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DD15 loosing fuel prime

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mechanic jeff, Feb 22, 2024.

  1. Feb 22, 2024 #1
    Mechanic jeff

    Mechanic jeff Bobtail Member

    1
    0
    Feb 22, 2024
    0
    The truck spinning over turns 90 rpm’s nothing more. It has the three filter system on it and sitting here has no fuel in filter base. I prime truck up with primer pump and just flows back into the tanks not priming the motor. Battery voltage is up at 12.5 and drops at the starter to 7.8 while cranking. Trucks whipping my butt. Help
     
    Mechanic jeff, Feb 22, 2024
    Mechanic jeff, Feb 22, 2024
    #1
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  3. Feb 23, 2024 #2
    OlegMel

    OlegMel Light Load Member

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    357
    Apr 8, 2023
    0
    Davco check valve maybe?
     
    OlegMel, Feb 23, 2024
    OlegMel, Feb 23, 2024
    #2
    Concorde Thanks this.
  4. Feb 25, 2024 #3
    rolls canardly

    rolls canardly Road Train Member

    1,521
    2,929
    Feb 7, 2009
    mt. pocono. pa.
    0
    Here's a thread on your issue, its Volvo, and from 2013, but fuel is fuel.
    Sounds like check valve is stuck open.

    Dump this into Search bar on top right of page.
    Hard starting and Davco 382 leak down issue
     
    rolls canardly, Feb 25, 2024
    rolls canardly, Feb 25, 2024
    #3
    Concorde Thanks this.
  5. Feb 27, 2024 #4
    Luwi67

    Luwi67 Heavy Load Member

    725
    459
    Oct 24, 2012
    Long island
    0
    Battery voltage dropping to 7.8 while cranking sounds like a problem all it's own.
     
    Luwi67, Feb 27, 2024
    Luwi67, Feb 27, 2024
    #4
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