Question about 1991 Ford F150

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Fuel system problems

Hey guys, any help would be much appreciated! My 91 Lariat died on me about a week ago. I knew I was low on gas (gage doesn't work) so I was carrying a full five gallon tank with me when it ran out, another foolish decision. I was trying something new as I've been having some trouble with switching between my fuel tanks. I ran the truck out, fueled up with the five, went and got another five, nothing. I did manage to get her running with the aid of some starter fluid and ran her about four miles home by continuously pumping my gas pedal, otherwise she would die if I stayed on it. Not sure what the problem could be. Replaced my fuel,filter which absolutely needed it, used compressor to blow out what I thought might be gummed up fuel lines. Both fuel pumps will turn on when key is in start position... Is this anything that y'all have ever heard of before?

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  • Ford Master
  • 6,674 Answers

Check that fuel pressure is up to specs. Should be a connection at fuel rail to attach gauge. Maybe try removing one line where they connect for feed from both tanks and plug it good. Something may have happened when blowing lines that is allowing one line feed to suck air at same time as fuel from the other. Perhaps check valve in line. Try both ways, with each line to see if problem cured. Low pressure reading would indicate that possibility. Check all fittings & connections for possible leak from being disturbed .

Posted on Mar 19, 2014

Testimonial: "Mike I really appreciate you taking some time for me! Thanks brother. Fuel pressure seems to be alright. I blew the lines out today with a compressor again, tried to make sure the lines weren't gummed up. No luck there, fuel pressure appears to be just fine and both fuel pumps are working well. I'm beginning to think that it's a problem somewhere in the engine. She's fuel injected so what are the chances that it might be somewhere in my spider gears? If that's the case, would it do any good to get some fuel injector cleaner in the tank even if I can't get the engine running? Thanks for your time!"

  • Mike Butler
    Mike Butler Mar 23, 2014

    If you have good pressure at rail, I'm having a hard time with all 8 injectors being gummed up so bad that it won't at least start and maybe run rough, missing in one or 2 cylinders. Faulty fuel pressure regulator is a possibility, but take a few minutes and test the throttle position sensor with a multimeter set on ohms. Preferably an analog, so you can watch the needle movement. Are you familiar with meter enough to do the test? WIth engine off, unplug connector from TPsensor, and touch probes on 2 of the terminals.Then move throttle (engine not on) from off to wide open slowly and watch ohm reading or needle. reading should increase as throttle increased. Might take a few tries but when you touch right combination of terminals, you'll see reading increase, and go back down as throttle is backed down. Once you find right terminals, slowly and smoothly increase throttle all the way to wide-open, and all the way back a few times and watch reading real close. It should increase and decrease smoothly as well. If it stops, then jumps up, or has any erratic movement, that will indicate a faulty sensor. Be sure to test a few times and confirm either smooth, or erratic/jumps, at same spot, or spots. Throwing that out there as one more, cost free thing to test and confirm it's working properly. Just in case the problem has nothing to do with dirt in fuel. Depending on mileage, timing etc may be another thing to confirm too.

  • Mike Butler
    Mike Butler Mar 23, 2014

    One other thing that may be useful to you, is ( autozone.com ) . Sign up, register an account for free,and you can get access to service manuals that give you step by step instructions and pictures to guide you through a lot of tests and repairs, plus you get access to parts and prices. Those manuals just may help you now and in future.

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donny_steele
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SOURCE: 1989 f250 460 engine fuel problem

if the fuel lines have any rubber fuel lines they could be sucking air. also try replacing the fuel caps, it may not be venting

Posted on Dec 02, 2013

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