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#1
01-16-2006, 06:05 PM
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Gas Cap????
Everytime I go to fill up my car I hear a HISS as if pressure built up. I only hear it when I open the gas cap. Im assuming that some kind of ventilation is clogged. I dont know if the cap has a built in vent. or if there is some kind of tube by the filler neck. any ideas?
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2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6 
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#2
01-16-2006, 06:40 PM
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Re: Gas Cap????
Are you hearing a vacuum hiss or a pressure hiss? Vacuum in the tank is normal. Next time you hear the hiss, look for a lot of fumes coming around the cap WHILE it's hissing. If you see a lot of fumes, your EVAP system isn't functioning properly. I suspect everything is normal, however. Do you have a check engine light on?
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2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#3
01-16-2006, 06:43 PM
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Re: Gas Cap????
no check engine light is on. ever. it sounds like it could be a vaccum hiss. considering i never smelt or saw anything. but it could be that i was just too fast on it. heard the hiss and removed the cap without a second thought.
__________________
2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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#4
01-16-2006, 06:49 PM
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Re: Gas Cap????
The EVAP system pulls a vacuum on the tank for a few reasons. Mostly to keep an eye on holes in the tank and to evacuate fuel vapors. I'd say there's nothing wrong..
__________________
2007 Certified DaimlerChrysler Service Technician... True blue GM at heart.
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#5
01-16-2006, 06:52 PM
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Re: Gas Cap????
ok i just wanted to check. i thought maybe something was up because it happened like the last 3 times. but its alright i guess...next time i fill up i'll check for fumes or anything. see if its pressure or a vaccume. thnx for the help
__________________
2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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