Px8 fuel problem

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Racinemobile, Jan 17, 2022.

  1. Racinemobile

    Racinemobile Bobtail Member

    4
    0
    Feb 16, 2021
    0
    2010 px8 loosing rail pressure after hard acceleration. 559 code
    Checked for prv and was dumping a lot of fuel, replaced. Same thing
    One plunger was stuck in hpfp still no luck
    Lift pump supply at hpfp is good,
    But once rail pressure is lost notice fuel/water sep 1/2 full every time, can’t seem to find any cracks/loose lines
    Excess return? Injector/tube leaking?
    Is there a screen inline of these fuel systems that could be blocked up ?
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,667
    1,574
    Jun 14, 2009
    romulus,mi
    0
    Excess return in one or more injector(s). Problem is with the "little red engines" can't do a fuel decay test.
     
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