With the success of the P7100 injection pump in the 5.9L Cummins engine and beyond, custom P-pumps have started popping up. These modded P-pumps can increase the engine's cubic capacity and horsep ...

Failing CP4 injection pumps often present similar symptoms ... If your truck is powered by an LML Duramax or 6.7L Cummins, you could replace the CP4 pump by using a CP3 conversion kit from S ...