Home » Public Forums » GMCnet » Fuel Smell After Refueling
| Fuel Smell After Refueling [message #227368] |
Mon, 28 October 2013 12:23  |
Jon payne
Messages: 495
Registered: May 2008
Karma: 1
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Senior Member |
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Guys,
Recently I starting to notice a fuel smell next to the drivers seat after refueling. It dissipates soon after I start driving. This happens regardless of the quantity of fuel I have added. In fact I just added about 10 gallons this weekend and the smell was present.
Since the fuel smell completely dissipate shortly after refueling I think I can rule out the fuel leaking inside the coach (where the fuel tube passes through).
Has anyone experienced this situation on their coach? What are the possible causes?
Jon Payne
76 Palm Beach
Westfield,IN
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| Re: Fuel Smell After Refueling [message #227393 is a reply to message #227391] |
Mon, 28 October 2013 14:49  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Jon Payne wrote on Mon, 28 October 2013 15:28 |
Thanks Matt, that makes a lot of sense!
When you mention "rerun both fill vent lines to the relocated T under the cab floor", can you please elaborate? What "T" fitting are you referring to and where are you suggesting the "T" fitting be relocated to?
Thanks again,
Jon
"http://www.gmcmhphotos.com/photos/data/5607/Fuel_Tank_Vent_Line.png
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Jon,
If that picture is accurate, then your system is different from what mine was. That picture has a long steel line with a branch fitted for the auxiliary tank fill vent. Mine was all rubber but has a plastic T for that fitting. Mine also had rubber all the way up to the vent fitting on the fill neck. If you are smelling fuel even if none is spilled at the fill neck, I suspect your does as well - and it, like mine, has gone bad.
I am suggesting (to you and everybody else) is, that if you are going to be messing around there anyway, relocate that T to just under the cab floor (where the flexible line ends in this picture).
The fuel gurgling problem is simply that the fuel is coming down the fill pipe with significant velocity. So, it goes into the main/rear tank first. When the main tank is full, the velocity head (the force of the moving fuel) pushes fuel up the vent tubing so air venting from the auxiliary tank has to drag it along to get out of the system. That is the gurgle that shuts the fill nozzle for you.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Fuel Smell After Refueling [message #227409 is a reply to message #227393] |
Mon, 28 October 2013 16:09 |
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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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Jon,
Like this:
http://www.gmcmhphotos.com/photos/random-photos/p51372-fuel-tank-vent-mod.html
The "T" should be as close to the filler neck as practical.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Matt Colie
Jon Payne wrote on Mon, 28 October 2013 15:28
> Thanks Matt, that makes a lot of sense!
>
> When you mention "rerun both fill vent lines to the relocated T under the cab floor", can you please elaborate? What "T" fitting
are you referring to and where are you suggesting the "T" fitting be relocated to?
>
> Thanks again,
> Jon
>
> "http://www.gmcmhphotos.com/photos/data/5607/Fuel_Tank_Vent_Line.png
Jon,
If that picture is accurate, then your system is different from what mine was. That picture has a long steel line with a branch
fitted for the auxiliary tank fill vent. Mine was all rubber but has a plastic T for that fitting. Mine also had rubber all the
way up to the vent fitting on the fill neck. If you are smelling fuel even if none is spilled at the fill neck, I suspect your does
as well - and it, like mine, has gone bad.
I am suggesting (to you and everybody else) is, that if you are going to be messing around there anyway, relocate that T to just
under the cab floor (where the flexible line ends in this picture).
The fuel gurgling problem is simply that the fuel is coming down the fill pipe with significant velocity. So, it goes into the
main/rear tank first. When the main tank is full, the velocity head (the force of the moving fuel) pushes fuel up the vent tubing
so air venting from the auxiliary tank has to drag it along to get out of the system. That is the gurgle that shuts the fill nozzle
for you.
Matt
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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] Fuel Smell After Refueling [message #227417 is a reply to message #227410] |
Mon, 28 October 2013 16:54 |
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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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David,
No place, that is a drawing of the Tank Fill and Vent lines NOT the fuel supply line.
Go to the parts book 78Z and look for Figure 12-001 Fuel Tank, Lines, and Fuel Emission System
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of David Przetycki
Sent: Monday, October 28, 2013 4:12 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fuel Smell After Refueling
Matt,
Where on the diagram does the fuel selector go?
David
On Mon, Oct 28, 2013 at 2:28 PM, Jon Payne <embrep@sbcglobal.net> wrote:
>
>
> Thanks Matt, that makes a lot of sense!
>
> When you mention "rerun both fill vent lines to the relocated T under the
> cab floor", can you please elaborate? What "T" fitting are you referring to
> and where are you suggesting the "T" fitting be relocated to?
>
> Thanks again,
> Jon
>
>
>
> "http://www.gmcmhphotos.com/photos/data/5607/Fuel_Tank_Vent_Line.png
>
>
> --
> Jon Payne
> 76 Palm Beach
> Westfield,IN
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
David M. Przetycki
The Jewelers
612-788-6000
612-782-9646 Fax
Great.Jewelers@gmail.com
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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] Fuel Smell After Refueling [message #227456 is a reply to message #227417] |
Mon, 28 October 2013 19:26 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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like this
http://www.gmcpc.org/archive/3rd_fuel_tank.pdf
go to picture 12
but prob is usually a crushed hose from the sender
On Mon, Oct 28, 2013 at 2:54 PM, Rob Mueller <robmueller@iinet.net.au>wrote:
> David,
>
> No place, that is a drawing of the Tank Fill and Vent lines NOT the fuel
> supply line.
>
> Go to the parts book 78Z and look for Figure 12-001 Fuel Tank, Lines, and
> Fuel Emission System
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org [mailto:
> gmclist-bounces@temp.gmcnet.org] On Behalf Of David Przetycki
> Sent: Monday, October 28, 2013 4:12 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Fuel Smell After Refueling
>
> Matt,
>
> Where on the diagram does the fuel selector go?
>
> David
>
>
> On Mon, Oct 28, 2013 at 2:28 PM, Jon Payne <embrep@sbcglobal.net> wrote:
>
> >
> >
> > Thanks Matt, that makes a lot of sense!
> >
> > When you mention "rerun both fill vent lines to the relocated T under the
> > cab floor", can you please elaborate? What "T" fitting are you referring
> to
> > and where are you suggesting the "T" fitting be relocated to?
> >
> > Thanks again,
> > Jon
> >
> >
> >
> > "http://www.gmcmhphotos.com/photos/data/5607/Fuel_Tank_Vent_Line.png
> >
> >
> > --
> > Jon Payne
> > 76 Palm Beach
> > Westfield,IN
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> David M. Przetycki
> The Jewelers
>
> 612-788-6000
> 612-782-9646 Fax
>
> Great.Jewelers@gmail.com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
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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: Fuel Smell After Refueling [message #227490 is a reply to message #227368] |
Mon, 28 October 2013 21:40 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| Jon Payne wrote on Mon, 28 October 2013 11:23 |
Guys,
Recently I starting to notice a fuel smell next to the drivers seat after refueling. It dissipates soon after I start driving. This happens regardless of the quantity of fuel I have added. In fact I just added about 10 gallons this weekend and the smell was present.
Since the fuel smell completely dissipate shortly after refueling I think I can rule out the fuel leaking inside the coach (where the fuel tube passes through).
Has anyone experienced this situation on their coach? What are the possible causes?
|
Although you don't want to take chances, fuel smells in GMC's are not all that unusual and can happen even with no obvious leaks. Sometimes the charcoal cannister can overload, and sometimes, driving with the vent window open can exagerate smells after filling, The cap on most units is vented and some vent more easily than others.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Fuel Smell After Refueling [message #227539 is a reply to message #227490] |
Tue, 29 October 2013 07:21 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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If there is a fuel smell in the coach, there is a problem-- no doubt. Yes, could be the canister spilling over but the canister should neve3r have to deal with raw fuel-- the vapor seperator is not working properly. There are new ones available thru us or Jum K. . If this smell is happening, chances are the fuel delivery system is deteriorating and this is the first sign of problems beginning to hasppen. If this is true, is it proper thought to only repair the part that has finally failed? What about the rest of the system that is also far along in it's 1/2 life as well. I really feel you should completed renew the fuel delivery system. From there you can now pay attention to the fiftymillion other possible age issues in the coach.
Fix it for today and it will fail again tomorrow. Renew the system and worry about something else...
Jim Bounds
----------------------
On Monday, October 28, 2013 10:59 PM, Bob de Kruyff <NEXT2POOL@AOL.COM> wrote:
Jon Payne wrote on Mon, 28 October 2013 11:23
> Guys,
>
> Recently I starting to notice a fuel smell next to the drivers seat after refueling. It dissipates soon after I start driving. This happens regardless of the quantity of fuel I have added. In fact I just added about 10 gallons this weekend and the smell was present.
>
> Since the fuel smell completely dissipate shortly after refueling I think I can rule out the fuel leaking inside the coach (where the fuel tube passes through).
>
> Has anyone experienced this situation on their coach? What are the possible causes?
Although you don't want to take chances, fuel smells in GMC's are not all that unusual and can happen even with no obvious leaks. Sometimes the charcoal cannister can overload, and sometimes, driving with the vent window open can exagerate smells after filling, The cap on most units is vented and some vent more easily than others.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Fuel Smell After Refueling [message #227567 is a reply to message #227368] |
Tue, 29 October 2013 10:39 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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I used to have a fuel smell when I'd stop for gas as well. This was caused by two separate things, one associated with the fuel lines, and one not.
First was the (rather obvious) leak in the vent system line that would spill gas all over the ground if I filled up more than about 2/3rds full. Dropped the tanks, found the culprit (one 8" section of line that hadn't been replaced when the PO changed all the other lines). Now I can fill up the tanks at full flow without drama.
The second was actually just a slight leak from the carburetor. It appears the top plate on my Holley carb was a little loose, so stopping (with the engine good and warm) was enough to boil a little gas out. I noticed signs of gas staining around the top plate, so I just snugged down the four (IIRC) screws and no more gas smell.
And yes, there is always SOME gas smell, given the normal venting that occurs. But it's always a good idea to chase down anything unusual before it causes problems.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: Fuel Smell After Refueling [message #227581 is a reply to message #227567] |
Tue, 29 October 2013 11:35 |
Jon payne
Messages: 495
Registered: May 2008
Karma: 1
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Senior Member |
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Thanks everyone. I have already planned to drop the tanks this coming spring. I plan on replacing the all the lines and canister and now I will make sure that I replace the vent line up to the filler neck.
Thanks again!
Jon
Jon Payne
76 Palm Beach
Westfield,IN
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