Fleece FPE-LML-CP3-NP CP3 Conversion Hardware Kit | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Converts LML CP4 system to reliable CP3
  
• Eliminates risk of CP4 failure
• Supports improved fueling capabilities
• Includes high flow CP3 fuel fittings
• Comes with preformed feed and return lines
• Compatible with aftermarket lift pump setups
• Includes CP3 to rail high-pressure fuel line
• OEM-quality mounting and bracket components
• Installs without tuning or regulator changes
• Perfect for reliability and performance upgrades
  

Protect Your Fuel System Before It Costs You Thousands

If you drive a 2011–2016 Duramax LML, then you’ve probably heard about the dreaded CP4 failure, and if not, you’ll want to pay attention. The CP4 pump is notorious for self-destructing and taking the entire fuel system with it, leaving you with a massive repair bill and a truck stuck in the driveway. This kit allows you to convert from the problematic CP4 to the proven reliability of the CP3 without the need for tuning or software adjustments. The hardware is top-shelf, from preformed fuel lines to high-flow fittings, all built for durability and ease of installation. Whether your truck is a workhorse, tow rig, or daily driver, this upgrade gives you peace of mind knowing your fuel system is secure. It’s a serious solution for any LML owner who wants to avoid the risk and drive with confidence.

Engineered For Clean Fitment And Long Term Reliability

The Fleece FPE-LML-CP3-NP CP3 Conversion Hardware Kit is precision-engineered for the 2011–2016 GM 6.6L Duramax LML platform and includes all the hardware you need to swap out the CP4 pump for a stock-style CP3, minus the pump itself. The kit is 50-state compliant under EO Number D-834-1 and includes a CP3 mounting adapter, high-pressure fuel line to the rail, and a full set of preformed feed and return fuel lines that match OEM routing for a clean installation. You’ll also find high-flow CP3 fuel fittings, a dosing injector feed line, and a fuel temperature sensor bracket, all designed for high durability and exact fitment. Fleece’s exclusive molded hoses ensure long-term resistance to pressure, vibration, and heat, while the FCA extension harness ensures plug-and-play compatibility. What makes this kit especially convenient is that no FCA table changes or tuning is required when using a stock CP3 pump, which keeps things simple for everyday users and professional installers alike. This conversion is a must for those looking to improve reliability while maintaining emissions compliance. Whether you’re prepping your truck for more power or simply want a bulletproof fuel system, this kit has every angle covered.

Fits: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Fits 2011–2016 GM 6.6L Duramax LML engines only
• Kit includes hardware only—CP3 pump not included
• 50-state emissions compliant under EO Number D-834-1
• Eliminates high failure risk associated with CP4 pumps
• Includes CP3 to rail high-pressure fuel line
• Features preformed feed and return fuel lines
• Comes with CP3 mounting adapter and fuel fittings
• Includes FCA extension harness for seamless installation
• Supports integration with aftermarket lift pump systems
• No tuning or FCA table changes required with stock CP3
• Ideal for reliability, performance, and emissions compliance