what would cause my 81 ford f100 to fail pressure test

Asked by lbortoluzzi Jun 19, 2017 at 07:06 PM about the 1981 Ford F-100 Standard Cab LB

Question type: Maintenance & Repair

my truck passed all of the emissons test except pressure, also both caps failed

1 Answer

F_O_R answered 6 years ago

Gas tank pressure test? If so there is a leak somewhere. Maybe a filler neck hose but more likely a EVAP system issue.

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