91 F250 Fuel Pump

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07-07-2014, 05:55 PM

Harold Lee

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91 F250 Fuel Pump

The pump on my 91 F250 EFI will not shut off when the truck is shut off. Any suggestions? Thanks!

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07-07-2014, 06:27 PM

rla2005

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Is this a new issue? Did it shut off in the past?

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07-07-2014, 06:29 PM

carguy94

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will the truck start. pull codes from the engine. if your fuel pump will not shut off unless their is a wiring short or something in between the EEC then that could be bad causing the pump to run all the time. do you know were the diagnostic test port is on your truck and the one in the cab.

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07-07-2014, 06:36 PM

subford

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If the key is also off you may have a stuck EEC Power or Fuel pump relay. Also check the wiring under these two relays mounted on the drivers inter fender.

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