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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 03-27-2006, 07:00 PM   #1
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Default gas cap

every time I take it off I get this soud that is like a woosh of air and today a cloud of what ooked like gas fumes cam out after a hard drive.
is this normal?
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Old 03-27-2006, 08:19 PM   #2
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Default Re: gas cap

Quote:
Originally Posted by 1337ssei
every time I take it off I get this soud that is like a woosh of air and today a cloud of what ooked like gas fumes cam out after a hard drive.
is this normal?
No,it'* definitely not normal. Your fuel tank should be at atmosphere when removing the gas cap. Something may be flukey with the EVAP system. I assume the SES light is not illuminated? codes?
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Old 03-27-2006, 09:32 PM   #3
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no SES lights/ codes
but a few months ago I found the evap can to have a broken vaccume line I fixed
any ideas?
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Old 03-27-2006, 09:35 PM   #4
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is the woosh of air you air filter sucking in air? ill have to hear this sound next time we hang. i havent noticed it yet.
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Old 03-27-2006, 09:49 PM   #5
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no it happens when the motor is off if I go to fill up and open the lid
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Old 03-27-2006, 09:58 PM   #6
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Quote:
Originally Posted by 1337ssei
no it happens when the motor is off if I go to fill up and open the lid
ooo i mis read what u said. are you just low on gas?
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Old 03-27-2006, 10:00 PM   #7
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Default Re: gas cap

Quote:
Originally Posted by 1337ssei
every time I take it off I get this soud that is like a woosh of air and today a cloud of what ooked like gas fumes cam out after a hard drive.
is this normal?
Perfectly Normal! The system is sealed and the Whoosh you hear (and so do I) is when we unscrew the cap and the atmospheric pressure equalizes.
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Old 03-28-2006, 06:49 AM   #8
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There shouldn't be any equalization of pressure, there is no differential pressure to start with. Something doesn't appear to be right.
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Old 03-28-2006, 08:23 AM   #9
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I suggest you trace the vacuum line from the evap canister to the fuel tank for more breaks or a disconnection. On cars our age, these lines very commonly crack or split from age.

Normally though, as suggested by markwb, a break in a vac line would result in a code light.
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Old 03-28-2006, 08:38 AM   #10
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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.
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