2021 Ram 3500 H.O.

4x4ord wrote:
Does Cummins use the same pump as Powerstroke cuz I just read that the Cummins has a 29000 psi fuel delivery system where as Ford claims they went to 36000 psi for 2020? I think both use the Bosch 4.2. How does that work?

Edit: Upon doing further google searches I found evidence of a CP4.2 pump failure in a 2020 Ford. Even if the pump has been changed for 2020 it sounds as though it’s still a POS. It seems almost unbelievable that Ford would stick with Bosch even if the number of failures are rare the damage these failing pumps do to the Powerstrokes reputation has got to be costly to Ford.

I'm not 100% certain, but I believe it is the same pump. They have made changes to them since they first appeared in the Ford and GM in 2011 which has improved the reliability, but it is still a crapshoot and is one of the major reasons I bought a Cummins with the trusty CP3 pump. I can't say I'm surprised that they are failing on the 2019 and up Cummins engines.

I work with a guy who had it happen on his 2012 F350; the truck was just outside of engine warranty mileage and Ford was going to stick him for the entire cost of the repair so he traded it while it was still in the shop on a 6.2L truck. He was not happy about it but was caught between a rock and a hard place. It may not be as common of a problem that it once was, but it still really sucks if it happens to you, especially if you end up footing the bill. If I were shopping for a new diesel truck right now it would almost certainly be a GM because they switched to a Denso pump.