RIP CM2250, 2013, 800,000km 20,000 hrs

[Hermjeji]

So, an update. It was the fuel pump of death for sure.

These are the revised costs:
1. C15 6NZ - 50K
2. ISX600, used block, reman head (a new head is apparently 6 weeks away, any thoughts on if this is BS or not?), genuine ISX kit, new fuel pump, used crank, between 38-45. Depends on the turbo, the truck has an approx. 3 year old turbo on it, stock turbo. He said he'd check out the turbo (and I will get a second opinion on it, and a few more from here hopefully). Reman head from Cummins, if checked out for flatness, sounds like an acceptable compromise, vs. waiting 6 weeks or more - is there a way to cover the base here with a Reman or is the advice quite literal that they are total garbage?.
3. ISX600, new - 55k (installed) (+20k core, but he's working to get a coreless engine [ie. the Peterbilt dealership will take the core and manage that end of it]

I want to keep the emissions system in tact, and go more through the forum and get it done proper if i do want a delete. This way, I keep the same flash as the original ECM, nothing is tampered with from that respect.

I am a through and through Cat believer, but the comments here are very valid. I am leaning towards option 2.