why can't I switch from front fuel tank to rear fuel tank?

Asked by Kenneth Aug 13, 2013 at 02:55 PM about the 1991 Ford F-250 2 Dr XLT Lariat 4WD Extended Cab LB

Question type: Maintenance & Repair

won't switch from front fuel tank to rear fuel tank.

4 Answers
58,625

Tracy answered 11 years ago

Typically, the selector valve on the frame just below the driver's seat has failed. I've been looking for a good aftermarket replacement for my '87 F-250 some time now but fear that I will have to bite the bullet and change out all of the OEM stuff - wiring and all.

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575

Brian answered 11 years ago

If it's diesel, it could the selector valve, the fuse or the switch on the dash. If gas, could be the fuel pump/sending unit.

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Brian answered about a year ago

Your fuel tank switch in dash has six wires red wire must be hot. And when you switch it the red power wire activated the front or rear pump. Drove me nuts. Now both tanks work properly.

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