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DD15 hard starting!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mikem1997, Feb 17, 2019.

Page 1 of 4
  1. Feb 17, 2019 #1
    Mikem1997

    Mikem1997 Bobtail Member

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    Hi, I have a 2012 DD15. I am experiencing hard starts.. when the truck sits overnight or over 2 hours I lose all prime. I nocited I have air bubbles in my Davco filter. I took it to the shop and make sure all lines are tight and they are. They also replaced filter and fuel housing filter. I don’t have a check valve on this engine.. I’m running out of ideas Seems like it’s sucking air from somewhere and returning it back to the tanks overnight every morning I have to prime the primer to get fuel back in the system so I can start the truck has anyone ever experienced anything like this any recommendations that I can look at thank you !! I also just had an inframe done one month ago..
     
    Mikem1997, Feb 17, 2019
    Mikem1997, Feb 17, 2019
    #1
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  3. Feb 17, 2019 #2
    Atlaw4u

    Atlaw4u Heavy Load Member

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    How is it running otherwise? Could it be an issue with the injectors/cups.
     
    Atlaw4u, Feb 17, 2019
    Atlaw4u, Feb 17, 2019
    #2
  4. Feb 17, 2019 #3
    Tombstone69

    Tombstone69 Road Train Member

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    Check your fuel lines for wear or any leakage.There should be a check valve on the tank return.
     
    Tombstone69, Feb 17, 2019
    Tombstone69, Feb 17, 2019
    #3
  5. Feb 17, 2019 #4
    Mikem1997

    Mikem1997 Bobtail Member

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    I just had a inframe done. New injector kit..
     
    Mikem1997, Feb 17, 2019
    Mikem1997, Feb 17, 2019
    #4
  7. Feb 17, 2019 #5
    Mikem1997

    Mikem1997 Bobtail Member

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    I did check and no leakage what’s so ever. Do you know how I can test the system to find out where the air is coming from ?
     
    Mikem1997, Feb 17, 2019
    Mikem1997, Feb 17, 2019
    #5
  8. Feb 17, 2019 #6
    Mikem1997

    Mikem1997 Bobtail Member

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    It runs great no issues.
     
    Mikem1997, Feb 17, 2019
    Mikem1997, Feb 17, 2019
    #6
  9. Feb 17, 2019 #7
    Southern2013

    Southern2013 Bobtail Member

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    Feb 17, 2019
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    Sounds like check valve problem
     
    Southern2013, Feb 17, 2019
    Southern2013, Feb 17, 2019
    #7
  10. Feb 17, 2019 #8
    uncleal13

    uncleal13 Road Train Member

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    Does it have the fuel shut off valves mounted over the transmission?
     
    uncleal13, Feb 17, 2019
    uncleal13, Feb 17, 2019
    #8
  11. Feb 18, 2019 #9
    Rideandrepair

    Rideandrepair Road Train Member

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    If you don’t have a check valve, did they maybe leave it off when OH? Have them check the fuel lines they disturbed while doing OH. Just guessing.
     
    Rideandrepair, Feb 18, 2019
    Rideandrepair, Feb 18, 2019
    #9
  12. Feb 18, 2019 #10
    Tombstone69

    Tombstone69 Road Train Member

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    Put a fuel shutoff on the tank return and see if that helps.If you cap off the feed and put air to the return you might be able to see or hear leakage. It might be time to replace the high pressure pump but that's just a guess. Without being able to see it that's all I can do.Try putting a shut off at the tank return, if it still bleeds down then you know it's not on the return.You can then use the shutoff to pressurized the system.
     
    Tombstone69, Feb 18, 2019
    Tombstone69, Feb 18, 2019
    #10
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