This document provides instructions for removing and installing a fuel priming pump on a Caterpillar D4E track-type tractor with a 3304 engine. The removal procedure involves turning off the fuel supply line valve, removing bolts and washers to detach the pump from its base, disconnecting a tube assembly, and removing two bolts to detach the base from the cylinder block. The installation procedure is the reverse of removal. Proper cleanliness and containment of fluids is emphasized.