It isn’t easy keeping your fleet or commercial trucks up and running. At Mr Diesel & Auto Repair in Cheyenne, WY, we’re here to help. Fleet and commercial vehicles log a lot of miles, and a lot of hours - as a result, even the most reliable components need to be serviced occasionally. On an ordinary diesel, an injection pump may last the entire life of the engine itself. On vehicles that work harder than anything else on the road, this isn’t always the case.