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Unread 02-24-2010, 01:46 PM   #1
littlefdl
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1994 ZJ 
 
Join Date: Mar 2009
Location: High Point, NC
Posts: 160
Fuel pump relay location??

either my fuel pump or fuel pump relay is going bad. pump doesnt run when i turn the key to on position or when i try to just start it up. i have to leave the key in the on position for about 4 minutes before i hear it come on then the jeep will start and it runs fine..no stalling or hesitation. i want to start by replacing the relay since its only 6 bucks but i lost to top to the fuse panel under the hood. can anyone tell me which one is the fuel pump relay?

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Unread 02-25-2010, 10:54 AM   #2
greasefingers
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1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
Sounds like the classic leaking capacitors inside the PCM issue.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 02-25-2010, 11:10 AM   #3
JesseOR
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Location: Eugene, Oregon
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Serious? There is the one that says, FUEL PUMP up to the left. That is the one he is looking for.

But yes it MAY be the ecu...

Try the relay first....
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Unread 02-25-2010, 11:32 AM   #4
greasefingers
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1994 ZJ 
 
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Location: Northern VA, USA, NJ
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This picture is a couple years old and I took it because someone was looking for the fuel pump fuse. I should have stated that before. Yes the relay is clearly above it and to the left

It is almost never the relays. They are very dependable. Swap them around before purchasing.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 02-25-2010, 07:03 PM   #5
littlefdl
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1994 ZJ 
 
Join Date: Mar 2009
Location: High Point, NC
Posts: 160
Took the jeep to the shop today and i have an electrical short somewhere in the jeep. we tested the fuel pump relay slot with voltmeter and it would not keep a constant spark. tried to trace the short but could not find the source of the problem. after 215,000 miles im startng to think the PCM has bit the dust and is causing the problem.After 5 mins wit the key in ON position the fuel pump begins to run, jeep will crank and run fine. where can i find a PCM for a decent price?
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