Question about 1990 Jeep Wrangler

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1900 wrangler will not start.

Engines turns over and has fire. I feel it is a fuel pump. I have looked for a fuse but cannot find one. on a 1995 it is beside battery but nothing on a 1990 ( Where is it located) Or is there something else wrong. I have located a connector next to fuel tank that has three wires. I used a test light and cannot find any power there.

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  • ingramm61 Dec 28, 2008

    I think it is fuel pump or power to it. It was running fine. turned it off and now it will not start, cannot hear fuel pump whine.

    getting good spark

    if i prime it starts for a bit

    good compresson

    where is fuel pump relay? I cannot find it!!!

  • ingramm61 Dec 28, 2008

    thanks for the information. However I do not have a second fuse box under the engine compartment. ( the 1990 does not have a fuse box under the hood) It does have two relays beside the battery box., I have swaped them and it does not help.I buy ans sell jeeps and am familiar with the fuse box you are talking about on later models. I belive this is the first year for fuel injection. I have gone to the back of the jeep (under) beside the fuel tank and found a connector that has three wires going to the tank. i have used a test light (found good ground with one end of test light) and with iginition switch on tested all three wires and have not found any power.

  • ingramm61 Dec 30, 2008

    found the problem!! It was a loose ground :-) Thanks everyone



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Why are you so sure it's the fuel pump?

Are (ALL) the plugs getting spark?

Is there adaquate back pressure?

Is there good compression?

Have you confirmed a circuit to the fuel pump?

Is the pump getting voltage and ground?

Have you confirmed a working fuel pump relay?

Posted on Dec 28, 2008

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  • Peter Fadoulakis
    Peter Fadoulakis Dec 28, 2008

    The fuel pump relay is located in a second fuse box in the engine compartment. In that same box is a relay called the "ASD" relay. It means Auto Shut Down. That could also be the problem. As a test, try swapping the "ASD" with the A/C relay to see if the Jeep starts.

  • Peter Fadoulakis
    Peter Fadoulakis Dec 29, 2008

    One of those two relays near the battery box should be the fuel pump relay. With the key on, engine off (and a second person to turn the key) you should feel the relay clink on. If it doesn't then try tapping on the relay. The relay could be stuck in the open position. Sometimes tapping on it free's it up. Also make sure that the contacts that the relay comes in contact with have voltage. If all fails, you'll have to troubleshoot the circuit from the fuel pump to the front of the jeep to find the open power wire.

  • Peter Fadoulakis
    Peter Fadoulakis Dec 30, 2008

    You're welcome.



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Sound like a connection (loos of the ground circuit) problem to the in tank fuel pump, I wouls suggest you check all the connections from the fire wall back for any loose or corroded connectors.

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