Question about 1999 Jeep Wrangler

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Staring issue... 1999 Jeep Wrangler 4 cylinder(manual tran). recently I've noticed that in the morning or after it's sat for while, when I turn the key the engine cranks for a couple of seconds before turning over. the battery seems good, the starter has the juice to keep turning and nothing seems to pull down like the starting system is the issue. Could this be something to do with the fuel delivery? What should I do? Thanks

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  • BJ Balentine
    BJ Balentine Sep 30, 2009

    Just so I'm clear...
    When I put the key in and turn it to where the radio comes on, then let it sit for just a couple of seconds. It fires right up when I turn it over.

    This means I need to eventually replace the fuel pump. It will work for a while I guess, but gradually bet worse and I'll have to replace it.

    Right??

    Thanks

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  • Jeep Master
  • 6,982 Answers

Instead of cranking, just leave key on for a minute...if there isn't a delay starting after that it may be a bad drainback valve in the pump. You can either live with it for a while or replace pump...but check that it's not an injector leaking into engine first.(usually if that's the case, leaving key on will lengthen start time and give a puff of black smoke on startup)

Posted on Jul 23, 2009

  • Richard Scordino Sep 30, 2009

    If you are turning the key to the "on" position and waiting, then it starts, likely the anti-drainback valve in the pump is allowing the fuel to drain partially from the system. If the pump motor is OK (likely it is) it may last a pretty long time like that. Ive been trying to find someone who makes a filter with a valve in it to combat that problem but haven't come up with anything except for an expensive valve from summit racing, which I feel is too expensive to fix a small problem.
    Hope that makes sense to you now!!!


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