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Air in return line...2002 ISX

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Crazy Alex, Aug 12, 2017.

  1. Aug 12, 2017 #1
    Crazy Alex

    Crazy Alex Light Load Member

    161
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    Dec 1, 2012
    Here n there
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    Getting air in return line.
    A lot of work done to eliminate this problem:
    *To make sure there is no leaks in fuel lines between fuel tank and fuel plate,engine was fed fuel out of bucket trough a line plugged in straight into the fuel plate.
    *New lift pump
    *New reman injectors
    *New fuel shut off solenoid
    *Finally installed new head

    Air still in return line,engine pulls ok,but works rough at idle...
     
    Crazy Alex, Aug 12, 2017
    Crazy Alex, Aug 12, 2017
    #1
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  3. Aug 12, 2017 #2
    Heavyd

    Heavyd Road Train Member

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    It is normal to see some air bubbles in the return line. It will never be a solid stream of fuel.
     
    Heavyd, Aug 12, 2017
    Heavyd, Aug 12, 2017
    #2
  4. Aug 13, 2017 #3
    Crazy Alex

    Crazy Alex Light Load Member

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    Dec 1, 2012
    Here n there
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    It's not,at least not as much...It's about 40% of air in return fuel...if that would be the only thing,I wouldn't care,but after pulling under a load,the engine works rough at idle,coughing and spitting in muffler...assuming thats air in fuel causing that
     
    Crazy Alex, Aug 13, 2017
    Crazy Alex, Aug 13, 2017
    #3
  5. Aug 13, 2017 #4
    Heavyd

    Heavyd Road Train Member

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    Faulty metering or timing actuators will cause rough running. Believe it or not, I have seen rough running at idle due to poor engine grounds.
     
    Heavyd, Aug 13, 2017
    Heavyd, Aug 13, 2017
    #4
  7. Aug 13, 2017 #5
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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    x2 on actuators. Been there many times for rough idle.
     
    QUALITYTRUCK, Aug 13, 2017
    QUALITYTRUCK, Aug 13, 2017
    #5
    Heavyd Thanks this.
  8. Aug 14, 2017 #6
    pushbroom

    pushbroom Road Train Member

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    Cats and paccar motors have to have no bubbles in the return line to run correctly. ISX;'s always seem to have air in the return on them. It is a normal operating condition for ISX's. As said above, timing/meter actuators, poor power/ground, low fuel pressure, ect.
     
    pushbroom, Aug 14, 2017
    pushbroom, Aug 14, 2017
    #6
    Heavyd Thanks this.
  9. Aug 16, 2017 #7
    nasriza

    nasriza Road Train Member

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    Chicago, IL
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    actuators X3
     
    nasriza, Aug 16, 2017
    nasriza, Aug 16, 2017
    #7
    Heavyd Thanks this.
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