Leaking Gas as Cap - Third Generation F-Body Message Boards

gwrichard · 07-31-2009, 10:29 AM

I have a 1986 Pontiac Firebird with the 2.8 V6. I have had the gas tank replaced hoping to have the problem rectified, yet no avail. I have gone through 4 gas caps and all have leaked. An interesting problem I noted is that the threats on the aftermarket caps are too deep and have to be trimmed in order to fit the treads on the filler neck.

I have lessened the amount of gas leaking by using non-gas soluble liquid gasket on the gas cap, yet the car still consistently leaks with a 3/4 full or higher tank of gas when making right turns and accelerating at anything more than a snails pace.

Have any other owners run into this and if so how was it corrected?

Thanks,
Greg

87_Injected · 07-31-2009, 04:51 PM

You must have the wrong gas cap on the car then.

LarryL · 08-02-2009, 08:03 PM

I have the same problem on my 84 TA. I have tried gas caps from dealer and no help. I really don't want to change the tank and it still have same problem.
I have owned this car since 1991.

1ATony · 08-03-2009, 11:44 AM

Quote:

Originally Posted by gwrichard

I have a 1986 Pontiac Firebird with the 2.8 V6. I have had the gas tank replaced hoping to have the problem rectified, yet no avail. I have gone through 4 gas caps and all have leaked. An interesting problem I noted is that the threats on the aftermarket caps are too deep and have to be trimmed in order to fit the treads on the filler neck.

I have lessened the amount of gas leaking by using non-gas soluble liquid gasket on the gas cap, yet the car still consistently leaks with a 3/4 full or higher tank of gas when making right turns and accelerating at anything more than a snails pace.

Have any other owners run into this and if so how was it corrected?

Thanks,
Greg

Is the little flap in the fuel filler tube intact.That should keep most of it from sloshing out.

LarryL · 08-03-2009, 12:51 PM

YES the flap is there.