While operating 89F150 4.9. dual tanks, pressure builds in front tank and overflows. What is the cause?

Asked by Dec 24, 2015 at 03:41 PM about the 1989 Ford F-150 S Standard Cab LB

Question type: Maintenance & Repair

Driving on front tank, pressure builds in front tank and overflows. If you try to remove filler cap it gushes out fuel.

1 Answer

6,245

The fuel pump check valve is bad and allowing the other tank to fill it up. Ford had an inline valve that installed at the outlet of the fuel pump to prevent this. The other option is to replace the pumps as assemblies.

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