1989 Comanche getting no fuel to motor - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-17-2004, 10:51 AM Thread Starter
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1989 Comanche getting no fuel to motor

my cousin recently picked up a 1989 Comanche with a straight six for $50, it's not getting any fuel to the motor at all, so he checked to see if there's any voltage going to the pump and he said it's a very little bit, so he pulled the pump and put power to it straight off the battery and there was no sound from the pump at all, so what do you guys think? bad pump? maybe but what about the very low voltage (not sure how low he only used one of those deals with the light to check to see if it was getting power) also, anything else that we should check? is there a relay for the pump that can go bad or something? something that could cause the low voltage? if anyone has any clues lemme know, thanks in advance!
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post #2 of (permalink) Old 06-20-2004, 11:35 PM
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Re: 1989 Comanche getting no fuel to motor

If when he hooked it up strait to power and it did not work, my guess would be a bad pump. You might want to try the Jeep mid-wheelbase board to find more answers. This board is for fullsize Jeeps.
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post #3 of (permalink) Old 07-07-2004, 02:20 AM
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Re: 1989 Comanche getting no fuel to motor

First, replace the pump. Next, buy a Volt-Ohm meter. This way, you can check the exact voltage available. Next, install the pump. Hook it up. Does it pump gas? If so, you're done. If not, check the voltage: less than 9 volts could mean bad fuel pump relay. Follow the SAME COLOR wire from the pump into the cab. The relay hooks to that wire. unplug and plug in new.

Not all FSJs have carbs. Mine has a 4.0L EFI from an '89 Cherokee Pioneer parts rig. [img]images/graemlins/scs.gif[/img]
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