Question about 1991 Ford Mustang

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91 ford mustang 5.0 fuel pump and relay is working but the pump is not getting power

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  • Richard Scordino May 11, 2010

    I may be wrong but I think you may have two pump relays.

  • Bryan May 11, 2010

    Have you checked the fuel pump enertia switch located in the trunk/hatch area on the left side? A red button on top of switch, if up ,press it down to reset.

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  • Ford Master
  • 6,826 Answers

How do you know the fuel pump is not getting power?.The fuel pump only comes on for a second or two before cutting back off.The ecm only suppys power to the relay for a few short seconds with key in the on position.Only constant 12 volts is supplied when the engine is running.Is the fuel pump new?How do we know it is good?Also is the engine giving a spark when the engine is turning over?If the engine has no spark,then the pick up coil could be bad,otr the ignition module could be bad.Check the fuel at the injsctors or a fuel line to see if the fuel will pump out when the key is turned on,if it does not,then check to see if the ijectors are pulsing.If the injectors are not pulsing ,and you have spark,then remove the distributor and replace the pick up coil,and the ignition module.The pick up coil,along with the igniyion module give the injectors there pulse.One other thing,If the fuel pump is not for sure coming on,check to see if the relay is clicking on,and then off in a couple of seconds.If this is true,then replace the fuel pump.Any other questons,please ask,I will try to help if I can.I hope this was some help,let me know,thanks.

Posted on Oct 01, 2009

Testimonial: "The car runs so I know it's getting spark and the car stays running with no problem fuel pump putting correct psi but it wrks when I put power 2 it"

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Oct 04, 2009

    Have you checked the fuel pump enertia switch located in the trunk/hatch area on the left side? A red button on top of switch, if up ,press it down to reset,this sounds like the problem

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Posted on Jan 02, 2017

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SOURCE: Power to fuel pump on 91 ford mustang cobra 5.0

The ignition module sends a "pip" signal to turn on the fuel pump and keep it running. If the signal is lost, or not present you get no pump. This is a safety in case of accident or other hazard in order to shut off the fuel so it wont keep pumping into a car with the key still on but engine disabled for some reason. Take the module to your local parts store and have it tested, for free to check.

Posted on Sep 30, 2009

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