CP4 Fuel Pump Silverado Sierra Lawsuit USA: The Duramax Diesel
CP4 Fuel Pump Silverado Sierra Lawsuit USA What is the CP4? The Bosch CP4 (also called CP4.1 or CP4.2) is a high-pressure common-rail fuel injection pump. GM introduced it in the 2011 Duramax LML 6.6L diesel engine, replacing the more robust Bosch CP3 pump that had powered previous Duramax engines (LB7, LLY, LBZ, LMM). Why Does It Fail in U.S. Trucks? The CP4 was originally engineered for European diesel fuel, which has a higher lubricity (slipperiness) than U.S. Ultra-Low Sulfur Diesel (ULSD). The CP4…









