Water Seperater
Donaldson Fuel Filter Water Separator – Part No. P551026
The Donaldson P551026 is a spin-on fuel filter and water separator featuring Twist & Drain™ technology, engineered to protect diesel engines by removing solid contaminants and separating water from fuel. Its robust design and high-efficiency media ensure reliable fuel cleanliness in demanding applications.
Key Features:
Dual-Stage Filtration
Combines cellulose and meltblown media to remove particles down to 10 microns with 99% efficiency, while separating 95% of emulsified water to safeguard injectors and pumps.
Twist & Drain™ Maintenance
Integrated twist-to-drain valve lets you discharge accumulated water without removing the cartridge, simplifying servicing and minimizing fuel spillage.
Heavy-Duty Construction
Sturdy canister and seal materials withstand vibration and pressure fluctuations for extended service life in heavy-duty environments.
Specifications:
Outer Diameter: 107.3 mm (4.22 in)
Length: 243.6 mm (9.59 in)
Thread Size: 1-14 UN
Gasket Outer Diameter: 99 mm (3.90 in)
Gasket Inner Diameter: 90.3 mm (3.56 in)
Filtration Efficiency: 99% @ 10 µm (ISO 19438 / SAE J1985)
Emulsified Water Separation: 95% (SAE J1985)
Media Type: Cellulose and meltblown
Style: Spin-on, Twist & Drain™
Typical Applications:
Heavy-Duty Trucks & Buses
Ensures clean, dry diesel fuel for on-highway and vocational vehicles.
Off-Road & Industrial Equipment
Fits construction machinery, agricultural tractors, and mining equipment requiring reliable water separation.
OEM Retrofit & Aftermarket Replacement
Cross-references many OEM part numbers (for example, Baldwin BF1363, Fleetguard FS19737, Mann+Hummel PL4207X, Mercedes-Benz 9604770003, Volvo 11110474).
Use Part No. P551026 to maintain fuel-system integrity, prevent water-related corrosion, and extend component life in demanding diesel applications
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