89 f150 5.0 fuel problems

Kevin Hawk

Asked by Jul 26, 2016 at 11:07 PM about the 1989 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

I bought a 89 f150 cheap from a dealership had no
problems for 6 months, then all of the sudden it broke
down on the highway I was pushing the gas and it was
slowing down when I pressed it. I've replaced the fuel
injectors, fuel filter, rear fuel tank, fuel pump, all relays, new
spark plugs and wires, timing chain and the motor still isn't
getting fuel. My diagnostic tester bit the dust recently and
can't figure it out. Don't really wanna buy a new tester,
could reall

6 Answers


If it is fuel injected, did you check the pressure with a gauge at the rail? If the pressure at the rail is low or non existent, check backward.


My husband's '91 turned out to be the "brain".

Kevin Hawk

There's no pressure at all coming from the fuel pump, I might have to check the brain


You'll need electronic equipment to check the PCM. Check for power to the fuel pump with key on.

1 out of 1 people think this is helpful.

Ford have had numerous problems with their dual fuel tank switches so if you have dual tanks, check that out. Otherwise maybe the PCM but you'll need a code reader or scanner to check that. Good Luck, Kenny/MrBlueOval


If you are getting zero pressure from the pump, check and see if voltage is being supplied to it.

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