| [GMCnet] Gas Smell [message #289698] |
Fri, 30 October 2015 09:57  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Need some input on an issue.
Whenever I stop and shut off the engine I get a bad gas smell in the
coach. It had quit for awhile and is now back. Any ideas of what I
should check??
Thanks for the help.
Ray
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Ray Erspamer
78 Royale - "The Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMCRoyale@gmail.com
414-484-9431
Web Site: http://ray-lisa.page.tl/
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Gas Smell [message #289700 is a reply to message #289698] |
Fri, 30 October 2015 10:37  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Check the flair nut to filter and filter housing to carb body for snug. The fuel line can "wind up" when tightening and then the spring action can loosen during heat and vibe cycles. I'm guessing leak near engine and fan disipates when running, worse at shut off.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Gas Smell [message #289702 is a reply to message #289699] |
Fri, 30 October 2015 10:55 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Happens on mine too, especially in the summertime. On mine, it's the fuel boiling in the carb due to that exhaust crossover. I haven't done the block off plates and new gaskets yet, and hopefully that will stop that scenario. Makes me apprehensive whenever I shut down after a decent runtime. The only way I can figure that system worked when the engines were made is to have a less volatile fuel in the carb.
Another problem that crops up here on the forum also shows up on mine if I don't follow certain behavior modifications in regard to filling the tank. Unless I am on the road and continuing on for several miles after a fill up, I must remember to fill it slower than full blast until it cuts off, and not continue to fill the tank after the first backwash cuts off the nozzle. If I pack the tank and then park the coach, it will leak fuel through the carbon canister until the fuel level drops enough, and that slow evaporation will take more than a week! If I drive the coach about 20 miles,that will drop the fuel level enough and the system works fine. So I don't fill up to the max just before getting home anymore.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
[Updated on: Fri, 30 October 2015 11:43] Report message to a moderator |
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| Re: [GMCnet] Gas Smell [message #289703 is a reply to message #289702] |
Fri, 30 October 2015 11:13 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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All good input, thanks guys.
On Fri, Oct 30, 2015 at 10:55 AM, Terry wrote:
> Happens on mine too, especially in the summertime. On mine, it's the fuel boiling in the carb due to that exhaust crossover. I haven't done the block
> off plates and new gaskets yet, and hopefully that will stop that scenario. Makes me apprehensive whenever I shut down after a decent runtime. The
> only way I can figure that system worked when the engines were made is to have a less volatile fuel in the carb.
>
> Another problem that crops up here on the forum also shows up on mine if I don't follow certain behavior modifications in regard to filling the tank.
> Unless I am on the road and continuing on for several miles after a fill up, I must remember to not continue to fill the tank after the first backwash
> cuts off the nozzle, and fill it slower than full blast until it cuts off. If I pack the tank and then park the coach, it will leak fuel through the
> carbon canister until the fuel level drops enough, and that slow evaporation will take more than a week! If I drive the coach about 20 miles,that will
> drop the fuel level enough and the system works fine. So I don't fill up to the max just before getting home anymore.
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Ray Erspamer
78 Royale - "The Great Lakes Eagle"
Center Kitchen TZE368V101144
Wauwatosa, Wisconsin 53226
Email: 78GMCRoyale@gmail.com
414-484-9431
Web Site: http://ray-lisa.page.tl/
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Gas Smell [message #289709 is a reply to message #289698] |
Fri, 30 October 2015 16:13 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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I had a persistent smell of gas when I'd stop as well, and eventually noticed some staining of the carb around the top cover. It seems that the screws just needed to be snugged down a bit, and the smell never returned. I should hasten to mention that my carb is a Holley installed by my beloved PO, though it would probably pay to look around the carb for any visual signs of gas escaping.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Gas Smell [message #289719 is a reply to message #289702] |
Fri, 30 October 2015 20:42 |
kincaid76royale
Messages: 71
Registered: February 2005
Karma: 0
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Member |
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Hi All:
I had a bad gas smell everytime I stopped. One time I found a pool of gasoline on the intake manifold. It turns out that the in-line filter holder to the carburetor had been cross-threaded at some past time and did not seal tight. A new Carburetor and a new filter holder cured the problem. So happy that our coach did not burn up!
Jack Kincaid , 76 Royale Castro Valley CA
----- Original Message -----
From: "Terry"
To: gmclist@list.gmcnet.org
Sent: Friday, October 30, 2015 8:55:52 AM
Subject: Re: [GMCnet] Gas Smell
Happens on mine too, especially in the summertime. On mine, it's the fuel boiling in the carb due to that exhaust crossover. I haven't done the block
off plates and new gaskets yet, and hopefully that will stop that scenario. Makes me apprehensive whenever I shut down after a decent runtime. The
only way I can figure that system worked when the engines were made is to have a less volatile fuel in the carb.
Another problem that crops up here on the forum also shows up on mine if I don't follow certain behavior modifications in regard to filling the tank.
Unless I am on the road and continuing on for several miles after a fill up, I must remember to not continue to fill the tank after the first backwash
cuts off the nozzle, and fill it slower than full blast until it cuts off. If I pack the tank and then park the coach, it will leak fuel through the
carbon canister until the fuel level drops enough, and that slow evaporation will take more than a week! If I drive the coach about 20 miles,that will
drop the fuel level enough and the system works fine. So I don't fill up to the max just before getting home anymore.
--
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Gas Smell [message #289721 is a reply to message #289698] |
Fri, 30 October 2015 21:16 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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Mine was a very small leak on the fuel pump. Chased it for a year. Drove the wife nuts and I didn't care for it much either.
Still have a problem if I am full when parked and get a bit off level. I've had the tanks down, checked/replaced hoses including all 3 of the fill hoses. Don't have a clue but if the left side droops a bit it smells.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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There are a host of vent / fuel lines on the left side of the coach that could cause a problem like this - on my coach, whoever had done the ethanol-friendly fuel line replacement neglected to replace one 8" piece of larger line they apparently didn't have in stock... (so I replaced ALL of it again).