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Old 05-06-2013, 09:41 PM
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76 pontiac F/B 350 2 brl.

Most of the time after driving the car for an hour or so and I park it back in the garage and close up shop the shop is smells like gas . I've changed EVERYTHING but the return steel line and the cannister filter and the gas tank cap . Is it poss that the fumes are not going back to the tank or ???? Thanks

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Old 05-07-2013, 12:38 PM
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Originally Posted by f/bird View Post
Most of the time after driving the car for an hour or so and I park it back in the garage and close up shop the shop is smells like gas . I've changed EVERYTHING but the return steel line and the cannister filter and the gas tank cap . Is it poss that the fumes are not going back to the tank or ???? Thanks
Could be "heat soak" boiling the fuel in the carb bowl after shutdown. Install a very thick gasket between the carb and the intake manifold to prevent engine heat from migrating up to the carb. Also check the carb float level and adjust to specs. If you still have trouble after this, tee off at the carb fuel inlet and run a 0-15 psi mechanical gauge up to the cowl area in front of the windshield so you can see the actual fuel pressure going into the carb. Carter, Edelbrock and Rochester will tolerate only about 5 psi before unloading the needle and seat and blowing raw fuel into the intake manifold. Holley carbs will tolerate about 6 psi before unloading the needle and seat.
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Old 05-07-2013, 05:08 PM
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It is fuel evaporation from the carb. Get used to it.
Or you could try getting an air cleaner/ housing from an 80 ish GM like a buick or poncho.
Look inside....some of them had a Ring or filter looking thing inside the housing that was smaller than the filter and looked like a filter. It is filled with Charcoal.....to absorb fuel vapor. TA DA.
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Old 05-07-2013, 08:00 PM
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As far as athicker gasket between the carb and intake goes , It has one of the s/steel plates . I checked with all the people that would reply and the common answer was that the plate goes on then the carb gasket . I used the one that came w/the kit! I guess Ill get used to it until some remedy comes along !! LOL
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