CP3 Pump

The LLY CP3 pump category is about high-pressure fuel supply, not the entire LLY fuel system. A weak CP3 can cause low rail pressure, long cranking, and power loss, especially when injectors or regulators are already worn.

Stock replacement CP3 pumps, upgraded CP3 pumps, regulators, install parts, and related high-pressure fuel components support 2004-2005 6.6L GM Duramax LLY fuel repairs and upgrades. Check return rates and supply pressure before assuming the pump is the only problem.