Donaldson P550106 Fuel Filter

Fuel Water Separator Filter

The Donaldson P550106 is a spin-on fuel filter and water separator built for heavy-duty diesel fuel systems. It is specified for applications such as Freightliner Classic XL, Kenworth T600A, and Peterbilt 378, with fitment focused on fuel filtration and water separation.

Key Features

• Spin-on style for straightforward filter replacement.
• Water separator design helps remove emulsified water from fuel.
• ISO 19438 efficiency testing standard for filtration performance reference.
• 100 collapse burst rating for structural strength under pressure.
• 1-14 UN thread size with a 3.66 in outer diameter.
• Primary application listed as Cummins 202893.

Detailed Description

Donaldson P550106 is a fuel filter water separator designed for diesel applications that require both particulate filtration and water removal. The filter uses a spin-on construction with a 1-14 UN thread and measures 188 mm in length, making it a direct service part for compatible heavy-duty fuel systems. Its published efficiency data includes 99% efficiency at 25 microns and 95% emulsified water efficiency, which supports cleaner fuel delivery in demanding operating conditions. This part cross-references Monroe Shocks & Struts (e.g., 33108) for the same application.

For buyers searching for a Donaldson fuel filter for Freightliner Classic XL, Kenworth T600A, or Peterbilt 378, the P550106 is a fitment-specific replacement built around the listed application data. The Donaldson P550106 also appears under Cummins 202893 as its primary application reference, and the part number P550106 is commonly used when matching service filters by specification.

What It Is Used For

• Replacing a clogged fuel filter in diesel fuel systems.
• Separating water from fuel before it reaches the engine.
• Restoring fuel flow when restriction increases.
• Addressing contamination that can affect injector performance.
• Supporting routine service on heavy-duty filtration systems.

Installation Notes and Tips

Verify the thread size, gasket dimensions, and overall length before installation. Match the application reference and fitment notes to the existing filter specification, especially when servicing Freightliner Classic XL, Kenworth T600A, or Peterbilt 378 applications. The spin-on design allows replacement by threading the filter onto the mounting head and checking for proper seal engagement.

Quality Assurance

Donaldson publishes performance data for this filter, including ISO 19438 testing, 99% efficiency at 25 microns, 95% emulsified water efficiency, and a 100 collapse burst rating. The P550106 part number is used across multiple cross-reference listings for the same application.