The K&N PF-4100 is a replacement diesel fuel filter cartridge for the 2003-2007 Ford 6.0L Power Stroke. The manufacturer describes it as an OEM-fit in-line filter that uses high-performance cellulose glass media to trap rust, dirt, and scale before they reach the injection system. K&N also cites low-restriction media and high-capacity pleats as design goals, which matters on a diesel that depends on steady fuel delivery under load. A buyer choosing this filter gets a one-year limited warranty from the manufacturer and a two-pack, so a single service covers both filter positions on the truck.
Fitment is the first thing to confirm. The manufacturer lists the filter for the 2003-2007 6.0L diesel, but published model lists differ on which F-Series Super Duty and Excursion trucks are included, so check your VIN-level application before ordering. This is a good match for owners searching terms like 6.0 Powerstroke fuel filter replacement, 03-07 Super Duty diesel fuel filter cartridge, or cellulose glass media diesel filter upgrade. Because the part is designed to match the factory location, the job is a straightforward swap rather than a modification.
The manufacturer lists the PF-4100 as a diesel truck fuel filter, so it is intended for the 6.0L Power Stroke rather than a gasoline system.
The manufacturer's listed package contents are two fuel filters, one gasket, and one O-ring per box.
The manufacturer lists the 2003-2007 6.0L diesel application, but published model lists vary, particularly for Excursion and the larger Super Duty trucks. Confirm your specific truck with the manufacturer before ordering.
The manufacturer provides a one-year limited warranty on this filter.
The filter is designed as an OEM fit, so it is intended to replace the factory element in the stock location without modification. The box includes the gasket and O-ring needed to seal the housing, so inspect the sealing surfaces and make sure the new gasket and O-ring are seated correctly before tightening. Relieve fuel system pressure and disconnect the battery before opening the housing, and keep a shop towel handy for fuel spillage. Confirm the torque specification for your truck's housing with a service manual, since the manufacturer's listing does not include install torque values.
