i have a 1991 ford f150 4.9 5 speed

Asked by May 13, 2014 at 09:25 PM about the Ford F-150

Question type: Maintenance & Repair

the fuel pump stays on for a long period of time before start and at steady or low rpms it
sputters but you can throttle thru and runs fine. after driving for long period high idle.
have replaced every electric component, wires , plugs, cap, rotor, o2 censor, you name
it I have replaced it. what next

3 Answers

Check out: http://blog.chiltondiy.com/2012/05/how-to-tell-if-your-fuel- pump-needs-replacing/ I am a newbie at this & ever problem is seeming like a feul pump problem... That's what yours sound like to me. That website is a great troubleshooting guide

95

Might be fuel pressure regulator, Just because you say the pump runs to long, the regulator does so by creating a back pressure since it is located at the beginning of the fuel return line. usually! could also be a leak in your lines.the other thing to check is vacuum lines fuel pressure reg. is controlled by vacuum so a leak in the vacume lines could also affect this

95

I forgot the other obvious one is fuel filter, has that been changed?

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