The fuel injection pump on my 1995 failed several years ago. The truck was towed to the Dodge dealership that sold the truck. They had it towed to Cummins Cincinnati where the work was performed.
The system works as stated here. Your warranty starts with Dodge, so you have to contact them first. The dealership may have Cummins do the work for any number of reasons. The dealership may not have a qualified diesel mechanic, or that mechanic may be busy with a different job. It may be cheaper for Dodge to contract the work out rather than do it in-house. Also, it may be that Cummins is paying Dodge for the warranty work and it's simpler for Dodge just to deliver the truck to Cummins and let them do it.
In my case, I got a brand new injection pump plus a tune-up from Cummins. The truck's replacement pump was set up better than the factory one, either with better timing or more fuel flow or both. My mileage improved after the replacement. I was very happy with the work.
Loren
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2000 Quad Cab, 4x4, short bed, six-speed: U. S. Gear exhaust brake, MileMarker Select Drive viscous coupling, Velvet-Ride spring shackles, Painless Wiring circuit box, Optima yellow-top batteries, Super-Glide 5th wheel hitch, Reese folding ball gooseneck hitch, Drawtite front hitch receiver, Tekonsha Sentinel brake controller, Westin nerf bars, Clarion sound system
1995 Standard Cab, 4x4, long bed, automatic: Firestone Ride-Rite air springs, torque converter lock-up switch, 4" cat-back exhaust, Reese 20K 5th wheel hitch, Reese gooseneck hitch, Hayes Micro Control trailer brake controller, 100 gallon bed-mounted fuel tank with 12 volt electric pump & fill nozzle, Swiss Cap fiberglass cap