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Cammie

Cammie 5/20/2010

1991 Jeep Cherokee Laredo 6 Cyl 4.00L

Preventive Maintenance

Fuel pump burnsout without any appearent reason

The fuel pump keeps burning up. Our mechanic has replaced it a couple of times already. It starts and runs fine for a mile or two after leaving the shop and then the fuel pump goes out. The mechanics that have tried to find the problem are stumped. Diagnostics say everything is fine and the pump(s) and filter are new, the lines appear to be good as well. The jeep has been at the shop for 4 weeks now and no one can figure out why this is happening?

2 Answers


Bobby

Bobby 5/20/2010

how do you know its the pump? are you checking for power to the pump when it shuts down? the relay could be acting up? pumps just don't burn out seems like something is missing the fuse would blow before a new pump would burn out. unless the pumps are just really cheap. Start testing the relay and wiring something else must be the problem.

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Bobby

Bobby 5/20/2010

also this vehicle has a ballast resistor in the fuel pump circuit find that and maybe replace or atleast test.

Bobby

Cammie 5/20/2010

The mechanic said it was the pump. When it starts the power is at 100% and then it suddenly drops and the Jeep goes dead. When he put the new fuel pump on, he drove it for about 4 miles down the road and it started acting like it was running out of gas and then it went dead and would not start again. When he installed a second new pump on, it did the samething again. He also told me that when he connected it the computer it didn't give him any codes except for the fuel pump.

Cammie

Cammie 5/20/2010

Would a faulty ballast resistor give a code if it was bad?

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