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  1. 6.5L Diesel Engine
    Thank you everyone for helping me out with ideas on this problem. I tried to be very thorough with the history of the vehicle and the mods below and anytime I fixed or serviced something. Describe the problem you are having in detail: The truck is struggling at 55/60 MPH. I took the truck into...
  2. Duramax Second Generation: 2004.5-2005 (LLY)
    Hello all, Got time to try to fix a loss of prime that happens every two weeks, I know air is coming in before filter housing and after fuel disconnects on top of motor. I looked at some fuel diagrams not seeing anything besides FICM.Link to air in line video. I’m assuming this is to much air...
  3. 6.5L Diesel Engine
    Noticed something curious the other day. I have clear fuel line between the IP and the steel return line. I saw and air bubble in it. Started up and the bubble cleared. When I shut down it came back, but rose out of the return line side. Any ideas how this could be? Thanks
  4. Duramax Second Generation: 2004.5-2005 (LLY)
    Does anyone know what could cause air to be returning to the tank? I have replaced all fuel lines, filter head twice, sending unit twice, FPRV, fuel cap, fuel cooler. Clear lines show lots of bubbles on return line and they are passing thru to the supply side which I have been chasing the supply...
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