*Discontinued* 2011-2016 Duramax Emissions Compliant CP3 Conversion Kit w/ CP3 (FPE-LML-CP3-FF-EO)-CP3 Conversion Kit-Fleece Performance-FPE-LML-CP3-FF-EO-Dirty Diesel Customs

*Discontinued* 2011-2016 Duramax Emissions Compliant CP3 Conversion Kit w/ CP3 (FPE-LML-CP3-FF-EO)

Fleece Performance

Part Number: FPE-LML-CP3-FF-EO

Mfr Part Number:

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This Product has been Discontinued

Please click here for an updated version.

Fits: 2011-2016 GM LML w/ 6.6L Duramax

Convert your 2011-2016 Duramax's fuel system from a CP4 to a CP3 high-pressure pump and get performance and peace-of-mind. Since its introduction, the CP4 has proven to be less reliable and less capable than the CP3 used in previous Duramax platforms. Fleece's newest kit includes all of the hardware necessary to replace the troublesome CP4 with a CP3 and requires no tuning changes and maintains all factory emissions controls.

Fleece Product Number: FPE-LML-CP3-FF-EO

  • CP3 Pump
  • Billet CP3 Engine Block Adaptor
  • High-Pressure Fuel Rail Line
  • Low-Pressure Fuel Feed Line
  • Return Fuel Hose
  • CP3 Feed Hose
  • Fuel Rail Nut
  • (3) CP3 Block Adapter Bolts (Flange Head, M8x1.25x35mm)
  • CP3 Pump Fittings – 3/8”
  • CP3 Pump Fittings – 1/2"
  • (2) 12mm Sealing Washers
  • No tuning changes
  • Maintains all factory emissions controls


Ask a Question
  • Hi I had a question about a LML Cp3 conversion if the fuel system is still good can I just spend $3-4k to convert it now or do I have to wait for it to blow up and then spend the 7-10k?

    You could definitely be proactive and do the conversion right away. However, if you decide to stay with the CP4, we recommend that you consider installing a Fuel System Saver.

    We also wrote up an article that gives some good information on this topic. 

    Click here to view the CP4 Injection Pump Failure Article

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