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ISX15 fuel pump

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by joey0921, Aug 21, 2023.

  1. Aug 21, 2023 #1
    joey0921

    joey0921 Bobtail Member

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    Nov 7, 2018
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    Just bought a 2016 with an isx15. Noticed the high pressure fuel pump is leaking some oil up by the gear up front. My question is, do I need to pin the pump before I pull it back enough to get new gasket in? Or can I pull it back and the gear won't move and mark it that way? Thank you.
     
    joey0921, Aug 21, 2023
    joey0921, Aug 21, 2023
    #1
    Oxbow Thanks this.
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  3. Aug 22, 2023 #2
    Goodysnap

    Goodysnap Road Train Member

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    The HP fuel pump is not timed. Just pull it off and replace the gasket.
     
    Goodysnap, Aug 22, 2023
    Goodysnap, Aug 22, 2023
    #2
    Big Road Skateboard, Diesel Dave, QUALITYTRUCK and 1 other person Thank this.
  4. Aug 22, 2023 #3
    joey0921

    joey0921 Bobtail Member

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    5
    Nov 7, 2018
    0
    Maybe I didn't mean the high pressure fuel pump. Maybe just the fuel pump itself where it has the big gear that goes up front. I still dont need to lock the pump at all. Just slide it back and mark it just in case it moves at all?
     
    joey0921, Aug 22, 2023
    joey0921, Aug 22, 2023
    #3
  5. Aug 22, 2023 #4
    Goodysnap

    Goodysnap Road Train Member

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    Neither fuel pump is timed. No marking needed. Take it apart and replace the seals and gaskets as needed to fix your oil leaks.
     
    Goodysnap, Aug 22, 2023
    Goodysnap, Aug 22, 2023
    #4
    Big Road Skateboard, little cat 500 and Diesel Dave Thank this.
  7. Aug 23, 2023 #5
    little cat 500

    little cat 500 Road Train Member

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    why does Cummins sell a tool to time the pump? I just put a high pres pump on mine as well the shop told me to use their timing tool. Just asking so dont jack me up for it
     
    little cat 500, Aug 23, 2023
    little cat 500, Aug 23, 2023
    #5
    Goodysnap Thanks this.
  8. Aug 23, 2023 #6
    Goodysnap

    Goodysnap Road Train Member

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    ISX or X15? ESN ?

    It is always best to follow service info on QSOL for exact direction. X15 does required lash set up for the idler gear to HP fuel pump.
     
    Goodysnap, Aug 23, 2023
    Goodysnap, Aug 23, 2023
    #6
    little cat 500 Thanks this.
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