This fuel filter with an integrated water separator removes solid contaminants and separates water from diesel before it reaches the injection system. The water-separating element collects droplets and settles them in a sump at the base of the housing, protecting the high-pressure pump and injectors from corrosion and abrasive particles. A clogged filter or a full water-collection bowl restricts fuel flow and can cause the engine to lose power or stall. The manufacturer specifies the filter's outer diameter and height to match the original housing dimensions, ensuring the seal seats correctly and the bypass valve operates at the intended cracking pressure. On replacement, drain the water bowl and replace any O-rings or gaskets included with the filter.