How do I fix a slow fuel pump

Asked by sbranson Aug 19, 2015 at 05:06 PM about the 1991 Ford F-150 STD LB

Question type: Maintenance & Repair

My 1991 F-150 pickup won't start until the pump runs for 5-10 minutes and builds up
pressure enough.  It this the pump or something else?

3 Answers
65,510

firebird338 answered 9 years ago

Sound like the fuel pressure regulator or possibly a partially clogged fuel filter but more than likely it is the regulator.

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30,935

Tom answered 9 years ago

If it's the original pump then it's probably near the end of it's working life. Imagine if you had a daughter when you bought the truck, then you would more than likely be a Grandparent today

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74,270

OJ answered 9 years ago

Get a gauge and check the pressure being delivered to the regulator. Key on, engine off. Note the pressure when you initially turn the key to the on position. If it takes a while to build up pressure to spec, suspect a clogged filter or bad pump. If you suspect a regulator problem remember the regular is a mechanical device, not electric or electronic. It, by itself, does not send OBD codes, but could affect things like oxygen sensors readings which could throw a code.

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