efi fuel system no power to all fuel pump if you jump relay hear run replace relay same

Asked by Jan 19, 2014 at 03:20 PM about the 1989 Ford F-150 S Standard Cab 4WD LB

Question type: Maintenance & Repair

truck start than cut off after check out found fuel pump not running so check out found out if you jump yellow wire that power all time to brown wire at relay  pumps come on  so replace relay  still same problem any ideal what wrong is it computer or senter

2 Answers

10

Check the tank selector switch in cab. Common for them to crap out. When it does, the whole system goes down. I had a 90 that did the same thing. Grab one or two from the junk yard and plug one in, see what happens. They are cheap so what the hell.

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2,945

make sure you check your high pressure pump on frame rail. your 89 has 3 fuel pumps,a low pressure pump in each tank that feeds the high pressure pump.

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