3075537 PT Fuel Pump — Pressure-Time Injection for Cummins KTA30 / KTA50 Excavator Engines The 3075537 PT fuel pump is a pressure-time injection pump built for the large-bore Cummins K family. The base figure covers a dozen engine ratings, and the two letters printed after it decide whether the pump suits a generator, a marine set or a haul truck. This page explains what those letters do, lists the cross figures buyers arrive with, and states what must be checked before the