Fuel pressure low

Discussion in 'Ask An Owner Operator' started by Jonnangharhary, Jun 18, 2021.

  1. Jonnangharhary

    Jonnangharhary Bobtail Member

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    Jun 18, 2021
    0
    Hi guys,
    I have a Cummins ISX 2012 I having low fuel pressure sensor code. It stalls on low RPM but it is good on highway Alain it stalls on up hill when heavy, I changed following things but it did not fix the fuel pressure sensor, changed fuel regulator solenoid,
    I changed fuel rail pressure relive valve, changed one of the injector and ECM but still Sam issue any Idea what needs to be looked into.
     
    77fib77 Thanks this.
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  3. snowwy

    snowwy Road Train Member

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    Jul 6, 2009
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    Fuel filters. Fuel pump.

    How many miles?
     
    Midwest Trucker and beastr123 Thank this.
  4. Spyro2112

    Spyro2112 Medium Load Member

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    Mar 17, 2018
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    Injectors, fuel pump is electronic. Works or dont
     
  5. mudflap77

    mudflap77 Medium Load Member

    657
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    Oct 11, 2010
    South western Ontario
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    High pressure pump is not electronic.
    These Pumps are well know to cause issues.
    If it is the pump coming apart you have probably screwed engine if it is so bad that it is stalling.
     
    Last edited: Jun 18, 2021
    Magoo1968 and jamespmack Thank this.
  6. AModelCat

    AModelCat Road Train Member

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    Was this one of those ISX engines with the ceramic fuel pump plungers? If it is I'd look at that before the engine becomes a literal boat anchor.
     
    shooter19802003 Thanks this.
  7. Midwest Trucker

    Midwest Trucker Road Train Member

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    Aug 31, 2018
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    Maybe you have a clogged fuel filter? Maybe the fuel lines are going bad?
     
    drivinhome Thanks this.
  8. snowwy

    snowwy Road Train Member

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    Jul 6, 2009
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    How long do those things last?
    I don't know the specific on the engine but I'm driving a 12 t800 with isx now.

    And what do you know about the oil leaks? This block has the same da-- leak in the exact same spot the 05 w900 had i drove 12 years ago. Warped timing cover.
     
  9. mudflap77

    mudflap77 Medium Load Member

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    Oct 11, 2010
    South western Ontario
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    A lot of the pumps with ceramic pistons detonated between 400 and 500,000miles.
    Even the upgraded steel pistons should be replaced by 600 000. It's much better to rebuild the pumps then waiting for a failure. They have a habit of wiping out the entire engine.
    The isx 2250 all came from factory with the ceramic pistons. Apparently some of the early 2350's randomly ended up with the old ceramic pumps.
     
    drivinhome and snowwy Thank this.
  10. Jonnangharhary

    Jonnangharhary Bobtail Member

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    Jun 18, 2021
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    It has 780 k in mileage but it has been overhaul at 747.
     
    Last edited: Jun 19, 2021
  11. Jonnangharhary

    Jonnangharhary Bobtail Member

    6
    1
    Jun 18, 2021
    0
    I have not gotten the injector checked out but the mechanic said they are responding and the fuel pump is new it only has about 33k miles on it and you could clearly hear the sound of it when u turn the key on before turning it on.
     
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