Donaldson P550657 Fuel Filter

Fuel Filtration for Heavy-Duty Applications

Donaldson P550657 is a cartridge-style fuel filter and water separator built for heavy-duty diesel fuel systems. It is specified for International WorkStar 7400, 4300, 4300LP, 7400, 7300, 4400, 4400LP, 7500, 8500, and CXT applications across the listed model years.

Key Features

• Cartridge-style fuel filter with integrated water separation.
• 99% efficiency rating at the stated test standard for fine contaminant control.
• 95% emulsified water efficiency for fuel-system moisture management.
• 5.5 collapse burst rating for structural strength under service conditions.
• Primary application reference: Navistar 1842638C91.

Detailed Description

This Donaldson fuel filter, part number P550657, is designed as a cartridge water separator for diesel fuel delivery systems that require both particulate filtration and water removal. The listed dimensions and performance data include a 141.8 length, 3.74 outer diameter, 0.81 inner diameter, and efficiency testing to SAE J1488 and J1985. For buyers servicing International WorkStar 7400 and International 4300 platforms, P550657 provides a direct replacement option aligned with the specified application data.

This part cross-references Baldwin PF7779 and Hastings FF1159 for the same application.

What It Is Used For

• Replacing a clogged fuel filter element in diesel fuel systems.
• Separating water from fuel before it reaches sensitive components.
• Restoring filtration performance when contamination levels rise.
• Addressing fuel restriction caused by a loaded cartridge.
• Supporting maintenance on International medium- and heavy-duty trucks.

Installation Notes and Tips

Verify the application against the vehicle’s existing filter specification and the listed primary application reference before installation. Confirm cartridge dimensions and sealing surfaces match the housing, and follow the service procedure for fuel system priming after replacement. Use clean handling practices to avoid introducing debris into the fuel circuit.

Quality Assurance

Donaldson is a recognized filtration manufacturer with application-specific fuel filter engineering for commercial diesel systems. P550657 is built to the stated efficiency and structural performance standards, including SAE J1488 and J1985 test references.