DD15 loosing fuel prime

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

  1. Mechanic jeff

    Mechanic jeff Bobtail Member

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    Feb 22, 2024
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    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
     
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  3. OlegMel

    OlegMel Light Load Member

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    Apr 8, 2023
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    Davco check valve maybe?
     
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  4. rolls canardly

    rolls canardly Road Train Member

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    Feb 7, 2009
    mt. pocono. pa.
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    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
     
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  5. Luwi67

    Luwi67 Heavy Load Member

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    Oct 24, 2012
    Long island
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    Battery voltage dropping to 7.8 while cranking sounds like a problem all it's own.
     
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