S&S Diesel LML-CP3-TUNING-REQ CP3 Conversion Kit with Pump Requires Tune | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Replaces failure-prone factory CP4 pump
• Includes genuine Bosch CP3 for durability
• Supports high-performance fueling demands
• Improves overall fuel system reliability
• Ideal for towing, racing, or heavy use
• OE-style high-pressure fuel line included
• Quick-connect supply line for clean install
• Injection-molded ECU mount fits like factory
• Requires custom tuning for proper function
• Designed for 2011-2016 LML Duramax engines
• Not emissions legal, off-road use only
• All necessary conversion hardware included

Say Goodbye To CP4 Failures For Good

If you own a 2011-2016 LML Duramax, then you already know the factory CP4 pump is a ticking time bomb. When it fails, it doesn’t just quit, it sends metal shavings throughout your entire fuel system, leading to costly repairs and major downtime. The S&S Diesel CP3 Conversion Kit with Pump is the smart upgrade to eliminate that risk and give your truck the reliable fueling it should’ve had from the start. This kit swaps out the weak CP4 for a battle-tested Bosch CP3, known for its strength, longevity, and ability to handle high-pressure demands without breaking a sweat. Whether you’re towing, daily driving, or dialing in more power, the CP3 keeps your fuel delivery smooth and consistent. It’s a bolt-on upgrade that adds peace of mind and unlocks greater potential for your build. Plus, the factory-style fit and included hardware make for a clean install that looks right at home under the hood.

Built To Handle Power Without Breaking Down

The S&S Diesel CP3 Conversion Kit is more than just a replacement, it’s an engineered solution designed for serious performance and long-term durability. At the heart of this kit is a brand-new Bosch CP3 pump, capable of delivering higher fuel volumes with better reliability than the factory CP4 ever could. This kit includes everything needed for a complete swap, including a high-pressure fuel line, OE-style quick-connect fittings, and an injection-molded ECU mount to keep everything secure and factory-clean. Designed specifically for the 2011-2016 GM 6.6L Duramax LML platform, this system supports both daily drivers and high-horsepower builds. Tuning is required to ensure proper function, especially when supporting modified fuel maps or aftermarket injectors. The CP3 is a proven performer in competition-level trucks, making it ideal for anyone looking to push their setup harder without risking system failure. Just note that this product is intended for off-road use only and is not emissions legal for street-driven vehicles in regulated areas.

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

Notes:

• Replaces factory CP4 pump with reliable Bosch CP3
• Designed for 2011-2016 GM 6.6L Duramax LML engines
• Requires custom tuning for correct operation
• Includes all hardware and components for installation
• OE-style quick-connect fittings for clean install
• Injection-molded ECU mount for secure placement
• Supports high-performance and competition-level fueling
• Professional installation is strongly recommended
• Not emissions compliant, for off-road use only
• Not legal for sale or use in California
• Helps prevent costly fuel system damage from CP4 failure
• Backed by S&S Diesel’s limited warranty