Donaldson P550737 Fuel Filter

Fuel Water Separator Cartridge

Donaldson P550737 is a cartridge-style fuel filter and water separator built for heavy-duty diesel fuel systems. It is used in a wide range of Kenworth, International, and Peterbilt applications where fuel cleanliness and water removal are critical.

Key Features

• Cartridge-style fuel filter and water separator for diesel fuel systems
• Cellulose and silicone media for filtration and water separation performance
• 99% efficiency at 40 microns, tested to SAE J1488 and J1985
• 95% emulsified water efficiency for moisture control in fuel
• Collapse burst rating of 5.5 for demanding service conditions
• Part number P550737 for direct identification and ordering

Application Details

Compatible with Kenworth T680, Kenworth C500, Kenworth T700, and Kenworth T2000, as well as International 9900i, ProStar, 5500i, 5600i, 9200i SBA, 9900ix, 9900i SFA, 9900ix SFA, and Peterbilt 387, 357, 385, 320, 378, 379, and 362 applications. This fuel filter water separator cartridge is specified across model years from 1999 through 2025, depending on the truck platform. P550737 is a practical replacement choice for fleets and owners maintaining diesel fuel system protection on Kenworth, International, and Peterbilt equipment.

What It Is Used For

• Removing contaminants from diesel fuel before they reach the engine
• Separating water from fuel to reduce moisture-related fuel system issues
• Supporting consistent fuel delivery in heavy-duty truck service
• Replacing a worn or restricted fuel filter cartridge
• Maintaining filtration performance in commercial diesel applications

Installation Notes and Tips

Verify the filter style, dimensions, and application notes before installation. Confirm the cartridge matches the existing fuel water separator housing and follow the vehicle service procedure for priming and leak checks after replacement. Use the part number P550737 to confirm the correct service part for the application.

Quality Assurance

Donaldson specifies this filter using SAE J1488 and J1985 test standards, with published efficiency and burst-performance data for application matching. Cross-reference part numbers include Baldwin PF7755 and Gates 33657 for the same application.