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Ford F-Series Fuel Pump/Fuel System

scubarashscubarash Posts: 4
edited December 2013 in Ford
I have a 1990 ford f150 6cyl in which i have changed the fuel filter, both fuel pumps(have duel tanks), and i am still having a fuel pumping problem. The pumps pump for a long time before shutting off. The truck will not start until they shut off. Have checked the fuel lines fuel is pumping throught the fuel filter and also into the injectors and fuel is also returning back to its proper tank. Any ideas on what to replace now?


  • I am having the same trouble with my 1991 6 cyl. I have changed the fuel filter and the fuel pressure regulator -- no help. I'm beginning to think it is electrical. Have you discovered the cause yet on yor 1990?
  • I have a '94 F-150, extended cab, with a 4.9Litre straight six, overdrive tranny, dual tanks, and all of a sudden when I try and start it the pumps won't run to load for starting. I have checked the fuse box under the hood on the driver side and one of the yellow 20 amp fuses blows every time I turn the key. Could this have anything to do with it not cranking? I have no clue to what the fuse controls. Plus there are four or five black, 1" square fuses in this box also that I cannot tell if they are blown or not. I really need help here as this is our work truck and "no truck-no work" which means "no work-no money".
  • jnealjneal Posts: 247
    The blown fuse would have EVERYTHING to do with it not cranking. The fuse box should be labeled as to what circuit that fuse protects. If not, then your owners manual should show you. Find and repair the problem with that circuit and your vehicle should run once again.
  • I am having the same problem with my 1992. Did you get it figured out?
  • Yes, I did. It was the EEC.

    I'd read many times that the problem is hardly ever in the engine control computer, so I kept looking elsewhere. I finally got to the point that it could possibly be the computer.

    I took the computer out, opened the covers and found some burnt and disconnected leads on 2 of the components -- two capacitors actually. I bought another box from O'Reilly's, plugged it in and it started right up.

    Hope I helped. Let me know
  • gedalsgedals Posts: 4
    what was the final solution?
  • gedalsgedals Posts: 4
    what was the final solution??
  • The EEC was bad. I bought a new one, installed it, and the problem was solved.
  • I replaced the EEC and that took care of it.
  • stan58stan58 Posts: 9
    I can't find a high pressure pump on my 1990 302.
    can you help?
  • steve1doggsteve1dogg Posts: 7
    My 91 Ford F150 has a 4.9 inline six and only has one fuel pump inside the gas tank. Sorry.
  • 0patience0patience Oregon CoastPosts: 1,712
    Steve is correct.
    Gas engines have one pump. In the fuel tank.
  • stan58stan58 Posts: 9
    just for info: the 90 f150 has feul pumps in tanks. the 87,88 & 89 have low pressure pumps in tanks and a high pressure pump on the side rail. might come in handy.stan58
  • steve1doggsteve1dogg Posts: 7
    My 91 F150 has a pump in each tank, but none on the side rail.
  • I've got a 1990 F-150, 300 Straight Six, with dual tanks. I've been having a problem with the rear tank,for some reason it doesn't pressurize the system. The pump was replaced,and it worked for a time, but shortly afterward I had the same problem. I'mbeginning to think it's a wiring problem. Any ideas?
  • stan58stan58 Posts: 9
    Wish I could help but would only guess.
    I don't think wiring would keep pump from holding pressure, would look at fuel lines for leaks first.
    again just a guess, Good luck
  • lrj78lrj78 Posts: 5
    Hi. I have to depress the gas pedal when engine is warm to start the vehicle. Will not start if i don't. Black smoke comes from exhaust. Anyone know what the problem might be? thanks richard
  • gg0903gg0903 Posts: 1
    The motor which is a 5.8 liter gasoline
    won't run unless you feather the gas pedal. I changed the fuel pump and gas filter. It has
    30 pounds of fuel pressure when cranking the engine. My question is, why won't the
    engine start and stay running. Fuel regulator vacuum hose is dry. (it's not leaking).

    Please reply. Thanks for the help
    [email protected]
  • I would bet it is the EGR and is the check eng. light on?
  • I bought a Ford F150 (1990)used. The back gas tank is no good. I want to remove it anyway, but when I do I can't get the lines run so there's no leak. Is there any way to do this with plastic lines without replacing the whole gas line system?
  • My problem is that during driving, the truck acts like it runs out of fuel. Tank has gas. let the truck sit usually over night, and it will start. I have change the fuel filter many times, also pick up pumps and HP pump, no junk in tank. any ideas
  • Does your check engine light come on when that occurs? If you shut your truck off after that and then turn the ignition key to ON does the fuel pump not run for a short time like it should?

    The symptoms you described and the things I listed describes how my truck acted. Talking to people and reading up on it pointed me to not consider the ECM box -- that the ECM box hardly ever goes bad, but, after running into many deadends I eventually got a rebuilt ECM from O'Reilly's and it has been running like a top -- again.

    Not saying that is what you are dealing with -- just want you to keep your mind open to that possibility. God luck.
  • The rear fuel pump just doesn't come on.
  • i have a 1995 ford F150. the front fuel tank pump died and i want to remove the fuel from that tank. i bought a self priming transfer pump but i can't seem to get it working. does the tank have a stopper or what am i donig wrong?
  • Hello, I have a 1989 F150 with the straight 6 engine that has over 260,000 miles on it. The truck has always run well but I'm now having a problem with what I think is the fuel system. The truck will sometimes stall and run rough like it is running out of gas, and eventually quit. If I sit for about an hour, I can get it running again and it will run fine for a few days, then the problem repeats itself. I've replaced the fuel filter a couple of times and a mechanic has checked the fuel system pressure, but is unable to diagnose the problem. I'm not comfortable driving the truck now and would like some suggestions from anyone out there as to what the problem may be. Thanks, Mike
  • Your Ford runs on 30-40 psi of fuel pressure. Using rubber fuel hose and clamps would be fine. Using the plastic lines is only safe if it is mounted on the inside of the chassi rail to protect it. Good Luck.
  • I have the hard plastic gas line and front tank connection went bad. The part is discontinued so can anyone tell me how to blank off the line so the truck will run on rear tank. I have tried plugging the line and clamping it to no avail. Thanks
  • You din't specify year make or model but it doesn't really matter, Fords are pretty similar. First your only dealing with about 30-35-40psi of fuel pressure.

    Depending where the line broke depends how to do the fix. Autozone sells a mending kit for those lines that come with the new quick connect ect. If the line is damged or leaking, the easier fix would be to repair that section. If it is a return line, you can also bypass the first tank all together with a sutible size tee, rubber fuel line and clamps. If you choose to do the bypass, just make sure your splicing into the same type of fuel line on the other tank..,return or outlet. If you specify where exactly the line broke, or if it is the tank fitting itself, and more info on the type of vehicle and fuel system, such as does it have a selector valve ect. Any way hope this helped, good luck.
  • The truck is a 1990 F150 extened cab. The break is at the front tank quick connect. There is a y in the line about 12 inches from the break and it travels back to the front the rear tank. The front tank has never worked so I just need to cap that line that used to go to the quick connect at tront tank. Thanks for the help.
  • Thanks for explaining it better. My recomendation is to buy the repair kit that will put a new quick connect end on the broken line. Then either reconnect it to the tank, or put a fuel filter on the end of the new quick connector. This will allow you to put a large vaccum cap and clamp on the other end of the filter to cap it off and keep it from leaking. This will also make it easier in the future if you decide to reuse that fuel tank and some point. Good luck with it.
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