1991 Ford F-150



March, 8, 2009 AT 11:45 PM

Electrical problem
1991 Ford F150 6 cyl Two Wheel Drive Manual 154235 miles

I have a 1991 ford F150 larait xlt with the 4.9L. When I switch it on the fuel pump comes on but it wont shut off. It's a duel fuel tank truck but the back tank is the only one that does this.

2 Answers



March, 8, 2009 AT 11:51 PM

Need to inspect relay. If relay is faulty it will stick causing pump to run at all times. If relay is OK, suspect faulty pump.

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March, 9, 2009 AT 12:01 AM

Thanks for the reply. I just replaced the pump in the front tank. And it literalry caught on fire. I guess the caseing on the pump was black and melted. Just tankful it didnt blow up. The pump was in a full tank of gas when it did this.

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