Fleece Performance 01-13 GM Duramax 6.6L Duramax CP3K (LBZ/LMM Based)

The Fleece Performance CP3K is a high-performance fuel pump upgrade designed specifically for the Duramax LBZ and LMM engines from 2001 to 2013. This modified Duramax LBZ CP3 addresses the factory fuel flow restriction that begins at 3,000 RPM, which causes a loss of fuel flow and rail pressure, leading to decreased horsepower when maximum power is needed. Constructed as a cost-effective solution, the CP3K allows for consistent fuel rail pressure throughout the entire RPM range, enhancing engine performance and reliability. Its design ensures improved fuel delivery, supporting increased horsepower and torque, especially during high-demand conditions.

This product is compatible with 2001-2013 GM Duramax 6.6L engines, including LBZ and LMM models. It is intended as a direct replacement or upgrade for stock CP3 pumps, with the note that the fuel pressure regulator must be scaled appropriately when installed in 2001-2005 models (LB7 or LLY). The CP3K is ideal for performance enthusiasts seeking to maximize power output across the RPM spectrum, whether for towing, daily driving, or racing applications. Installation is straightforward for those familiar with Duramax fuel systems, making it a reliable choice for improving fuel delivery and engine response.