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Unread 09-09-2009, 11:32 AM   #1
turbojeep88
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96 grand cherokee fuel pump woes

hows it goin guys? my dad is having a problem with his jeep. he parked it at work and it was running fine but when he went to leave it just cranked and cranked. i went to check it out today and i couldn't hear the fuel pump and i noticed the gauges weren't cycling when i turned the key on. i think its the fuel pump but was wondering if the gauges not cycling pointed to something different like a bad ground or ecu or something? what do you guys think?

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Unread 09-09-2009, 11:46 AM   #2
cj7guy
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That's hard to say man. Start checking the basics, fuel, spark compression.

If you have fuel and spark, do a compression test, my guess is that you'll find a problem with one of the first two.
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Unread 09-09-2009, 12:29 PM   #3
rugermack
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If you have fuel and spark, check ths CPS. Does the tac move when you crank the engine ?
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Unread 09-11-2009, 07:42 PM   #4
turbojeep88
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update: it has neither fuel nor spark and the guages wont cycle when switched to on. cranks over fine and all other things electrical seem to work. ran just fine the other day. any suggestions?
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Unread 09-12-2009, 03:13 PM   #5
242forme
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Have you checked the fuses in the Power Distribution Center?(the black rectangular box next to the battery)

A few years ago, my '96 Zj had the same problem you describe. I found one of the fuses blown. It was the fuse for the ASD (automatic shutdown relay) I replaced the fuse and it started right up. Then, when I put it in gear,it blew the same fuse again. On mine the wiring harness for the rear oxygen sensor had sagged down and was rubbing on the driveshaft. The wires were worn through creating a short.
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Unread 09-15-2009, 11:58 PM   #6
turbojeep88
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yea that was the first thing i checked, i didnt notice any blown ones. im goin back to look at it tomorrow hopefully i can figure it out. i googled the problem and found it might be the ecu or the factory alarm system so i guess i'll check that stuff out.
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Unread 09-16-2009, 09:42 AM   #7
CanadianZed-J
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Quote:
Originally Posted by turbojeep88 View Post
...factory alarm system...

The factory alarm does disable the fuel pump but that wouldn't explain no spark.



LC.
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Unread 09-16-2009, 10:03 AM   #8
Coletrickle
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Did you check for codes?

If a CPS fails, it'll let the engine continue running, but won't restart after you shut it down. Just another thing to check. Mine did the same thing as what you're describing and it was bad wires to the CPS.
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Unread 09-16-2009, 10:44 AM   #9
turbojeep88
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i think i figured it out. i unplugged the wire to the cps and the gauges worked again. plugged it back in and no gauges. looks like im replacing the cps tomorrow
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