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Old 07-22-2008, 04:43 PM   #1
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Fuel Pump Problem

I have been having problems with my fuel pump coming on and shutting off as it pleases. It will have fuel pressure half the time u can shut it off and it will get 15psi for about a half a second drop right down and not come back up. But if u keep trying to start it will eventually get pressure. I replaced the relay. I havent had time to fix the problem this summer cause of a hectic schedule. But will it screw up the computer to rewiring the fuel pump to run on a toggle switch inside the truck. Cause the jeep is 20 years old im gonna drop the tank and replace the pump anyway this weekend. So it would be easy to rewire it.

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Old 07-22-2008, 09:32 PM   #2
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The computer doesn't get a signal from the fuel pump. It just tells it to turn on and off. You should be fine in running it off of a switch.

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Old 07-23-2008, 10:58 AM   #3
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i have run many a fuel pumps on switchs and it has never given me a problem.
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Old 07-23-2008, 11:01 AM   #4
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You sure it's not a problem with the pump itself? Might want to test the theory before completely wiring in a switch. 14 year old pumps can go intermittant as well.
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Old 07-25-2008, 09:07 AM   #5
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Just fix whats wrong with it, don't dork it up with switched power and such. You don't need to do anything while replacing the pump other than verify that the connections on top of the tank are sound and the wires good (not cracked, etc.). I would suspect if replacing the pump does not fix the problem, that the wire from the back to the front may be frayed/chafed.

Do the pump, then before even putting the tank back, check every wire associated with operating the pump. The computer feeds the relay coil, other side of coil is prob to Ign, relay has +12 on one side and output +12 to pump on the other. Intermittents are tough to find, but walking through the whole thing will at least let you know all is visually well.
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Old 10-15-2008, 11:00 AM   #6
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What ever happened to your fuel pump problem? I now have a problem with the pump not starting when the key is switched on. Also the fuel gauge pegs to full. I have replaced the pump on my 1990 2.5 wrangler but it only temporarily fixed the problem.

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