Revert to a more dependable era, when your Duramax fuel system functioned as expected. Initially, from 2001, all Duramax engines were equipped with a reliable Bosch CP3 high-pressure fuel pump. However, in 2011, GM introduced significant changes, switching to a Bosch CP4 pump that has encountered several issues. The CP4 pump is prone to catastrophic failure, leading to extensive fuel system replacement costs exceeding $10,000. Avoid this expensive repair by retrofitting your LML Duramax to a CP3 using BD Diesel's conversion kit. This kit includes all necessary components and does not require tuning.