Ram CP3 swap
This article will mainly interest RAM 6.6 owners but it does mention the CP4 bypass for Ford 6.7 owners at the end. It is about swapping the CP4 for a CP3 as a precautionary measure
Forum Discussion
25 Replies
IdaD wrote:
ShinerBock wrote:
IdaD wrote:
Idiotic move by Cummins to use the CP4 in their 2019+ engines.
The Duramax is the smart diesel to get now, even with the DEF tank hanging off the frame like an ugly buck tooth.
The Denso HP4 is not without it's issues either in the medium duty world. We have had some HP4 issues come through our Hino and Isuzu dealerships.
The CP3 isn't without issues either, but it doesn't grenade the fuel system when it dies. How is the Denso in that regard?
All HPFP send out metal fragments with they fail from roller to cam contact. However, the issue with the first version of the CP4 was more prone to this type of failure due to its cam profile and the filter on the MPROP valve would delim from valve leaving no filtering between the pump and injectors when it fails. Both issues are supposedly fixed with later versions of the CP4. I am still skeptical although I have not seen these issues arise with the updated CP4.
How the manufacturer routes the fuel lines also has an impact on whether or not metal particles will get to the rest of the fuel system. If you allow the same fuel that lubricates the pump go directly to the injectors without being filtered, then you will have these issues. If you block off this fuel sending it back to the tank only feeding the injectors with fuel that ran through the filters and lift pump, then the filters will catch any metal big enough to be an issue.
As far as the HP4, we have had to replace fuel systems on Isuzu trucks, but have not had to on Hino trucks from what I have seen.ShinerBock wrote:
IdaD wrote:
Idiotic move by Cummins to use the CP4 in their 2019+ engines.
The Duramax is the smart diesel to get now, even with the DEF tank hanging off the frame like an ugly buck tooth.
The Denso HP4 is not without it's issues either in the medium duty world. We have had some HP4 issues come through our Hino and Isuzu dealerships.
The CP3 isn't without issues either, but it doesn't grenade the fuel system when it dies. How is the Denso in that regard?IdaD wrote:
Idiotic move by Cummins to use the CP4 in their 2019+ engines.
The Duramax is the smart diesel to get now, even with the DEF tank hanging off the frame like an ugly buck tooth.
The Denso HP4 is not without it's issues either in the medium duty world. We have had some HP4 issues come through our Hino and Isuzu dealerships.- Idiotic move by Cummins to use the CP4 in their 2019+ engines.
The Duramax is the smart diesel to get now, even with the DEF tank hanging off the frame like an ugly buck tooth. - Think you meant to say GM 6.6 owners???
