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3406E Losing Prime

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by RollinCoal02, Jan 31, 2018.

Page 2 of 3
  1. Feb 16, 2018 #11
    RollinCoal02

    RollinCoal02 Bobtail Member

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    Dec 28, 2016
    Green Bay, WI
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    tank breathers are clear. truck idles around 75psi. we replaced the fuel filter housing on the engine with a brand new unit. and put a one way check valve at the top of the suction at the tank so if it was draining back that would stop it. Is it possible bad injector orings could cause this issue?
     
    Last edited: Feb 16, 2018
    RollinCoal02, Feb 16, 2018
    RollinCoal02, Feb 16, 2018
    #11
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  3. Feb 16, 2018 #12
    swaan

    swaan Road Train Member

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    Does it still start fine but quits after 30 seconds or so??

    What did you do with the filter housing on the frame.?

    There is also a one way check valve on filter housing on engine but I'm guessing you prob changed that already?
     
    swaan, Feb 16, 2018
    swaan, Feb 16, 2018
    #12
  4. Feb 16, 2018 #13
    RollinCoal02

    RollinCoal02 Bobtail Member

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    Green Bay, WI
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    yes still same symptoms. didnt do anything with the housing on the frame. this engine doesnt have the check valve on the filter base.(but yes the check valve was replaced) it has its own fuel distribution block. See image.[​IMG][​IMG]
     
    RollinCoal02, Feb 16, 2018
    RollinCoal02, Feb 16, 2018
    #13
  5. Feb 16, 2018 #14
    swaan

    swaan Road Train Member

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    It' Is not your injector O RINGS. I say this because of the fact it starts fine and runs for 30 seconds. If it was on the pressure side of the fuel system it would not start.

    It has to be on the suction side.

    I would bypass the filter housing on the frame by joining the lines together. Probley a #10 JIC MALE×MALE.
    Run it a day like that to see if your problem goes away. You won't hurt anything by bypassing it for a bit to see.
     
    swaan, Feb 16, 2018
    swaan, Feb 16, 2018
    #14
    RollinCoal02 Thanks this.
  7. Feb 16, 2018 #15
    RollinCoal02

    RollinCoal02 Bobtail Member

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    Dec 28, 2016
    Green Bay, WI
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    after shutting the truck off the pressure in the system drops to 0 within 5 minutes
     
    RollinCoal02, Feb 16, 2018
    RollinCoal02, Feb 16, 2018
    #15
  8. Feb 16, 2018 #16
    swaan

    swaan Road Train Member

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    AGAIN. it starts fine, it is not a pressure issue. Cats need No air and good pressure to start........

    It' Is picking up air from the suction side somewhere.
     
    swaan, Feb 16, 2018
    swaan, Feb 16, 2018
    #16
    RollinCoal02 Thanks this.
  9. Feb 16, 2018 #17
    Chris50

    Chris50 Medium Load Member

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    Just throwing this out there... I have a C15 and it would lose prime after it sat overnight. It was a bad fuel transfer pump.
     
    Chris50, Feb 16, 2018
    Chris50, Feb 16, 2018
    #17
    swaan Thanks this.
  10. Feb 16, 2018 #18
    swaan

    swaan Road Train Member

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    Yes This also^^^^^^

    We told him that already.

    I'l repeat again. It' Is on the suction side.
     
    swaan, Feb 16, 2018
    swaan, Feb 16, 2018
    #18
    Oxbow, spsauerland and RollinCoal02 Thank this.
  11. Feb 16, 2018 #19
    RollinCoal02

    RollinCoal02 Bobtail Member

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    Dec 28, 2016
    Green Bay, WI
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    can the transfer pump still be bad even if its putting out good pressure?
     
    RollinCoal02, Feb 16, 2018
    RollinCoal02, Feb 16, 2018
    #19
  12. Feb 16, 2018 #20
    spsauerland

    spsauerland Road Train Member

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    I agree fully with @swaan on this.
     

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    spsauerland, Feb 16, 2018
    spsauerland, Feb 16, 2018
    #20
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