Fleece FPE-LML-CP3-NP | LML Duramax CP3 Conversion Hardware Kit (No Pump) | 2011-2016 GM 6.6L Duramax

Eliminate the Weakest Link in Your LML Fuel System

The CP4 high-pressure fuel pump in the 2011–2016 LML Duramax is well-known for catastrophic failures. When it fails, metal debris often contaminates the entire fuel system — rails, lines, and injectors — leading to extremely expensive repairs.

The proven solution is converting to the legendary Bosch CP3 pump used in the highly regarded LBZ and LMM Duramax platforms. Fleece Performance developed this premium conversion kit to deliver OEM-level fit and finish while significantly improving reliability and fueling capability.

This is the "No Pump" (NP) version of the kit. It includes every adapter, hose, fitting, and piece of hardware you need to adapt a Bosch CP3 (LBZ/LMM) to your LML — but does not include the CP3 pump itself. Perfect if you already have a good pump, want to reuse one, or plan to pair it with a specific performance pump.

Key Benefits

• Avoid costly CP4 failures and the resulting fuel system contamination
• Gain the proven reliability and higher fueling capacity of the CP3 platform
• OEM-quality fit and finish with Fleece-exclusive preformed/molded hoses
• High-flow CP3 feed and return fittings
• Supports aftermarket lift pumps (valley feed line provisions included)
• Fully emissions compliant — maintains all factory emissions equipment
• No tuning or FCA table changes required when using a stock CP3 pump

Kit Contents

• CP3 mounting adapter (block adapter with O-ring)
• Preformed fuel feed and return hoses (Fleece exclusive design)
• High-flow CP3 feed and return fittings with sealing washers
• CP3-to-rail high-pressure fuel line
• Dosing injector (SCR/DEF) distribution block, feed, and return lines
• FCA (Fuel Control Actuator) extension harness
• Low-pressure fuel feed line
• Complete hardware kit (bolts, O-rings, clamps, fuel rail nut, etc.)

Vehicle Fitment

• 2011–2016 Chevrolet Silverado 2500HD / 3500HD
• 2011–2016 GMC Sierra 2500HD / 3500HD
• 6.6L LML Duramax

Important Notes

• CP3 pump is NOT included — You must supply your own Bosch CP3 (LBZ/LMM style recommended)
• Designed for use with or without a low-pressure lift pump (observe proper feed pressure recommendations)
• 50-state legal — CARB Executive Order #D-834-1
• Estimated professional installation time: 12–14 hours
• 1-Year Limited Parts Warranty from Fleece Performance
• Protected under US Patent D1023736 and Patents Pending

This kit is ideal for LML owners who want maximum reliability without being forced into a complete “with pump” package. Pair it with one of our CP3 pumps, lift pumps, or upgraded fuel filtration systems for a complete, bulletproof fuel system.