Insight in to the HPFP Cummins recall

[vlamgat]

Some interesting stuff here including the differences between the Duramax and Ford issues.

Seems that one of the main reasons for the CP4 failure was incorrect installation of the fuel filter and/or inadequate priming after installation.

https://www.drivingline.com/articles...uel-pump-swap/

[1HasBeen]

Plenty of them failed before the first filter change. Are there contributing/aggravating factors? Yes. Yet, the CP3 survived Dodge/Ram installations with American ULSD, improper filter installs, improper priming, aeration, etc. from 2003-2018, and 2021+. The CP4 is simply a "value engineered" piece of junk.

[bhoth]

Does the 8.9L Cummins have the CP3 or CP4 or does it depend on years?

[1HasBeen]

AFAIK it's a whole different system, so neither one.

[Zoinks]

Originally Posted by bhoth

Does the 8.9L Cummins have the CP3 or CP4 or does it depend on years?

It uses the same Cummins high pressure fuel pump it has for years. Rock solid. It is not a BOSCH fuel pump.