Question about 1995 Jeep Grand Cherokee

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New fuel pump but no gas to the fuel rail

New fuel pump, new fuelpump relay,new throttle position sensor,checked MAP sensor, replaced crankshaft sensor,pickup coil,etc.....
When I try to start the car it won't start right away. I have to turn key on and let it set for a long time before it will start. It will click from the fuel pump relay, when this stops then the relay on the throttle snaps, it will sometimes start after that, when I try to start again if it doesn't start the injectors snap and RPM gage will fluxuate with injectors. After awhile they will stop snapping, because of this I have gas in my oil.

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  • ziona Feb 11, 2009

    The fuel pump relay does not have 12 v present when key is turned on, only after the relay stops clicking does it have power.

  • ziona Feb 11, 2009

    It is fuel injected and i have checked pressure on fuel rail.

  • ziona Feb 11, 2009

    how do I test the ignition switch?

  • ziona Feb 15, 2009

    After the relays stop clicking, most of the time when you go to start it, it does not fire and when you let off the key, the injectors keep pumping gas into the cylinders, then the gas drains into the oil.If you let it set for at least 1-3 hours the Jeep will start with no problem after leaving the key in the on position.

  • ziona Feb 15, 2009

    Do you know if the pickup coil in the distributor has anything to with activating the fuel pump?

  • ziona Feb 16, 2009

    I have not yet checked codes. I beleive this requires a diagnostic computer check , Correct?

  • Richard Scordino May 11, 2010

    Check codes before going further. If there is fuel in the oil, tou are getting too much fuel into the engine... Have you checked the tps? Let me know what you find.

  • yadayada
    yadayada May 11, 2010

    test the ignition switch.

  • Mark Egan May 11, 2010

    You may have fuel pressure on the rail with the pump running, but does it maintain pressure after the vehicle sits?

    Did you actually measure the pressure, or did you just depress the bleeder on the rail? You need to measure the rail pressure with a gauge and watch to see if it drops after the vehicle sits, not running, for a period of time.

  • Mark Egan May 11, 2010

    Is the engine carburated or or fuel injected?

    If fuel injected, then have you checked the pressure relief valve for the fuel rail? Thee should also be a check valve in the between the fuel pump and the fuel rail (may be a part of the fuel pump). Have you confirmed it's operation?

  • yadayada
    yadayada May 11, 2010

    does the fuel pump relay socket have12 volts present when the key is 1st trurned on?

  • ziona Aug 22, 2010

    After spending Hundreds of $ and hours on trying to figure this out we finally broke down and went to the scrap yard and got a PCM for this car. It only cost about $30. Wish we would have done this a year ago!!!!



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When I first posted, I did not read "comments" after reading what you have done and our results, it seems as though the engine control system "thinks" the engine is running when it is not. I don't believe this is a key switch problem, otherwise if you turned the key to "on" it would flood the engine. Therefore there is a strong possibility that the engine control unit is staying "hot" even when shut down, permitting the pump relay &injectors to receive trigger signals .BUT, I would also take a look at the pressure regulator on the fuel rail. flow through there may be causing the pump to stay on if too much fuel is being bypassed. And, again...did you check codes???

Posted on Feb 16, 2009

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  • Richard Scordino Feb 16, 2009

    If you have a 4.0 engine I believe you can check by turning ign key on, three times, leaving it on the third time. the check eng light will flash in sequences with a pause between flashes. eg: two flashes quickly followed by one flash = the number 21. then a longer pause then next #. Write them down and check in manual for translation.


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You have a intake problem gasket or cracked if gas in oil

Posted on Feb 14, 2009

  • mike raines Feb 16, 2009

    yes check codes with diagnostic computer



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