S&S Diesel Motorsport CP3-CU-12 – New 12mm CP3 High-Pressure Fuel Pump for 5.9L & 6.7L Cummins

Unlock serious, reliable fueling for your 2003–2018 Ram 2500/3500 Cummins with the S&S Diesel Motorsport CP3-CU-12. This is a brand-new (not remanufactured) 12mm stroker CP3 built on the robust 6.7L architecture and internally modified by S&S for efficient, consistent fuel delivery across a wide RPM range.

Key Advantages

• 1,590 mm³/rev displacement (12mm) – significantly more flow than a stock CP3 while maintaining drivability.
• Internally optimized by S&S so the pump continues delivering fuel efficiently well past the point where a stock pump falls off (typically around 3,000–3,500 rpm). Supports stable fueling into the mid-4,000s rpm range.
• Proven single-pump capability up to approximately 1,000 hp when paired with supporting injectors, tuning, and adequate supply pressure.
• Brand-new construction with a data sheet included in the box for proper calibration.
• 2-year manufacturer warranty and no core charge.

Fitment

• 2003–2007 Ram 2500/3500 with 5.9L Cummins 24V common-rail
• 2007.5–2018 Ram 2500/3500 with 6.7L Cummins 24V

Important install note: All S&S Cummins CP3 pumps are based on the 6.7L housing. When installing on a 2003–2007 5.9L, minor high-pressure fuel line/fitting modifications (or a dedicated adaptation kit) are required.

Recommended Supporting Mods

• Quality lift/supply pump (150 GPH or higher strongly recommended)
• Proper custom tuning
• Matching injectors and fuel system components for your power goals

This pump is the go-to single-CP3 upgrade for street, tow, and performance builds that need more fuel than stock can provide without jumping to dual-pump complexity. California shipping restrictions apply.

Ready to fuel harder and more consistently? The S&S CP3-CU-12 delivers the volume and high-rpm stability your Cummins needs.