Prostar shut off while going down the road

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Magicautocenter, Jun 2, 2019.

  1. Magicautocenter

    Magicautocenter Bobtail Member

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    Hi guys, i have a 2008 prostar isx cummins that's shutting off while going down the road. It starts back up right away but shuts off as soon as i press down on the pedal. Eventually if i keep trying to keep driving it ill shut off and if i take it out of gear it ill shut off completely. Seems like it’s running out of diesel because after i stop i can hear the electric pump running and after electric pump stop i can restart the truck. To be able to keep driving i have to just touch the gas pedal just very little, if i press the gas pedal hard it stalls.
     
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  3. McMahons Trucking

    McMahons Trucking Light Load Member

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    Have you changed fuel filters latelety or checked fuel pressure?
     
  4. Magicautocenter

    Magicautocenter Bobtail Member

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    Change fuel filters already. How do I check fuel pressure. Thanks
     
  5. Goodysnap

    Goodysnap Road Train Member

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    I would start with checking for air in fuel. Sounds like it sucking air to me.
     
    spsauerland Thanks this.
  6. Magicautocenter

    Magicautocenter Bobtail Member

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    Ill check the fuel lines..thanks
     
  7. spsauerland

    spsauerland Road Train Member

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    If fuel all checks, I have had the ECM die on three CM871 ISX with same symptoms. Had one make it back 400 miles with a bag of ice on it!
     
  8. Magicautocenter

    Magicautocenter Bobtail Member

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    Can I check fuel pressure at the fuel filter housing between the fuel tank and the prime pump? Or after the mechanical pump.
     
  9. McMahons Trucking

    McMahons Trucking Light Load Member

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    Check it after the pump to be sure the pump is working.
     
  10. Magicautocenter

    Magicautocenter Bobtail Member

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  11. Heavyd

    Heavyd Road Train Member

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    That electric pump only comes on at key on. I would say your ecm is losing ignition or battery power.
     
    spsauerland Thanks this.
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