Fuel pump problems

Tiny
BEVERLYMSMITH
  • MEMBER
  • 1988 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have replaced 3 fuel pumps since March of 2011, last night the fuel pump would not engage, so it seems like its out again.
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Sunday, August 14th, 2011 AT 4:28 PM

3 Replies

Tiny
JDL
  • EXPERT
Are you using an oem pump? When was the last tune-up? Did you replace fuel filter when the pump was changed last? Inside the tank is clean? Any applicable trouble codes? Do you have good voltage and ground for the pump motor?
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Sunday, August 14th, 2011 AT 4:35 PM
Tiny
BEVERLYMSMITH
  • MEMBER
What is a oem pump? Yes we changed the filter last tune up was april, I don't have the electronics for trouble codes, just a single mom trying to fix her only running car. I can check the voltage and the ground.
When I first replaced the pump it was because it was whineing really loud and I was afraid the pump would go out, but saved it. After 2 new pumps went out I decieded to re-install the original one on Monday. When we did that it was running really ruff so we replaced the MAP sensor vacume lines. I also bought a new MAP sensor (not installed yet), then it was only having problems when the engine warmed up, then it would cough, spit and spudder like it couldn't get gas. Last night after my 12 hr shift I went to start it and come home but it wouldn't and I could not hear the pump engage.
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Sunday, August 14th, 2011 AT 4:48 PM
Tiny
JDL
  • EXPERT
Oem means, original equipment manufacturer. You may have to go to a jeep dealership to get an oem fuel pump. Use a gage and check fuel pressure. In the diagram below, pink wire is voltage for fuel pump motor, black wire is ground. The violet wire is the sending unit for the fuel gage.

I looked at more info on your vehicle, pre-91 it says you have to use an adapter with drb for that type diagnostics.
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Sunday, August 14th, 2011 AT 5:24 PM

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