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Old 08-13-2012, 01:50 PM   #1
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Unhappy YJ Fuel pump problem.

I was installing a new stereo in my Jeep yesterday. Got everything installed and worked perfectly. I drove it around for about ten minutes and went inside. Came back out and drove it an hour later and all of a sudden all my lights on the dash went off. Stopped to check it out, and now it won't start. No power to the fuel pump. I can't hear it at all when the key is in the on position. Switched around the relays and still nothing. Checked the ground wire and it's tight. Any help would be much appreciated. This is my DD and I'm stranded at my sister's house!

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Old 08-13-2012, 02:07 PM   #2
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Are you getting any codes? Check engine light? Does it crank but just won't turn over?

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Old 08-13-2012, 02:27 PM   #3
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No codes, no lights, turns over but won't start. I thought I may have accidentally cut the ground wire when I was removing the old speaker wire, but from searching this site found that the ground wire in the 93 is on the firewall behind the battery. I'm stumped! it ran great and then all of a sudden, nothing.
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Old 08-13-2012, 02:33 PM   #4
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Well if you have a late I6 like my 94 here you can go to your relay box and run power directly to the terminal marked with a green arrow, It leads to the fuel pump so if your fuel pump still works, you can get running and get yourself home to fix it right.




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Old 08-13-2012, 02:35 PM   #5
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No power to the fuel pump means an electrical problem. Disconnect the ground wire terminal on the fuel pump and clean the area down to bare metal again, confirming good chassis ground, reinstall. Start from the battery and work your way back towards the pump, following the pumps Hot + wire. Make sure you have a good charge on the battery too, and also confirm that your Alternator is able to keep up with the electrical demand.

I had that happen to me years ago when I first bought my Jeep, I put in a new radio, drove around for a day or two, and BAM! Dash lights went out, lost all indications and electrical power, fuel pump failed and my Jeep stalled-out. My problem was the Alternator. I guess my old Alternator couldn't handle anymore juice taken from it, and the battery slowly drained away since it wasn't being charged.
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Old 08-13-2012, 02:37 PM   #6
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That is strange. Sounds almost like you have a bad major ground (or supply). Check the power distro box by the battery. Is the cable and connector there on tight? not corroded? in good shape? What about the power wire to the starter? and ground? Ground to the firewall? Wiggle the connections and make sure they are solid and well connected.

I ended up replacing all of these cables at once time and, when I did, found that two of those connections were rusted under the otherwise solid looking connection.
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Old 08-13-2012, 03:25 PM   #7
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I switched the relay with the horn and nothing, no fuel OR horn so I thought maybe both were bad. Got two more and replaced fuel pump and asd relay still nothing. All wire connections are good, grounds are good. What on earth...
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Old 08-13-2012, 03:30 PM   #8
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I have a question; if the alternator is bad, and I turn the key to the on position, would I hear my fuel pump kick on only from battery power?
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Old 08-13-2012, 03:35 PM   #9
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I can't hear my fuel pump running unless my tank is low so I would say no
also if your battery is topped you should be able to start either way you can check the battery with a multi-meter or you can try getting started with a jump.

Did you try running power directly to your pump to see if you got fuel pressure?
If you try and there is no pressure it could be a clogged fuel filter, bad regulator or dead pump.
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Old 08-14-2012, 07:19 PM   #10
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Have you checked for power to the pump. Unplug the connector and have someone turn the motor over as you place a test light to the green/black wire. It should light up if there is power going to it.
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Old 01-31-2014, 10:36 PM   #11
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I have a 91 yj. when I turn the key on, the auto shut down relay kicks and no fuel is getting to the engine. The engine turns over and it has spark. what should I check?
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Old 02-01-2014, 09:05 AM   #12
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My 92 did the same thing after clearing out wires under the dash I had accidentally pulled the dome light fuse out and it would just roll over but no fuel put it back in and started right up
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Old 02-01-2014, 09:29 AM   #13
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Rirst things first, Check ALL fuses with a voltmeter or test light. Then check relays.
Then check and see it you are getting power and ground to the fuel pump plug at the tank.
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Old 02-01-2014, 12:06 PM   #14
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Hmm.......both 4x4muscle and you have the basically the same problem after being under the dash...do you guys work on each others jeeps?
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Old 02-01-2014, 01:30 PM   #15
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Quote:
Originally Posted by Garyk View Post
Hmm.......both 4x4muscle and you have the basically the same problem after being under the dash...do you guys work on each others jeeps?
Ha!

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