Product Description
Stop CP4 failures before they start. The S&S Diesel Motorsport LML CP3 Conversion Kit (W/O PUMP) replaces the failure-prone CP4.2 with proven CP3 hardware for competition/off-road use only on 2011–2016 GM Duramax 6.6L LML trucks. This kit is ideal when you already have, or plan to select, your preferred CP3 pump size.
Fitment
- 2011–2016 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD – 6.6L Duramax LML (VIN 8)
- Use: Competition / off-road only (not CARB-exempt). For emissions-compliant daily use, see 50-State LML CP3 kits with pump.
What’s Included
Complete CP3 conversion hardware minus the high-pressure pump, including model-specific brackets, lines/fittings, and install components engineered for LML packaging. Detailed installation instructions are provided by S&S. (Exact contents may vary by revision.)
Recommended Parts (Internal CPP Links)
- S&S DURAMAX CP3 PUMP (choose displacement for your power goals)
- LML CP3 HIGH-PRESSURE FUEL LINE (if not included / as needed)
- LIFT PUMP (AirDog/FASS) for consistent supply (recommended on higher output)
- FUEL FILTRATION & MAINTENANCE PARTS
- MORE S&S DIESEL DURAMAX COMPONENTS
Helpful Notes
- Choose your CP3 pump size (e.g., 10mm/12mm/high-speed) to match injector and power goals.
- Competition kits are not emissions-compliant; tuning/calibration requirements depend on pump/injector choice and vehicle setup.
- Inspect the entire fuel system after CP4 failure; contamination can damage rails, lines, and injectors.
No. This is the W/O PUMP kit. Pair it with your choice of S&S CP3 pump above.
FAQ: Is tuning required?Competition setups may require calibration depending on pump size and build. For emissions-compliant daily use, consider the 50-State kit with pump.
FAQ: Is this kit street legal?No. This W/O PUMP kit is labeled for competition/off-road use only. For 50-state legal use, select the CARB-exempt S&S LML CP3 kit with pump.
FAQ: What CP3 size should I choose?Mild builds typically use a stock-sized or 10mm pump; larger injectors/turbo setups benefit from 12mm or high-speed variants. See our S&S CP3 pump options and contact CPP Diesel for guidance.
FAQ: What else should I replace after a CP4 failure?Inspect/replace contaminated components (injectors, rails, lines, filters). We stock complete fuel-system components for LML—see links above.
