Question about 1993 Jeep Cherokee Country

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No fuel pump acuation

Check plug at tank no power and fuel pump relay not working has power and ground switched relays did't work could this be the ignition

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  • yadayada
    yadayada May 11, 2010

    have u tested the low oil pressure fuel pressure cutoff switch

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It may be the computer not sending a signal to the fuel pump accuator. Changed the computer in mine and I don't have a problem anymore.

Posted on Dec 06, 2009

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  • Jeep Master
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Check fuses in power distribution box and auto shutdown relay. Also attempt to code check pcm if you can...don't think there will be any codes but make sure it has power.Also check to see if you have a white ballast resistor on the driver side fender...I think that sends power back to the pump. In that fails, make sure that the wiring below the really is actually sending power out...the relay may be fine but if wiring is corroded underneath it won't help

Posted on Jul 26, 2009

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If this checks OK ( power on both sides ), you can pull the fuel pump relay, and jumper it.

The engine compartment fuse panel is where the fuel pump relay is located at ( relay # 301 ). Pull the fuse pump relay out of the socket, and using the diagram below, with the red line, momentarily jumper the Normally open contacts, you shoud hear the fuel pump run. ( mind the pin orientation when doing this ) :
86000f6.jpg

I had a bad fuel pump relay on my 2001 F-150 @ ~ 36K miles. Replaced with the trailer tow battery charge relay ( relay #302 next to it ) and it worked again.
The symptom I had was a crank no start ( theft light on dash went out ).

If the fuel pump does not run, and power is on pin #30 in the relay socket, next is to check the output of the fuel inertia switch in the passenger side kick panel. The output of this is the Pink w/ Black stripe wire. The connector to the fuel pump inertia switch should be a 2 pin connector, the other color in the connector is Dark green w/ Yellow stripe wire ( that is from the pin #87 in the relay socket in the engine compartment ).

If that circuit has power at the passenger side kick panel, next is to check for power at the fuel pump at the fuel tank. The fuel pump motor is the same Pink w/ Black stripe wire. The connector is a 4 pin connector with black ( ground for the fuel pump ) black w/ orange stripe ( ground for the fuel level ) and yellow w/ white stripe ( to the instrument cluster for the fuel gauge ).
When testing by the fuel tank, make sure you have a good ground for the meter ( extension from neg on the battery or trailer tow adapter ) as that could also be a problem under the truck.

Sorry for war and peace, hope it helps.

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