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  1. 01-04.5 LB7 Duramax Powertrain
    Vehicle 2003 GMC Sierra 2500HD 6.6 LB7 Just got done changing out the Fuel Injectors and New CP3, all back together and go to start it and nothing. *Replaced the fuel system in the tank *Replaced one of the hard fuel lines which I accidently snapped *New ACDelco fuel filter *Rebuilt the fuel...
  2. 01-04.5 LB7 Duramax Powertrain
    I attached a line to my return line off of the cp3 and capped off where the line would have plugged into. Also disabled the lift pump and this is all the fuel I get after 15 seconds of cranking. I did this 2 times with the same results.
  3. 911 Problems Forum
    Hey, I'm new here, but not new to the Duramax. Owned my '05 Silverado 2500HD since '07 (off someone's lease) and driven it to 303,000. This time I'm stumped... When it quit I'd driven about 1/2 hour, and just made it to turn into my driveway when the engine shut off and would not restart...
  4. 07.5-10 LMM Duramax Powertrain
    What have you guys been getting quoted for injector pump replacement? I thought book time was around 6 hours, but I'm getting quoted 18.
  5. 2011-2016 (Non Powertrain)
    Hey all, Looking to convert my CP4 to a CP3 soon.. the truck is deleted.. EGR/DPF gone and cold air intake installed. From what I’m seeing online it looks like all I need to do is pull the intake, egr/DPF, move the fuel lines and I should be able to pull the CP4 off from the 4 bolts which...
  6. General Discussion
    Does anyone know where I can buy the short metering device extension cable and the temp sensor holding block, see the two items circled in red in the attached photo.
  7. 11-16 LML Performance Parts Discussion
    Hey everyone, New member to the forum but have been creeping since I bought my 2015 GMC Denali 2500HD back in October of 2014. I finally pulled the trigger on Improving my trucks performance after 138K miles. I purchased ecm & tcm soft tunes, passenger up-pipe, MBRP downpipe, 5 inch straight...
  8. 06-07 LBZ & LLY Duramax Powertrain
    I just did an engine swap on my 2006 LBZ I replaced everything that turns and supports the engine in any way shape or form I have a horrible whining sound coming from the front of the engine I suspect it's either the new CP3 pump or the new water pump gears it sounds just like a gear drive cam...
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