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8/12/12 7:23pm - Original Message: '77 Corvette - Gasoline Fumes '
77VetteYellow
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Joined: 11/25/2006
Posts: 5
I have been having a problem with gasoline fumes comming from the carburator area after I have been driving then turning the vette off. About 5 to 10 minutes later strong gasoline fumes are present which continue for about 3 days.   I have replaced all fuel lines, gas cap, vapor canister, carburator with a rebuilt unit, fuel pump and checked all lines for any leaks. I also noticed that the inside of the intake manifold is wet with gasoline fumes after  the engine is turned off.  After the vette is shut down for about 3 days the fumes stop.  I have had the engine tuned and the compression checked and everything appears to be good.  Note: The carburator is a Rochester Quad 4. 
 
This problem has been going on for about 3 years now.  The previous 14 years that I have owned this vette there was no gasoline fumes. 
 
HELP!  Any suggestions would be appreciated.
 
Thanks
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8/12/12 7:40pm - Reply: 'Re: 77 Corvette - Gasoline Fumes '
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
You may be smelling fumes from the charcoal canister, under the driver side fender. It may be saturated with raw gas. That's one thing to check. The canister can be replaced, if needed.
Are you sure the fumes are coming from under the hood? A leak at the rear of the car will smell just as bad as one in the front. Check ALL of the lines going to/from the fuel tank, both on the driver side and passenger side of the car. The lines on the driver side are the fuel vapor lines...they go to/from the fuel tank to the canister. A leak in any of those hoses will give you a raw fuel smell, also.

If yo are seeing raw fuel puddling in the intake after shutting the engine down, your float level may be too high, or the car is getting so hot the fuel is percolating in the bowl, and running out into the intake.


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Joel Adams
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8/13/12 12:00pm - Reply: 'Re: 77 Corvette - Gasoline Fumes '
74-454 Lifetime Member
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, - Canada

Vette(s):
Coupe 74 - 454 Drive it like you stole it!

Joined: 8/6/2004
Posts: 533
I had a similar problem a couple years ago.

A shop eventually found the origin for me.  It was the fuel pump that had a very slow leak.  Not enough no have a visible part or puddle, but enough for the smell to be really strong.

You mentioned quite a few things that has been done, but my point is to not overlook them as the leak could be really slow and not have much visual traces.


With proper insurances in hand, you could trace it with a match! Wacko
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8/14/12 12:02pm - Reply: 'Re: 77 Corvette - Gasoline Fumes '
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
I would not recommend using a match !!  lol
Joel is right on the money (as usual !!)  I would bet that the cannister is loaded!!!
 
Dan the Shark Guy !!
LOL


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8/14/12 3:51pm - Reply: 'Re: 77 Corvette - Gasoline Fumes '
Jaws79 Lifetime Member
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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4211
Mine had the strong gasoline smell also and like the response above it turned out to be weeping out of the fuel pump. New fuel pump, no more smell!
 
Barry
 
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 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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