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1-14 of 15 Results
  1. Maintenance
    i’ve got 172,393 miles & my cp4 pump is still going strong. should i consider doing a cp3 conversion?
  2. 11-16 LML Duramax Powertrain
    Hi all! New member here. I have a 2015 with 415k on it. I’ve had super luck with the truck overall, but alas I figured it had a blown head gasket when I was putting a gallon of coolant in at every fuel stop… I found a diesel performance shop where I live in Ocala, FL. As I suspected they told me...
  3. 11-16 LML Duramax Powertrain
    Hey all! I'm another Duramax newbie. I recently purchased a 2015 Silverado 2500 w/lml which served as a work truck for my company. I was able to get it super cheap due to them suspecting it had a failing CP4. When I drove it home I noticed that the engine would shudder and RPMs bounced at 1200...
  4. 11-16 LML Duramax Powertrain
    I just experienced a few days of hard starting at 25 degs. I was going through a fuel priming cycle to see if I had air or gelled diesel. It looks like my fuel filter housing has a leak because i see fuel and air bubbles when I push the priming pump with the bleed valve closed. If I was sucking...
  5. 2011-2016 (Non Powertrain)
    Man I am honestly impressed. Went to change the screen for my inlet valve on the CP4 Today and after 170k miles this is what it looks like with a lift pump on the truck from the beginning. Not gonna say a lift pump saves your fuel pump but I will agree it helps it a ton along with good fuel and...
  6. 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...
  7. 11-16 LML Duramax Powertrain
    Hi all; sure hope I'm posting this in the right forum. Please LMK if I should move it elsewhere. First, about the truck: It's a 2015 3500 LT w/ ~295k miles. It has an EFI tow tune and EGR delete (done by previous owner) and a lift pump (done by me), otherwise its stock. Spent its previous...
  8. 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.
  9. 11-16 LML Duramax Powertrain
    I have a 2013 and about 2 weeks ago i had the p0191 code and i replaced the the FPr2 on the LH fuel rail it cleared the p0191 code and then a few days later the check engine light came back on and started throwing the P0087 code i haven't noticed any changes in performance or this all started...
  10. General Discussion
    I have this GM extended warranty on my 15 GMC 2500 LML. I'm curious if anyone has had this warranty and made a claim for a CP4 failure. I would like to know if they covered the entire repair (replace/clean entire fuel system) or just replacement of the pump.
    cp4
  11. 11-16 LML Duramax Powertrain
    hello everyone I just purchased a 2015 LML Duramax with 160,000kms (about 100,000 miles) it is bone stock, one previous owner didn't do anything just normal maintenance. I don't know too much about diesels as this is my first diesel truck. I have done a lot of research and am now a bit worried...
  12. 2011-2016 (Non Powertrain)
    I'm embarrassed to admit that I live in Southern California, but it's true, at least for a little longer. My 2012 GMC CCSB LML is approaching 100,000 miles and I tow a 5th wheel on both short and long family road trips several times a year. I've decided to go ahead and address the faulty CP4.2...
  13. 11-16 LML Duramax Powertrain
    2012 2500 LML, 190k miles PPEI 150hp tune, deleted, EGR completely removed, FASS 150 Replaced low pressure elbow into CP4 and low pressure line to low pressure schrader valve test port 6 months ago when it had a fuel leak into the valley Driving home last night, "Check Fuel Filter" light came...
  14. General Discussion
    Hi all, New to the forums here, and new to duramaxs. I am looking to buy my first diesel, and found a pretty clean looking 1 owner '15 with 145K miles. The carfax is completely clean, except that it looks like the injectors were replaced at 75K miles. My question is, would this most likely be...
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