Thread: Fuel pump related electrical issues

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  1. #1 Fuel pump related electrical issues 
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    I parked my 1995 jeep grand cherokee limited edition 5.2L 4 door when i got home and went out the next morning and it wouldn't start. I didnt notice any problems or anything out of the ordinary leading up to this. So i noticed the fuel pump wasn't turning on so i replaced the fuel pump and it still wasn't starting. Any recommendations or tips? This is my first post but please flood me with any questions or suggestions you have. Any and all help is appreciated, thank you

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  2. #2 Re: Fuel pump related electrical issues 
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    BigDaveZJ's Avatar
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    Fuel pump relay?

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  3. #3 Re: Fuel pump related electrical issues 
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    No its not the relay or fuses, i checked those

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  4. #4 Re: Fuel pump related electrical issues 
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    No i checked the relay, and fuses already. They were working fine. But i did some more testing today and found the relay wasn't getting ground

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  5. #5 Re: Fuel pump related electrical issues 
    Senior Member Ken L's Avatar
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    Hook a timing light onto any wire and see if it's getting spark while cranking. Also look at the tach while cranking. Although not a 100% answer, if it's not getting spark and the tach doesn't move while cranking, it could be the crank position sensor. Just replaced that on my '96 yesterday as it was giving me erratic no start/stalling problems.
    Ken L
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  6. #6 Re: Fuel pump related electrical issues 
    Junior Member Lifetime Supporter kg6mov's Avatar
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    IIRC the fuel pump ground is in an odd place. I'd inspect the wiring from the pump module back to the engine bay.
    1996 ZJ Green Laredo 5.9L, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
    1998 ZJ Platinum Limited 5.9, junked.
    1998 XJ 2dr 2wd, for now.
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  7. #7 Re: Fuel pump related electrical issues 
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    My 94 died on the highway and wasn't getting fuel. I got a pump and replaced it, but noticed in the process that one of the pins in the connection between the pump and vehicle harness had completely corroded away. I just bypassed the plug for that wire and used some insulated spade connectors. The good news is you can access that connector without dropping the tank.

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  8. #8 Re: Fuel pump related electrical issues 
    Senior Member Ken L's Avatar
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    I really wish people would post up what cured their issue. Even though the website doesn't get as much traffic as it used to, there are still a lot of very knowledgeable people here that offer solutions, and it creates a searchable database for others. Just my rant.
    Ken L
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  9. #9 Re: Fuel pump related electrical issues 
    Senior Member Grand Slam West Planner
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    Agreed.
    If I ever leave one open it’s because I never resolved the issue.
    "ZJ's were designed with the intention to take 1 really good hit, and fold up. As long as the occupants walked away, it was a success. In the wheeling world, we expect our vehicles to take multiple really good hits, drive out of it, and run the obstacle again!"
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  10. #10 Re: Fuel pump related electrical issues 
    BANNED Daniel-J's Avatar
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    Have you managed to fix this problem? Was it a bad grounding?
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