11-16 6.6L LML Duramax Fleece CP3 Conversion Kit

2011 – 2016 6.6L LML Duramax CP3 Conversion Kit


2011 – 2016 6.6L LML GM / Chevrolet Duramax Diesel CP3 Fuel Pump Conversion Kit

Fleece Performance Engineering #

    • CP3 Conversion Kit without CP3 Fuel Pump
  • FPE-LML-CP3-WP *Our Recommended Kit for 6.6L CP3 Conversion*
    • CP3 Conversion Kit with Fleece Performance CP3K Fuel Pump
    • 50 – State Emissions Compliant EO# D-834-1
  • FPE-LML-CP3-FF-10
    • CP3 Conversion Kit with Fleece Performance PowerFlo 750 CP3 Pump
    • Not Legal for Sale or Use in the State of California

Convert your LML’s Fuel System from a CP4 to a CP3

Improve your LML Duramax’s reliability and fueling capability with a CP3 conversion. Since its introduction, the CP4 has proven to be less reliable and less capable than the CP3 used in previous Duramax platforms. Failures of the CP4 are extremely costly and require replacement of the entire fuel system. Avoid a costly failure down the road and convert your CP4 to a CP3 on the 2011-2016 LML Duramax platform. Our LML CP3 converstion kit provides you with OEM fit-and-finish features like our Fleece Performance exclusive molded hoses for the fuel feed and return, high flow CP3 fuel fittings, and our valley feed line to support aftermarket lift pump applications.


  • High flow CP3 feed and return fittings
  • Preformed feed and return fuel lines

Kit Contents:

  • CP3 to rail high pressure fuel line
  • High flow CP3 feed and return fuel fittings
  • Preformed feed and return fuel lines
  • CP3 mounting adapter
  • Dosing injector feed line
  • FCA extension harness
  • Fuel temperature sensor mounting bracket
  • Low pressure fuel feed lines
  • Hardware kit

No FCA regulator table changes are required when converting from the CP4 to a stock CP3 when using this kit

Note: If you are purchasing the Conversion Kit without the Fuel Pump we recommend use of a New or Modified Performance CP3 to ensure proper fuel output is maintained.

No Core Return Required

Additional information

Weight 3 lbs
Select Options

CP3 Conversion Kit Without CP3 Pump, CP3 Conversion Kit with CP3K Pump, CP3 Conversion Kit With PowerFlo 750 CP3