S&S Diesel Motorsports LML-CP3-NO-TUNING-REQ CP3 Conversion Kit with Pump

The S&S Diesel Motorsports LML CP3 Conversion Kit provides a proven solution to the notorious CP4.2 high-pressure fuel pump failures that plague 2011-2016 LML Duramax engines. This competition-use kit replaces the failure-prone CP4.2 pump with a bulletproof Bosch CP3 high-pressure fuel pump, eliminating the risk of catastrophic fuel system damage before it occurs.

Key Features:

• Complete drop-in conversion kit with CP3 pump included
• No tuning required - custom metering unit matches CP4 flow curve
• Works with already-tuned trucks without ECM recalibration
• Competition use only - designed for vehicles without DPF/after-treatment
• Prevents costly damage to injectors, rails, and fuel lines from CP4 failure
• Includes all necessary hardware for complete installation
• Compatible with 2011-2016 Chevrolet Silverado and GMC Sierra 2500/3500 with 6.6L LML Duramax

The CP4.2 high-pressure pump is widely recognized as the weak point of the LML Duramax platform, with high failure rates that commonly destroy the entire high-pressure fuel system. This conversion kit uses a tried-and-true CP3 pump design that has proven its reliability across countless diesel applications. The custom metering unit is specifically engineered to replicate the CP4's flow characteristics, allowing installation without any tune modifications.

What's Included:

• Bosch CP3 high-pressure fuel pump
• Custom metering unit designed for LML platform
• All mounting brackets and hardware
• High-pressure fuel lines
• Installation instructions

Important Note: This is a competition-use kit intended for off-road vehicles that have had emissions equipment removed. It is not CARB-compliant and cannot be used on street-legal vehicles in emissions-regulated areas.