89 f150 fuel pump problems

10

Asked by Mar 07, 2014 at 03:15 PM about the 1989 Ford F-150 XLT Standard Cab 4WD SB

Question type: Maintenance & Repair

I have a 89 ford f150 xlt lariat. Has a
5.0 302 v8 efi motor. The other day i
was driving and my truck just died.
Wouldn't start up again. I got home
and turned the ignition to the
"On" position and no fuel pump
sound. So i jump the fuel pump from
my battery and it runs. But won't run
when not jumped. So I replace the fuel
pump relay and eec relay. Still
nothing. I checked the inertia switch
and its not tripped. Last thing I can
think of is something in the wiring.
Need some help.

3 Answers

78,285

If you have dual fuel tanks sometimes the tank selector valve will stick between tanks and allow voltage for the fuel pumps through, Fords have a connection problem at the inertia switch itself, so double check that connection.

4 out of 4 people think this is helpful.
10

I don't have dual tanks. And I will check the connection

1 out of 1 people think this is helpful.
10

been thru this same list of problems. found that ford used two different fuel pump relays, one 4 pin and a 5 pin. wont interchange.. low fuel pressure caused buy high pressure pump failure causes same problem. runs but dies. so check fuel pressure then make sure . mine needs 40 psi to run.

1 out of 1 people think this is helpful.

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