1976 Edgemont gasoline odor - additional input
Rob...I bought Arthur Linnwoods stretch...he had two tanks custom made, one,
a 25 gal. and the seconed. a 40 gal.
Both made of aluminum.
Judi and I are looking forward to continuing our adventure at month end.
Keep you all posted.
Dan
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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] 1976 Edgemont gasoline odor - additional input [message #114539 is a reply to message #114488] |
Tue, 08 February 2011 07:18 |
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Hardie Johnson
Messages: 483
Registered: January 2004
Location: Raleigh NC
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Mon, 07 February 2011 19:47 |
<>There's any number of reasons you could be smelling gas when filling up but to "bullet proof" your fuel supply system you might want to consider the following:
1) Drop the tanks
2) Remove the sending units and clean / replace the strainers and verify/bend the fuel pickup tube to get the most fuel out of the tank.(trimmage)<>
|
That is very good advice. Do you like the mod of using steel tube across the top of the tanks and adding an access port from the interior?
"Belt, suspenders and piece of twine"
Hardie Johnson "Crashj"
1973 26 foot Glacier, White Thing
Raleigh NC
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