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Topic: Gas Fumes

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Gas Fumes (1/5)
11/19/12 1:49pm

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

I had my '79 out yesterday and noticed the odor of gas fumes.

It seemed like the odor increased as I drove the car harder, like when the secondaries kicked in. I got on it a few times and definitely noticed an increase of the gas fumes odor.

No obvious leaks or puddles under the car after I parked it. Any ideas?

P.S. It has the Q-Jet which was rebuilt a few years ago and the gas tank is pretty close to full.

Kevin

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Re: Gas Fumes (2/5)
11/19/12 6:39pm

tonytheroofer
Former Member
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Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95

After it is driven hard and you smell gas how well does it start up ? Also is the vent line hooked up to the canister in the front driver side fender ? Did you lose the gas cap ?

______________
1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI

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Re: Gas Fumes (3/5)
11/19/12 11:46pm

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

No starting or re-starting issues after the fumes get going. It runs just as good as ever.

The gas cap is on good and tight.

I'll have to look and see about the vent line. I'll let you know.

Thanks.

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Re: Gas Fumes (4/5)
11/20/12 8:33am

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: 20128

KDADDY79 said:No obvious leaks or puddles under the car after I parked it. Any ideas?

How about on the intake manifold? Any staining there?
Check the rubber lines from the carb to the vapor canister on the driver side lower fender. Also check the hoses on the tank, both side. A leak there may not show on the floor, as the fuel might evaporate before dripping to the ground.

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Joel Adams
C3VR Lifetime Member #56
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Re: Gas Fumes (5/5)
11/21/12 10:15pm

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

I think I got it fixed.

The large nut that holds the fuel line to the carb. was loose. I tightened it down and it seems good. I think it went loose on me once before but I did'nt recall.

Thanks for the suggestions on the vapor lines to the cannister in the fender. Gives me another place to look should the fumes return.

Kevin

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