This feed pump delivers fuel from the tank to the injection pump at the required pressure and flow rate for engine operation. It is mounted on the engine block and is driven by the camshaft or an intermediate gear; the pump's internal mechanism draws fuel through the primary filter and pushes it through the secondary filter before it reaches the high-pressure injection pump. A failing feed pump causes hard starting, low engine power, or stalling under load because the injection pump cannot draw enough fuel on its own. This component is manufactured to the original assembly's dimensional and flow specifications, so it maintains the correct pressure curve that the injection pump's governor relies on for consistent fueling.