Gas Fumes
Thread Starter
3rd Gear
Joined: Aug 2012
Posts: 3
Likes: 0
Gas Fumes
I have a 1979 corvette, and it is putting off gas fumes sitting in the garage, which is getting into the house. I have checked all fuel lines, new gas cap, new fuel filter, have checked around the fuel pump for leaks and none. Any ideas on what else to do.
Burning Brakes
Joined: Apr 2011
Posts: 975
Likes: 108
From: Phoenix, AZ
check
The day I brought home the car, the gasoline fumes coming from my vette were dangerous and forced me to park it outside. Spotted a teaspoon sized pool of gas inside one of the intake manifold wells. Another CF member suggested placing a small piece of brown paper bag in the well around the base of the carb for easier detection. Great idea.
Had my carb rebuilt and undid Bubba's fuel line "fix" and now the gararge is odor free.
Had my carb rebuilt and undid Bubba's fuel line "fix" and now the gararge is odor free.
Racer
Joined: Sep 2009
Posts: 315
Likes: 0
From: Washington
fuel fumes when parked
My '69 was doing that and was very noticeable when I parked it in the garage. Holley spread bore on stock manifold. Turned out the fuel pressure was to high and there was also no external float adjustment on the Holley. Put two external adjustable fuel bowls on the carb and also installed a fuel pressure regulator with gauge. Pressure was at about 11# out of the pump. Now have it at about 5# and no more fuel smell.
Racer
Joined: Feb 2010
Posts: 371
Likes: 65
From: south wilmington il.
if its a quadrajet the bowls would leak down after sitting a while there is a fix but the carb has to come off.i think they are called well plugs and they leak.also i think your gas cap is a vented cap which means vapors come out by the fill door.at least mine does and i bought a new vented cap with a new gasket and seemed to take care of the problem.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
if its a quadrajet the bowls would leak down after sitting a while there is a fix but the carb has to come off.i think they are called well plugs and they leak.also i think your gas cap is a vented cap which means vapors come out by the fill door.at least mine does and i bought a new vented cap with a new gasket and seemed to take care of the problem.
To test this condition, take the carb off the car, mount it on some sockets and put some paper underneath. If the paper is moist after a night on the bench, you have a leaking plug. (make sure the bowls are wet).
Short of that, a leaking plug condition would likely cause the quadrajet to have major starting problems as the engine would be flooded from the gas in the bowls falling out.
It's unlikely this is the gas smell - more likely that it's from the charcoal canister as mentioned, a poor sealing gas cap, or other leak.
