LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Gas tank issues, is this normal?

Old Aug 26, 2010 | 02:19 AM
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Default Gas tank issues, is this normal?

I've been noticing this more and more lately and I just want to throw it out there and see what you guys (or gals) think. When I open my gas cap I get a LOT of vapors coming out. I know the lower you run your tank it will make that noise when you open it but this seems much more than normal. Is this something to be worried about? I would think there should be a valve or something to let excess vapors escape and stop this from happening. The idea of pressure building in my gas tank just doesnt sit very well when I decide to do some "spirited" driving. Thanks!
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Old Aug 26, 2010 | 03:08 AM
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Gas cap hissing is normal with unvented caps. From what I've found, it also varies with temperature differential. It's nothing to worry about.
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Old Aug 26, 2010 | 01:35 PM
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I use to have that same issue then I got an ls1 gas cap. Problem solved and I picked up 1/10th in the 1/4

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Old Aug 26, 2010 | 01:46 PM
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Originally Posted by GREGG 97Z
I use to have that same issue then I got an ls1 gas cap. Problem solved and I picked up 1/10th in the 1/4

Picked up a 10th from switching gas caps? May I ask, How did that help you gain 1/10th?
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Old Aug 26, 2010 | 02:15 PM
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Originally Posted by Slow94Formula
Picked up a 10th from switching gas caps? May I ask, How did that help you gain 1/10th?
HELLOOO ! Its from an LS1 Im suprised it wasnt more myself
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Old Aug 27, 2010 | 02:02 AM
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Lol, sounds good. Thanks
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