MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

88 Comanche Fuel Pump Problems

Old 08-27-2015, 06:21 PM
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Default 88 Comanche Fuel Pump Problems

Hello Guys, I have a 88 Comanche with a 4.0 , Auto Trans, 4x4

To Begin with... The Truck Just Died on me with No Warning at all.
Was Starting and Running PERFECT up until this happened.
I can get it to start very Briefly, pumping the hell out of it but it will only run for less than 15 seconds and sounds like it's running on fumes. I believe it;s the Fuel Pump but before I yank it out I want to be sure it's not electrical. I put the key ON and pulled the plug going to the Pump to test it. Lite Orange Wire HOT, Other 2, ORANGE & BLACK, NOTHING. I assume the Black is Ground?? I Pulled the Relay out and tested the socket, HOT on 2 ONLY. Is this NORMAL? Thought of Running a Hot wire to the connector but NOT sure which wire to use and don't want to FRY something.
Any ideas or advice would be greatly appreciated. I hate to change that Pump and find out it's NOT the problem.
Thanks for the help , DanO'
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Old 08-29-2015, 09:31 AM
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Default 88 Comanche Fuel Pump Problems

Ever change the fuel filter ?

Last edited by Outlaw Star; 09-02-2015 at 07:03 PM.
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Old 09-02-2015, 08:31 PM
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Year: 1990
Model: Comanche
Engine: 4.0
Default

On the driver side inner fender is a fuel pump ballast resistor. It could have failed. Bypass it and see what happens.
Attached Thumbnails 88 Comanche Fuel Pump Problems-ballast-resistor.jpg  
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