Is this normal?

[JimT]

The 2 piston vs 3 piston fuel pumps mean nothing. They stopped shipping the 3 piston pumps pretty early on in the 2250's production. My 2250 was built in late 2011 with a 2 piston fuel pump. The ceramic plungers however were present much longer (at least into some 2013 builds). But, like Rawze said, ALL the common rail pumps (2010 and up) are basically identical and all are prone to suffer complete internal failure over time. Most failures occur some time beyond 400,000 miles (roughly 8,900 engine hours). Sometimes 450k, 550k, 650k. 400,000 miles seems to be a safe target for regularly scheduled rebuilds of the fuel pump head. Personally, I'd take the approach of opening up the head ever 100-200k mi to look for excessive wear. Just be sure to clean the area really well before hand so you don't introduce dirt into the system.

Finally, I don't think they sell rebuild "kits" anymore. Check out cummins quickserve or parts.cummins.com for the correct rollers, tappets and barrels and plungers. Last I checked you're looking around $500 in parts. Grab a new $15 gasket too (though I've been told they can be reused I personally would just replace it and not take the chance)