Question about 2002 Ford Mustang

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I have a 2002 ford mustang we put a new fuel pump in the car, thinking it didnt start because of the fuel pump, but it still doesn't work. And we get power to the fuel pump. Do u know whats wrong?

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  • betodlo_87 Jan 04, 2011

    We have a 2002 Ford Mustang 3.8 Liter automatic transmission with 146,000 miles. We checked the ignition system and we are getting good spark. We replaced the fuel pump thinking it was the fuel pump and its still not working. We have good power to the fuel pump but its not pumping fuel. Could it be the fuel pump driver module? Are we getting charged again for this question?

  • betodlo_87 Jan 04, 2011

    The positive and negative wire from the fuel pump run to the fuel pump driver module the positive wire is brown and pink, the negative is red and black. The negative wire does not directly go to the body or chassi ground it goes to the driver module, and it is hot too. Could it be the Fuel Pump Driver Module? And we checked the fuel pressure with a gage no pressure to the fuel rail. And the fuel line didn't get pinched when we put the tank back in. Also the wires didn't get crossed when we put the fuel pump in.

  • betodlo_87 Jan 04, 2011

    Ok if both wires are still hot when cranking whats the next step? And if one goes off when cranking is it possible its the fuel pump driver module? And if it is the fuel pump driver module do you know how much they cost? There are six wires that come off the driver module. The pink one goes to the inertia fuel shut-off switch, the black to ground, the red and black, brown and pink go to the fuel pump, the white and red, blue and orange I don't know where they go to. Can you tell us where they go?

  • betodlo_87 Jan 04, 2011

    Thank you very much for your help we appreciate it a lot. You answered all of our questions.

  • philipstokes
    philipstokes Nov 25, 2012

    do you stell have that fuel pump ?

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  • Master
  • 1,168 Answers

Hello Betodlo.

As a mechanic in order to fix a problem we need to diagnose it to begin.
We need facts and clues in order to proceed.
First steps are to find out if there is spark and fuel pressure.
The easiest thing to begin is checking for spark at the spark plug.
If no spark then you need to find out why. Too long of a list of problems that can cause this with out you making some checks first. Ignition coils, spark plugs, numerous sensors, wiring, switches, solenoids, fuses.....and on and on.
Was the check engine light on? If so it will need to be scanned to find out what is causing the light to come on. This may lead you to the source of the problem too.
Just because the fuel pump runs doesn't mean you will have proper pressures. It needs to be tested by a gauge hooked up to the fuel pressure test port.If the pressure is none or low, that will need to be repaired. Pinched fuel lines, plugged fuel filters, bad wiring connections
And then to the engine itself. Has an internal component broken? Timing chain skipped?

I'm not trying to scare you from doing this. Just trying to explain that as a person trying to help we need some basics before we can even begin to guess, and I don't like to guess, I like to be sure of what is needed to fix the vehicle.

Begin by telling us what the Mustang is equipped with...engine size, transmission (auto or manual), how many miles on it, has it been maintained, driven hard?
The more information you give the easier it is to pin it down.

Thank you for using FixYa.

KL

Posted on Jan 03, 2011

  • 2 more comments 
  • FUBAR Jan 04, 2011

    We have a 2002 Ford Mustang 3.8 Liter automatic transmission with
    146,000 miles. We checked the ignition system and we are getting good
    spark. We replaced the fuel pump thinking it was the fuel pump and its
    still not working. We have good power to the fuel pump but its not
    pumping fuel. Could it be the fuel pump driver module? Are we getting
    charged again for this question?

    No, you are not getting charged again.
    If you have proper voltage and good connections to the pump and it is new it should pump fuel.
    A voltmeter is not a good way to test these connections. A poor connection will run a voltmeter but not a pump. And are you sure that the ground circuit from the pump to ground is good?
    Find a headlamp bulb and hook it to the fuel pump wires. It should light the bulb. This is a better test.
    Can you hear the pump run when the key is turned on for a couple of seconds?
    When you changed the pump did you hook up the wires in the proper polarity? They will not pump if wires crossed.
    Also you need to make sure the hoses are tight on the pump to hangar assembly.
    How do you know it isn't pumping fuel?
    Have you checked at the fuel injector rail for pressure?
    Are you sure that a fuel line did not get crossed or pinched when reinstalling the tank?

    OK, there are a few tips to check.
    Let me know if you need more assistance---No charge.

    KL

  • FUBAR Jan 04, 2011

    OK, both are hot when key is on. Have you checked if one turns off when cranking? If it does this would indicate the driver module has grounded the circuit.
    Also check the black wire on the driver module to confirm it is grounding.
    I have had to replace some driver modules on the pickup trucks due to corrosion.
    I believe the one on the Mustang is mounted in the trunk on the left side.

  • FUBAR Jan 04, 2011

    Did a little more digging, just in case you need it.
    Lt blue from driver goes to pin 40 on ECM.
    Wht/red goes to pin 80 on ECM
    Pink/blk goes to inertia switch and is powered by fuel pump relay when energized.
    And of course the rest you know.

  • FUBAR Jan 04, 2011

    Did a little more digging, just in case you need it.
    Lt blue from driver goes to pin 40 on ECM.
    Wht/red goes to pin 80 on ECM
    Pink/blk goes to inertia switch and is powered by fuel pump relay when energized.
    Black is ground.
    And of course the other two are to the fuel pump.

    Ok, the two are energized to the fuel pump, that's good, it proves continuity through the circuit.
    But...one of those two should turn into a ground when the fuel pump is commanded on.
    My diagram does not tell me which one is supposed to ground to complete the circuit.
    If you have checked the ground circuit and confirmed the power supply it then becomes a driver module or the ECU which controls the driver to turn on or off.
    It may be a good idea to have someone with a scan tool to check out the circuits. A scanner with good capabilities should be able to command the driver on and off.
    I am in Canada so the parts here are usually a few more dollars than in the USA.
    I believe the last one I installed on a pick truck was around $160 here.

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