Home » Public Forums » GMCnet » Show stopping issue/problem with gasoline fumes
| Show stopping issue/problem with gasoline fumes [message #125126] |
Sun, 08 May 2011 20:35  |
thorndike
Messages: 406
Registered: January 2011
Location: Conifer, Colorado
Karma: 0
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Senior Member |
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I didn't notice this issue while at Bean Station, probably because I had the windows and doors open most of the time.
The problem? I am getting gasoline fumes throughout the coach as it sits. I opened the door today to show my father the RV and was hit with a wall of gas fumes. I opened the door and the fantastic fan vents to air it out. After a few minutes, it was either fairly clear, or I was just used to it. The family and I are planning on using it this summer and I don't want to subject them to the fumes.
I have looked beneath the coach and don't see any wet spots, so I don't think the gasoline is leaking out. Besides, if it did, I would be surprised if the fumes would make it inside.
Is this an issue that anyone else has had? If so, where did you find the problem?
Where and how do the gas tanks vent?
Any and all thoughts will be greatly appreciated.
Bob
Robert Peesel
1976 Royale 26'
Side Dry Bath
Conifer, Colorado
[Updated on: Sun, 08 May 2011 20:35] Report message to a moderator |
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| Re: Show stopping issue/problem with gasoline fumes [message #125129 is a reply to message #125128] |
Sun, 08 May 2011 20:49  |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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Senior Member |
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Replacing the liquid/vapor separator in the driver rear wheel well might help your problem. I had a similar problem, although not when the coach was sitting. Basically if my tanks were full, and the engine was hot, I'd boil some gas. Since the liquid/vapor separator was stuck open, the vapor flowed through, condensed, and dripped out the charcoal canister under the passenger seat. Somewhere along this convoluted path, the fumes would bleed into the coach something fierce. The hotter the engine got the more liquid came out. One day I boiled the gas pretty bad and it poured out that canister when I pulled over and it condensed.
I'd imagine on a hot day in the sun, you might have a similar problem. Either way, it's a cheap and simple fix.
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: Show stopping issue/problem with gasoline fumes [message #125131 is a reply to message #125126] |
Sun, 08 May 2011 21:04 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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| thorndike wrote on Sun, 08 May 2011 21:35 |
I didn't notice this issue while at Bean Station, probably because I had the windows and doors open most of the time.
The problem? I am getting gasoline fumes throughout the coach as it sits. I opened the door today to show my father the RV and was hit with a wall of gas fumes. I opened the door and the fantastic fan vents to air it out. After a few minutes, it was either fairly clear, or I was just used to it. The family and I are planning on using it this summer and I don't want to subject them to the fumes.
I have looked beneath the coach and don't see any wet spots, so I don't think the gasoline is leaking out. Besides, if it did, I would be surprised if the fumes would make it inside.
Is this an issue that anyone else has had? If so, where did you find the problem?
Where and how do the gas tanks vent?
Any and all thoughts will be greatly appreciated.
Bob
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Bob: Under the pass seat in the engine compartment should be a charcoal canister acessed by removing the pass side inner fender liner. Under certain conditions in can fill with gas. Also maybe check the filler & vent line by removing the drivers side inner fender liner. That much fumes would about have to be coming from a large pool or the tanks and not from a feed line or carb but check them also. Also check the rubber connections from the fill line at the tanks. From there maybe the pick-ups in the top of the tanks. Removing the tanks is not hard and well within your abilities. Draining the tanks into cans with an external elec fuel pump tapped into the lines at the selector valve is about the easiest way. I would advise taking pics of every line you remove to aid in reassembly.
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Show stopping issue/problem [message #125132 is a reply to message #125126] |
Sun, 08 May 2011 21:08 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bob,
Did you fill the tanks shortly before you parked it, per most instructions?
If so, that probably compounded the problem. Just a little thermal
expansion of the gasoline could expel vapor and liquid in a number of
places.
Check manual X-7525 Pages 8-2, 8-5, & 8-6 for diagrams of the various
gasoline & vapor plumbing. It's likely that one or more of that multitude
of hose connections is leaking. Considering the overall condition of your
coach, I'd expect those hoses to have been replaced fairly recently. But,
that could be a false assumption or the ethanol could have already attacked
the rubber. Unless you can spot a leak, your best bet is to replace ALL of
the rubber hoses. That will require R&R of the fuel tanks. Not NEARLY as
bad a job as your front end work at BS. :-)
When you check the system, don't fail to check the liquid-vapor separator at
the forward end of the left rear wheel well. It's not well illustrated in
the manual, but is a frequent culprit of venting problems. It's a little
reservoir with a "ping-pong ball" controlling a needle valve. The idea is
that vapor flows from the two tanks, through the tee just below the
separator, through the needle valve, and to the charcoal cannister beneath
the passenger's feet, where it's captured until vacuumed out by the running
engine. If liquid should migrate into the separator, the ping-pong ball
should float and close the needle valve, preventing liquid from reaching the
charcoal cannister. Unfortunately, the plastic reservoir distorts and binds
the ping-pong ball, preventing it from closing (or perhaps from opening) the
needle valve -- instant problems. Either liquid can run out under the
passenger's feet, or the fuel tanks can become pressurized, causing a big
surprise when you remove the gas cap.
Good luck.
Ken H.
On Sun, May 8, 2011 at 9:35 PM, Robert Peesel <thorndike@pldsllc.com> wrote:
>
>
> I didn't notice this issue while at Bean Station, probably because I had
> the windows and doors open most of the time.
>
> The problem? I am getting gasoline fumes throughout the coach as it sits.
> I opened the door today to show my father the RV and was hit with a wall of
> gas fumes. I opened the door and the fantastic fan vents to air it out.
> After a few minutes, it was either fairly clear, or I was just used to it.
> The family and I are planning on using it this summer and I don't want to
> subject them to the fumes.
>
> I have looked beneath the coach and don't see any wet spots, so I don't
> think the gasoline is leaking out. Besides, if it did, I would be surprised
> if the fumes would make it inside.
>
> Is this an issue that anyone else has had? If so, where did you find the
> problem?
>
> Where and how do the gas tanks vent?
>
> Any and all thoughts will be greatly appreciated.
>
> Bob
> --
>
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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: Show stopping issue/problem with gasoline fumes [message #125144 is a reply to message #125126] |
Sun, 08 May 2011 23:07 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I'm wondering if you are smelling the gas boiling out of the carb. This is common on a GMC if you do not have exhaust crossover in the intake blocked. It does not take much gasoline to really smell up the place.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Show stopping issue/problem with gasoline fumes [message #125145 is a reply to message #125144] |
Sun, 08 May 2011 23:20 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| Ken Burton wrote on Sun, 08 May 2011 21:07 |
I'm wondering if you are smelling the gas boiling out of the carb. This is common on a GMC if you do not have exhaust crossover in the intake blocked. It does not take much gasoline to really smell up the place.
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Another possibility is a bad or incorrect gas cap. It SHOULD be a pressure cap. If old (or a vented type) it could vent fumes right next to your window. Especially when the tanks are full and it is hot.
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] Show stopping issue/problem [message #125160 is a reply to message #125132] |
Mon, 09 May 2011 04:44 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Bob, there is a hose that connects to the fuel filler neck, I believe that
it is 1/2" diameter, that comes from the fuel tank vents. It runs parallel
to the filler neck through the space right next to the drivers left elbow.
You can access this area by removing the inner fender on the drivers side. I
would check this area first for deteriorating hoses or loose connections.
Also check the charcoal cannister line from the cannister to the intake, as
well as the vent line that connectes it to the fuel liquid/vapor separator
in the drivers side rear wheel opening. Sounds like fuel expansion to me.
Jim Hupy
Salem, Or
78 GMC Royale 403
On Sun, May 8, 2011 at 7:08 PM, Ken Henderson <hend4800@bellsouth.net>wrote:
> Bob,
>
> Did you fill the tanks shortly before you parked it, per most instructions?
> If so, that probably compounded the problem. Just a little thermal
> expansion of the gasoline could expel vapor and liquid in a number of
> places.
>
> Check manual X-7525 Pages 8-2, 8-5, & 8-6 for diagrams of the various
> gasoline & vapor plumbing. It's likely that one or more of that multitude
> of hose connections is leaking. Considering the overall condition of your
> coach, I'd expect those hoses to have been replaced fairly recently. But,
> that could be a false assumption or the ethanol could have already attacked
> the rubber. Unless you can spot a leak, your best bet is to replace ALL of
> the rubber hoses. That will require R&R of the fuel tanks. Not NEARLY as
> bad a job as your front end work at BS. :-)
>
> When you check the system, don't fail to check the liquid-vapor separator
> at
> the forward end of the left rear wheel well. It's not well illustrated in
> the manual, but is a frequent culprit of venting problems. It's a little
> reservoir with a "ping-pong ball" controlling a needle valve. The idea is
> that vapor flows from the two tanks, through the tee just below the
> separator, through the needle valve, and to the charcoal cannister beneath
> the passenger's feet, where it's captured until vacuumed out by the running
> engine. If liquid should migrate into the separator, the ping-pong ball
> should float and close the needle valve, preventing liquid from reaching
> the
> charcoal cannister. Unfortunately, the plastic reservoir distorts and
> binds
> the ping-pong ball, preventing it from closing (or perhaps from opening)
> the
> needle valve -- instant problems. Either liquid can run out under the
> passenger's feet, or the fuel tanks can become pressurized, causing a big
> surprise when you remove the gas cap.
>
> Good luck.
>
> Ken H.
>
> On Sun, May 8, 2011 at 9:35 PM, Robert Peesel <thorndike@pldsllc.com>
> wrote:
>
> >
> >
> > I didn't notice this issue while at Bean Station, probably because I had
> > the windows and doors open most of the time.
> >
> > The problem? I am getting gasoline fumes throughout the coach as it
> sits.
> > I opened the door today to show my father the RV and was hit with a wall
> of
> > gas fumes. I opened the door and the fantastic fan vents to air it out.
> > After a few minutes, it was either fairly clear, or I was just used to
> it.
> > The family and I are planning on using it this summer and I don't want
> to
> > subject them to the fumes.
> >
> > I have looked beneath the coach and don't see any wet spots, so I don't
> > think the gasoline is leaking out. Besides, if it did, I would be
> surprised
> > if the fumes would make it inside.
> >
> > Is this an issue that anyone else has had? If so, where did you find the
> > problem?
> >
> > Where and how do the gas tanks vent?
> >
> > Any and all thoughts will be greatly appreciated.
> >
> > Bob
> > --
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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