CP3 Pumps

Restore factory fuel delivery performance, eliminate low-rail-pressure DTCs, and support high-horsepower engine builds on your 2004.5–2005 Chevy Silverado or GMC Sierra 2500HD/3500HD with our selection of LLY Duramax CP3 injection pumps. The CP3 high-pressure pump is the heart of the common-rail fuel system; over time, internal vane wear and regulator degradation cause an inability to maintain desired rail pressure under load, leading to sluggish power, stalling, and reduced fuel economy. Whether you need a reliable, drop-in remanufactured stock CP3 for a daily-driven work truck or a high-flow "stroker" pump designed to provide the volume necessary for massive aftermarket injectors and performance tuning, we have you covered. We supply genuine Bosch OEM pumps, precision-machined performance CP3s, and complete pump-to-rail install kits from industry-leading manufacturers like Bosch, S&S Diesel Motorsport, Fleece Performance, and Industrial Injection. Browse our complete inventory of 6.6L LLY CP3 injection pumps below to restore consistent high-pressure fueling and peak engine performance.