This engine fuel filter removes particulate from the fuel supply before it reaches the injection pump. It mounts in the fuel line between the tank and the high-pressure pump, where its media traps water and debris that would otherwise score injector components. A clogged filter restricts fuel flow, causing power loss and hard starting, and can force the bypass valve open, allowing unfiltered fuel downstream. The manufacturer machines the sealing surfaces to match the original housing, ensuring the bypass valve seats at the correct cracking pressure. On replacement, drain any water from the bowl and tighten the housing to the specified torque.