gas cap - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-28-2006, 08:40 AM   #11
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Quote:
Originally Posted by BillBoost37
As Mark said, the tank should not be pressurized. only the fuel line is pressurized.

I would look to the venting system and wonder. Do you overfill your tank? Fuel in the evap lines and canister might lead to this type of condition.
what would you consider overfill? i run my car really low and i try to get 18 gallons in every fillup.
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Old 03-28-2006, 08:50 AM   #12
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If you fill the fill tube up as the instructions clearly say not to do. That'* overfilling.
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Old 03-28-2006, 12:21 PM   #13
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Quote:
what would you consider overfill? i run my car really low and i try to get 18 gallons in every fillup.
Doing that will damage your fuel pump............
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Old 03-28-2006, 12:32 PM   #14
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The first/easiest thing I would check is to see of the filler overflow is plugged (at the bottom of the filler, there should be n overflow, with some hose going down to the fenderwell area)

That'* the first thing that pops into my head that might prevent air from getting into the tank. If this were plugged, when the pump sucks gas out of the tank, air wouldn't be able to seep in to equalize the prssure.
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Old 03-28-2006, 01:24 PM   #15
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Quote:
Originally Posted by MOS95B
The first/easiest thing I would check is to see of the filler overflow is plugged (at the bottom of the filler, there should be n overflow, with some hose going down to the fenderwell area)

That'* the first thing that pops into my head that might prevent air from getting into the tank. If this were plugged, when the pump sucks gas out of the tank, air wouldn't be able to seep in to equalize the prssure.
Good call MOS! I agree with that check. Not that anyone needs me too...just seconding that piece of advice.
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Old 03-28-2006, 01:35 PM   #16
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Actually...don't the gas caps do that these days?
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Old 03-28-2006, 04:56 PM   #17
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its has paositive preesure inside the tank not negative
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Old 03-28-2006, 05:01 PM   #18
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Quote:
Originally Posted by BillBoost37
Actually...don't the gas caps do that these days?
I thought that the caps where vented to allow for that to happen naturally...
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Old 03-28-2006, 05:19 PM   #19
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Quote:
Originally Posted by 1337ssei
its has paositive preesure inside the tank not negative
Fuel tank should be vented normally, no positive pressure. Something is clogged or the evap vent valve is shut when it should be open at the canister allowing fuel tank to press up slightly. The only pressure the fuel tank should ever see is a slight negative pressure (vacum) when the PCM runs purge routine.
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Old 03-28-2006, 10:44 PM   #20
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every once in a while in the back I can hear a poping sound I think that is the gas tank expanding and metal poping
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