'04 Malibu - Locking gas cap causes EVAP leak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-15-2012, 02:12 AM   #1
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Default '04 Malibu - Locking gas cap causes EVAP leak

My girlfriend told me that she replaced her 2004 Chevrolet Malibu'* gas cap with an aftermarket locking one after a few cars near her had their gas siphoned out in the middle of the night.

Since then, though, her car has constantly set the P0455 code (huge EVAP leak). I reset the code for her, but the check engine light keeps coming on.

I looked at her cap, and the thread pattern matches her factory one. I told her to take the cap back to Pep Boys and exchange it, thinking it was a bad cap, but she'* on her second one now, and the code keeps getting set. Any ideas? Can she have her locking fuel cap or not?

(If I had a tuner, I'd delete that code, but I can't, so I'm asking you guys. )
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Old 03-15-2012, 07:29 AM   #2
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you try putting the original one back on to be sure? if its the cap make sure the rubber o-ring is there like the original. if not try a different brand, i had just a walmart one on my old 03 monte and never gave me issue.
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chevy, evap system leak, evaporative emissions, fuel tank, gas, gas cap, gas tank, leak

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