Mar 24, 2025 · We also know from the Ford 6.7 vs GM LML situation, the CP4 survivability tended to be better with good filtration and lift pumps. Both of those are present, so just like on the Fords, it should …

Feb 10, 2025 · My dealership preformed the recall to change out the High-pressure Fuel Pump CP4 and install the CP3 on my 2019 Ram 2500 6.7 Cummins with 130K on it. This...

Oct 24, 2022 · I just had the CP4 pump replaced and noticed some oil drips in the garage. Looking around the engine bay, it appears to be power steering fluid and coming from the general area of the …

Dec 9, 2024 · We will see. For all we know, this “CP8” might simply be a cam lobe change and a name change to escape the CP4 hate. I’ve heard many times before that Bosch isn’t the most pleasant to …

Nov 1, 2013 · Had the dreaded ticking noise on my 2019 3500 ram, 245,000 km, went to the dealer, I need you to clean up all the overdue recalls and look into this ticking. Dealer says, its your CP4, and …

Aug 29, 2020 · Hello. I am very new to the RAM forum and have worries about the new Bosch CP4.2 Fuel Pump that is being used on the new High Output Cummins 6.7, in the Ram 3500 Duelly, which I …

Jun 22, 2020 · Bought my First New ram 3500 in August 2019 Here it is June 2020 , 7310 miles later and the cp4 pump went out Truck has Been there for a month , Just Now was told By Chrysler that …

Mar 18, 2021 · I have a 2020 Ram 5500 6.7 Cummins with a build date of 8/20 It has the revised cp4 injection pump with the big dimple on the pump. Ever since we got this truck it makes a loud buzzing …

Dec 28, 2020 · Thanks for your responses. I'll probably keep the CP4 pump up till about the time the basic warranty expires, then I'll purchase a CP4 to CP3 conversion kit to replace it unless Ram or …

Oct 12, 2020 · The design of the CP4 seems to make the failure worse by allowing the fine metal fragments to contaminate the entire system. Pretty much the whole fuel system needs to be …