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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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