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Old 04-05-2014, 12:12 AM   #1
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Fuel delivery

Today my 91 yj died on me, while on my way to get gass it out of no where stalled and didn't turn back on. Gas gauge reed low of gas but not empty. I pull the fuel line that has the circle around it and cycled the key and no gas came out even when I tried turning it on still no gas, don't even hear the fuel pump turning on therefore make me think it's a fuel pump, if it could be anything else let me know, also is doing a fuel pump hard and I have to pull the whole gas tank correct? Thanks-Ryan
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Old 04-05-2014, 11:36 AM   #2
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Bump, still not running

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Old 04-05-2014, 12:14 PM   #3
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To start, I'd check the fuel pump relay. Make sure you are getting power to the relay and that the relay is good.

If you have power to the relay, and the relay is good, then I'd suspect a problem in the fuel tank. Could be a problem with the fuel pickup tube or the pump itself may be be bad. The fuel pump is in the tank for the 4.0L engine.
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Old 04-07-2014, 06:36 AM   #4
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Is the "Check Engine Light" illuminating when the ignition switch is turned on (not the actual cranking position but the "on" position)???

I know this is a sign the computer capacitors are burned up on a '94 YJ. There is a reall good DIY thread somewhere on this repair.
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Old 04-07-2014, 08:19 AM   #5
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Like NR said, check the relay, it's in the box in front of your battery. Most of those relays are the same. You can borrow one of the others like ABS or AC as a check. There is also a fuse for the fuel pump, and maybe two (?) fuses related to ECU.

Actually, the line you pulled I beleive is the fuel return line. The fuel pressure regulator is in line with it on the fuel rail.
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Old 04-13-2014, 12:48 PM   #6
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So just started troubleshooting and got some good and bad news today, the fuse for the fuel system ecu (30A) was broke so I borrowed the same fuse from the head lamp system and I heard my fuel pump turn on I believe and I proceeded to start the jeep and it wouldn't, I got out and checked that fuse again and it was broke. So as of now I have to find the right fuse box to wires diagram so I can check each wire to make sure none are shorting out. Correct me if I'm wrong please also a diagram would be much appreciated. Thanks
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Old 04-13-2014, 02:35 PM   #7
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Old 04-13-2014, 02:43 PM   #8
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Old 04-13-2014, 03:49 PM   #9
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You could also have a bad pump, if the pump is pretty old it could have an internal short causing fuse to blow. RedneckYJ has the pics of ETM manual, check for shorts and if continuity from pump and relay to fuse box, if all is good I would look into pump.
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Old 04-13-2014, 03:56 PM   #10
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I would check the electrical connection for the pump back at the tank. You can also check the continuity of the power wire from the pump relay to the tank if you have a long enough jumper wire.

The tank wires have a plug that is in the upper rear driver's side fender well.

A multi-meter is your best friend when you are having electrical problems.
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Old 04-14-2014, 07:54 AM   #11
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Thank you guys a lot. Also big thanks to redneckYJ for the pictures, so from what I'm hearing it's a good idea to drop the tank and check the connection and also are there only 2 wires running from that fuel system ecu. Fuse is that correct?
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Old 04-14-2014, 08:03 AM   #12
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You don't have to drop the tank to check the wires there. The plug is up in the back side of the driver's side fender well.

With the key on, if you have power in that plug, THEN, you will need to drop the tank and take a look at the pump. Could just be that the ground wire (mounts to one of the mounting screws for the pump) has rotted off or is corroded. No ground, no pump.

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