Finally found the right gas cap for my 2004 GMC Sierra Denali QS. This is not a "thread" type cap but, for lack of a better term, a "click" type cap. Within 10 miles of installation my check engine light went out and there were no more "Tighten gas cap" messages or CEL codes. Note: The previous (fake) gas cap was also purchased from Revain and the fitting instructions claimed it would work. So please be careful before ordering.
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