Question about Ford Crown Victoria

2 Answers

Pull off old pump and replaced found out after putting new on their was no fire to the pump it wasn't coming on .What is my problem.

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  • 8 more comments 
  • Samuel Charles Spriggs Mar 20, 2011

    Blown fuse, bad fuel pump relay, loose / damaged / dirty connectioins somewhere in circuit are possible causes. Faulty fuel pump relay is a likely cause.

    Charlie

  • djtruckin37 Mar 20, 2011

    87 ford crown vic. with 5.0

  • djtruckin37 Mar 20, 2011

    okay jeff with the switch off i got a dim and a bright with the switch off i don't have anything.

  • djtruckin37 Mar 20, 2011

    sorry jeff with switch off i got a bright and a dim light with switch on i got nothing.

  • djtruckin37 Mar 20, 2011

    Okay clip on ground switch off one dim switch on two dim.

  • djtruckin37 Mar 20, 2011

    yes first results clip was on battrey .second results clip was gronnd to frame

  • djtruckin37 Mar 21, 2011

    jeff are you still there.

  • djtruckin37 Mar 21, 2011

    clip on positive post: on nothing, off 2 bright lights. clip on ground: on 2 dim lights, off 1 dim light.

  • djtruckin37 Mar 21, 2011

    my 87 crown vic 5.o the fuel pump is not coming on. i've changed the pump,relay switch and connector.ran a test on the pump to be sure its working also put test light to switch connector to see if i was getting fire from the ignition switch.need help.

  • djtruckin37 Mar 21, 2011

    jeff i would like to finish working with you

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2 Answers

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  • Ford Master
  • 17,129 Answers

If what you meant is the fuel pump , then I would like you to confirm the following before you go further.
1.In the first place was the fuel pump of the same type and calibrated to the car specification?
If so then you must check and see if there is any fuel AIR LOCK that prevents the fuel to flow out in required pressure. You must check this or have the fuel pressure calibrated.

2. Secondly what was the reason for the fuel pump change? if this was for any poor performance then definitely there is no need of the engine to refrain from firing. Hope there is no fault in the fuel.

3. Finally make sure that the electrical system is working fine and in order. Please see that in the process of resetting a new pump there was any wires or connections that was accidentally tripped or disconnected.

Posted on Mar 21, 2011

  • Donald DCruz
    Donald DCruz Mar 21, 2011

    Please give me your comments on the voltage to the pump, if the relays were checked and if there is any dirt in the lines?

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  • Ford Master
  • 8,190 Answers

Hi, it could be a number of things, including the relay. Could you provide the model, year, and engine size so I can look up the wiring diagram?

Thanks, Jeff

Posted on Mar 20, 2011

  • 5 more comments 
  • Jeff Turcotte
    Jeff Turcotte Mar 20, 2011

    OK, you have an inertia switch--has the car been in an accident? Please check that first.

    In the event of a collision, the electrical contacts in the inertia switch open and the fuel pump automatically shuts off. The fuel pump will shut off even if the engine does not stop running. The engine, however, will stop a few seconds after the fuel pump stops. It is not possible to restart the engine until the inertia switch is manually reset. The switch is located in the luggage compartment on the left hinge support on passenger vehicles or on the left side storage compartment on station wagon models. To reset, depress both buttons on the switch at the same time. Some applications have only one button on the switch assembly.







    If that isn't it, check the fuel pump relay. The relay is probably mounted on the firewall or inner fender. It has the wire colors shown below (yellow, orange, tan, red). Use a 12 volt test light to interrogate the relay socket. Connect your test light clip to chassis ground and probe the terminal in the socket. There should be one hot terminal (yellow wire) with the key off and 2 hot terminals (yellow and red wires) with the key on. Next, move your test light clip to battery positive and probe again with the key on. There should be one terminal that lights the light brightly (tan wire) and one that lights it dimly (orange wire to pump). I'm assuming the pump is plugged into its connector. After running these checks, please get back to me with results.



  • Jeff Turcotte
    Jeff Turcotte Mar 20, 2011

    For these results, was your test light clip on the battery positive?

  • Jeff Turcotte
    Jeff Turcotte Mar 20, 2011

    sorry but I need results for both clip on positive and clip on ground.

  • Jeff Turcotte
    Jeff Turcotte Mar 21, 2011

    sorry for the delay. I'm analyzing your results...one moment

  • Jeff Turcotte
    Jeff Turcotte Mar 21, 2011

    OK, these results are confusing, but I think your computer is not turning the pump on. There may be a couple reasons for this. The usual reason is the anti-theft system, but I don't think you have one. Can you see the wires coming from the relay socket? I would like to confirm that the tan wire with a green stripe is not grounded with the key on. To doublecheck, turn the key on, put your clip to a good chassis ground, and probe the tan wire terminal. If the lite doesn't light, there is no ground, and I think you have a bad wire. An easy way to fix that is to cut the tan wire and connect it directly to the chassis. Before doing that, I would run a separate wire from a ground point to the back of the connector at the tan wire to see if the pump will come on when you turn the key on. If it does, that is the fix I recommend. I had to do that to a truck last week, because I had no idea where the wire went bad. Does this make sense?

  • Jeff Turcotte
    Jeff Turcotte Mar 21, 2011

    sorry, my bad. For the doublecheck of the tan wire, the test light clip has to be on battery positive.

  • Jeff Turcotte
    Jeff Turcotte Mar 21, 2011

    OK, good luck to you. I think you will find other experts will give you similar information. Your problem is not simple to solve, so I have had to provide complicated instructions. To correct the problem properly, it would be much more involved, so I have recommended a simple bypass of the computer. If you do not get it to work via the next expert's help, I really recommend you try jumping a ground wire to the tan wire, as I suggested.



    Thanks, Jeff

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