GM used the pump on its 6.6-liter LGH and LML Duramax diesel engines through 2016, opting to use the Denso HP4 pump on the L5P Duramax ... they used the CP3 version. While it was heavier and ...

Before GM introduced its L5P turbodiesels, there was a standout ... A Step-By-Step Guide GM switched from a CP3 pump used in previous engine iterations to the CP4 in the LML so that drivers ...