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2014 peterbilt isx fuel rail pressure warning

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by BIG DAWG 1, Sep 20, 2019.

  1. Sep 20, 2019 #1
    BIG DAWG 1

    BIG DAWG 1 Bobtail Member

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    Jan 3, 2012
    carson heights
    0
    Hello new to the forum
    I got a 14 pete with isx hask 286k
    Engine took a poop due to fuel pump failure had inframe done rebuilt fuel pump replaced 6 injectors with rebuilt ones been out the shop 3 weeks fuel rail pressure warning came on i took it back to shop and mechanic changed out 2 injectors 2 days later same warning came back on he changed out 4 injectors and now 3 days later light is back on is there anything else that can be causing this?
    Im located in los Angeles area ca. Thx for any info
     
    BIG DAWG 1, Sep 20, 2019
    BIG DAWG 1, Sep 20, 2019
    #1
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  3. Sep 20, 2019 #2
    jsnell

    jsnell Light Load Member

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    I am not an expert, my understanding is that if the fuel pump pistons shatter and take out the motor it can't be rebuilt because the metal fragments can't be fully removed from the fuel system. I would call Cummins customer service and ask them.
     
    jsnell, Sep 20, 2019
    jsnell, Sep 20, 2019
    #2
  4. Sep 20, 2019 #3
    pushbroom

    pushbroom Road Train Member

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    If its a 559 code it could be a leaking fuel rail pressure relief valve or a faulty pump head and or pump cam/followers.
    Is the mechanic actually following the 559 troubleshooting steps? What is the actual code?
     
    pushbroom, Sep 20, 2019
    pushbroom, Sep 20, 2019
    #3
    spsauerland Thanks this.
  5. Sep 20, 2019 #4
    Midwest Trucker

    Midwest Trucker Road Train Member

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    Take it to Cummins. I highly doubt it has anything to do with the injectors.

    I have a 2014 with Cummins that was running very poorly all of a sudden and it was the fuel rail. I’ll have to see what they replaced but it definitely wasn’t injectors.
     
    Midwest Trucker, Sep 20, 2019
    Midwest Trucker, Sep 20, 2019
    #4
  7. Sep 20, 2019 #5
    pushbroom

    pushbroom Road Train Member

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    Injectors can absolutely cause low fuel pressure. Being they have all been replaced, probably not the case anymore in this instance
     
    pushbroom, Sep 20, 2019
    pushbroom, Sep 20, 2019
    #5
    spsauerland Thanks this.
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