Question about 1995 Jeep Grand Cherokee

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Fuel pump I started my jeep and it stuttered a bit and then ran fine. I drove to my destination went inside came out to start it up it wouldn't start. It acted like it didn't have gas. But I filled the tank the day before. Someone suggested opening the fuel tank and I did that still didn't work. I also replaced the relay fuse under the hood still wouldn't start. It was suggested it is the fuel pump. How can I check and fix this problem. Thank you stranded.

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  • laststraw61 Jul 25, 2008

    I have a similar problem with my 1995 Grand Cherokee (257000 miles) and if it is the fuel pump, it will be the fourth since we bought in 1996. I can hear the pump start when the ignition is turned on and it runs for 2-3 sec, I thought I could check by disconnecting the fuel line at the filter and see if the pump would continue to run, trying to build pressure, but it stops, after 2 secs, is this normal and should I be looking elsewhere for the problem. i don`t know how to check the ignition to see if I am getting a spark. Thanks in advance, Michael.

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When an engine doesn't run, the first two questions are:

  1. Is there Spark?
  2. Is it getting fuel?
Since there is a relay for the fuel pump, it's got to be electric.

One way to check if the pump is working?

Listen.
  • Turn your ignition to ON (not Start)
  • You should here a low hum come on as the fuel pump pressurizes the lines. It lasts for maybe two seconds and then cuts out.
  • If you missed it, turn the to OFF, wait 15-30 seconds, turn it back to ON.
To force the pump on (checking purposes only) involves that relay you replaced. More specifically, the socket you installed it in. To do this:
  • You need a short piece of wire, stripped at both ends
  • Pull the fuel pump relay. Notice it has five 'spade' type connectors on it. Two vertical, three horizontal.
  • The two outside of the three horizontal are the 'Normally Open' circuit. When these close the fuel pump runs.
  • Turn your ignition to ON
  • To close them manually, locate the two corresponding holes in the socket and put the wire ends in them
  • You should hear the pump start. Whether you do or not, pull the wire. Replace the relay
If you heard the pump run, I'd check for spark. Then I'd check fuel pressure at the injector rail.

I'll need more info to take you through that (engine size, confirm MPFI)

Another question, the last time you filled it with gas, was it nearly empty? Sometimes **** at the bottom of the tank can gum up the works.

Hope this helps

Mike



Posted on Jul 20, 2008

  • Justin Case
    Justin Case Jul 20, 2008

    Update:

    I err'ed on my previous solution. Specifically the description of the relay connectors.



    The two connectors you want to jump are 87 to 30.

    Sorry about that

    Mike




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