Gas Tank Vacuum
Seems like there's a lot more vacuum then normal
when removing the gas cap? 1990 w/40k miles
No codes, runs fine. Always has passed emissions where they check
gas cap as part of check.
Fuel level in tank makes no difference.
None of the hoses/wiring etc have ever been messed with.
Just replaced fuel pumps, but it did this previously.
Gas cap?
Evap cannister solenoid valve?
Imagination?
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