Question about 1999 GMC Denali

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Fuel/gas cap my check engine light is on and every time I get it checked out it reads I ned a new fuel cap at times I do smell gas.

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  • Anonymous Mar 12, 2014

    gas cap replacement 2004 xuv check engine lite 4 times ??

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  • 48 Answers

Have you replaced the gas cap? most of the time when a check engine light is on for the gas cap, its because the cap isnt venting the fumes properly or the cap isnt on tight enough.

Posted on Jul 16, 2008

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Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.

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As for the check engine light, you may have a bad gas cap... believe it or not a gas cap that doesn't seal properly will throw the check engine light. If you get the codes read (for free) at an Autozone or similar parts store it will likely read "evap system" as the problem, which will likely end up being the gas cap.
Take your car to a service center that does a true "flush and fill" of your a/c system. Those little canisters will just waste your money, and they never truly clean and re-lubricate the system like a flush and fill will do.

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