Quote Originally Posted by tom4bren View Post
Sue,

If the stealership can't figure out what's going on then I'd suggest your next step should be another aftermarket cap. But before you start using it, drill a hole in it for a vacuum release screw (or even a Schrader valve).

Not sure if that's your problem but it's the next logical step to take.

Tom
Would that trigger a CEL because of the vapor or fumes?