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Fuel pump

Discussion in 'Early CJ5 and CJ6 Tech' started by russo, Jul 8, 2012.

  1. Jul 8, 2012
    russo

    russo Hope is not a method

    Norris, Tennessee
    Joined:
    Oct 28, 2005
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    498
    How long should a fuel pump last? I put a new one in about six years ago when the jeep started cutting out on me at inopportune times. I have had no problems since then.

    Today it stopped on me twice. I had to let it sit about 10 minutes and then it would crank up. It would spit and sputter some and I hand to keep the RPMs high to keep it running. Very similar to what it was doing six years ago when I installed the new pump.
     
  2. Jul 8, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Sep 23, 2002
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    11,539
    Lots of variables like quality of pump, how much it sits (hard on the diaphragm) and type of fuel used. Newer high alcohol content fuels are hard on older fuel systems....


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  3. Jul 8, 2012
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    All mine seem to last about forever.
     
  4. Jul 9, 2012
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
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    I'm not sure why a fuel pump would work better after sitting for 10 minutes?
     
  5. Jul 9, 2012
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    "I'm not sure why a fuel pump would work better after sitting for 10 minutes?"


    ...some kind of heat related vapor-lock?
     
  6. Jul 9, 2012
    russo

    russo Hope is not a method

    Norris, Tennessee
    Joined:
    Oct 28, 2005
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    Well, it was a little over 100 degrees and a lot of heat in the engine bay. I though some type of vapor related issue, but... It will run 10-15 minutes and then start to spit and sputter and then die. After it sits for a few minutes, it'll crank up and run well for a few more.
     
  7. Jul 9, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Sounds like the fuel pump is putting out some pressure and volume but not enough to keep up with the engine under load.


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  8. Jul 9, 2012
    Pack Rat

    Pack Rat Old Timer

    I live in a...
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    Reminiscent of a fuel fill cap not venting properly.
     
  9. Jul 10, 2012
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
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    Sure. I don't usually think the 100 degree thing.
     
  10. Jul 11, 2012
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
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    "Reminiscent of a fuel fill cap not venting properly."

    I agree. Easy to check, just loosen the cap. But the only time this happened to me, the vacuum actually collapsed the fuel tank.
     
  11. Jul 11, 2012
    sparky

    sparky done Staff Member Founder

    Toowoomba, QLD
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    Sep 20, 2002
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    ah! my Willys pickup did something like this.

    Turns out the float bowl was emptying and the pump couldn't keep up. The pump was fine, but the supply line to the pump that was rubber from the steel line to connect to the pump was collapsing inside at anything above idle.

    That was a head scratcher for sure!

    Good luck.
     
  12. Jul 11, 2012
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
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    2,794
    Or having some kind of floating crap like maybe wasp nesting in there that will plug the pickup and cause that.
     
  13. Jul 11, 2012
    russo

    russo Hope is not a method

    Norris, Tennessee
    Joined:
    Oct 28, 2005
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    498

    That's a though I will have to check. May need a new fuel line.
     

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