CP4 pumps can’t handle ULSD! Never should have been used here. New ones now going back to CP3 pumps.I can relate. The truck in my profile pic is at a dealer 900 miles from home with a failed cp4 injection pump. I'm out about 200 in fuel, 2k from the load I was headed to pick up, several days hotel, rental car and fuel to get home, and so far 2 weeks loss of use (which equates to another 4k lost gross income).
Thankfully just a side gig for me.
I contacted Ram on the advice of the dealership service manager and opened a case. Parts are expected Tuesday. I recommend you call the 800 number to Ram customer service if you haven't already. I don't think the fact you bought it used/private sale matters here.
That is great news.Lol, sorry guys, I'm back! So yeah, truck is running beautifully. We've got about 400 miles on the new engine now. Trying to take it easy until we get to that 500 mi mark. It did use a quart of oil right off the bat, but the dealer was great and topped it off again for nothing. We'll have to keep an eye on that to make sure it isn't an issue, but overall so far so good. Very grateful that the dealer went to bat for us and lit a fire under Mopar.
Oh, one more funny story. After the dealer got the approval for the repair, they ordered the engine and it came in BROKEN. So that was part of the delay, waiting for engine #3. Can't make this up. Thankfully they were able to get another one in right away.
P.S. We get about 3-4 mpg more with this new engine. Apparently it uses fuel better when all cylinders are firing! Imagine that.