Eliminate the ticking time bomb in your 2011–2016 GM 6.6L LML Duramax fuel system with the Fleece Performance CP3 Conversion Hardware Kit (Without Pump) (FPE-LML-CP3-NP). Engineered for truck owners who already have a Bosch LBZ/LMM CP3 or plan to run a custom stroker pump, this complete installation kit replaces the failure-prone factory CP4.2 high-pressure pump with the legendary reliability of the CP3 platform. Best of all, this kit is 50-state CARB emissions compliant (EO #D-834-1) and requires no custom tuning or FCA table changes when paired with a stock-displacement CP3 pump.

Ditch the CP4.2 Before It Takes Out Your Entire Fuel System The Bosch CP4.2 high-pressure fuel injection pump installed from the factory on 2011–2016 Chevy Silverado and GMC Sierra 6.6L LML Duramax trucks is notorious for catastrophic cam and roller failure. When a CP4.2 grenades, it sends fine metal debris directly into the fuel rails, injectors, lines, and tank—often resulting in an $8,000 to $12,000+ repair bill.

The Fleece FPE-LML-CP3-NP Conversion Kit gives you every bracket, line, harness, and fitting needed to bolt a proven Bosch CP3 injection pump directly into the valley of your LML Duramax. Because this is the no-pump hardware kit (-NP), it is the ideal solution if you already have a good LBZ/LMM CP3 pump on the shelf or are pairing the kit with an upgraded 10mm or 12mm stroker CP3 for high-horsepower fueling.

OEM-Quality Fitment, Molded Hoses & Zero Tuning Required Unlike pieced-together conversion kits that rely on generic bulk fuel hose prone to kinking in the engine valley, Fleece Performance engineered exclusive preformed, custom-molded fuel feed and return lines for a clean, factory-grade fit. High-flow CP3 feed and return fittings ensure unrestricted fuel delivery whether you are running a stock setup or an aftermarket frame-mounted or in-tank lift pump.

When installed with a stock-displacement LBZ/LMM CP3 pump, no ECM tuning or Fuel Control Actuator (FCA) regulator table calibration is required. Your truck retains all factory emissions equipment, including the 9th injector (hydrocarbon dosing system), and remains 100% street legal across all 50 states under CARB Executive Order #D-834-1.

Key Features & Benefits

• Prevent Catastrophic CP4 Failure: Converts the vulnerable LML CP4.2 system to the bulletproof, high-volume Bosch CP3 platform.

• Hardware-Only Kit (No Pump Included): Built for owners supplying their own stock LBZ/LMM CP3 or aftermarket performance CP3 pump.

• No Tuning Required: Runs seamlessly on stock ECM calibration with zero FCA table changes needed when using a stock-displacement CP3.

• 50-State CARB Compliant: Retains all factory emissions and SCR/DEF dosing connections (CARB EO #D-834-1 / SEMA Certified SC-FLC01-0013).

• Fleece-Exclusive Preformed Hoses: Custom-molded valley feed and return hoses eliminate routing kinks and rubbing.

• High-Flow Fuel Fittings: Maximizes fuel volume to the pump; fully compatible with factory fuel routing or aftermarket low-pressure lift pumps.

• Protected Design: Covered under US Patent D1023736 and Fleece Performance's 1-Year Limited Parts Warranty.

Technical Specifications

• Manufacturer Part Number: FPE-LML-CP3-NP

• UPC / GTIN: 670875717640

• Engine Platform: 2011–2016 GM 6.6L LML Duramax

• CP3 Injection Pump Included: No (Hardware & Plumbing Kit Only)

• Recommended Pump Style: Bosch LBZ / LMM CP3 (Part # 0445020105) or LML-specific Stroker CP3

• ECM Tuning Required: No (When used with a stock-displacement CP3 pump)

• Emissions Compliance: 50-State Legal (CARB EO #D-834-1)

• Warranty: 1-Year Limited Manufacturer Warranty

What's Included in the Box

• (1) Billet CP3 Block Mounting Adapter with O-Ring Seal

• (1) CP3-to-Rail High-Pressure Hard Fuel Line

• (1) Set of Fleece Preformed / Molded Fuel Feed & Return Hoses

• (1) Low-Pressure Valley Fuel Feed Line

• (2) High-Flow CP3 Feed & Return Fuel Fittings with Sealing Washers

• (1) 9th Injector (Dosing Injector) Distribution Block, Feed & Return Lines

• (1) FCA (Fuel Control Actuator) Regulator Extension Harness

• (1) Fuel Temperature Sensor Mounting Bracket

• Complete Installation Hardware Kit (Mounting bolts, O-rings, clamps, and fuel rail nut)

Vehicle Fitment & Installation Notes

• 2011–2016 Chevrolet Silverado 2500HD / 3500HD – 6.6L LML Duramax Turbo Diesel

• 2011–2016 GMC Sierra 2500HD / 3500HD – 6.6L LML Duramax Turbo Diesel

• Fits Model Years: 2011, 2012, 2013, 2014, 2015, 2016

• CP3 Pump Not Included: You must supply your own Bosch CP3 injection pump (2006–2010 LBZ/LMM style CP3 recommended).

• Lift Pump Compatibility: Can be installed on trucks with a factory fuel system or paired with an aftermarket low-pressure lift pump (such as a Fleece PowerFlo in-tank pump, FASS, or AirDog).