Donaldson P551011 Fuel / Water Separator | Detroit DD13, DD15 & DD16 Primary Fuel Filter

Donaldson P551011 Fuel / Water Separator for Detroit DD13, DD15 & DD16 Engines

The Donaldson P551011 Fuel / Water Separator is a premium cartridge-style primary fuel filter engineered to remove water, dirt, rust, and harmful contaminants before they reach your engine's high-pressure fuel system. Designed specifically for Detroit Diesel DD13, DD15, and DD16 engines, the P551011 helps protect expensive fuel injectors and fuel pumps while maintaining maximum fuel system performance.

Today's common rail diesel fuel systems operate at extremely high pressures where even microscopic contaminants can cause premature injector wear, fuel pump damage, and costly repairs. Donaldson's advanced Synteq™ filtration media delivers exceptional filtration efficiency and water separation to keep clean, dry fuel flowing to your engine under the toughest operating conditions.

Trusted by fleets, owner-operators, and diesel repair facilities across North America, the Donaldson P551011 is an OEM-quality replacement fuel/water separator designed for maximum reliability and long service life.

Key Features

• Premium primary fuel and water separator
• Designed for Detroit DD13, DD15 & DD16 engines
• Advanced Donaldson Synteq™ filtration media
• Removes water and harmful contaminants
• Protects injectors and high-pressure fuel pumps
• 99% filtration efficiency at 7 microns
• Excellent water separation performance
• OEM-quality fit and sealing
• Heavy-duty construction for commercial trucking applications

Specifications

• Part Number: P551011
• Brand: Donaldson
• Filter Type: Fuel / Water Separator
• Style: Cartridge
• Filtration Efficiency: 99% @ 7 Microns
• Water Separation Efficiency: Up to 95%
• Media: Synteq™ Synthetic Filtration Media
• Application: Detroit DD13, DD15 & DD16 Engines

Benefits of Replacing Your Fuel / Water Separator

• Protects expensive fuel injectors
• Removes damaging water from diesel fuel
• Protects high-pressure fuel pumps
• Maintains proper fuel pressure
• Improves engine performance
• Reduces injector wear
• Helps maximize fuel economy
• Extends fuel system life

Common Applications

• Detroit DD13 Engines
• Detroit DD15 Engines
• Detroit DD16 Engines
• Freightliner Cascadia
• Freightliner Coronado
• Western Star 4700
• Western Star 4900
• Western Star 5700XE
• Commercial Fleets
• Owner-Operator Trucks

Major Cross Reference Numbers

• Fleetguard FS19915
• Baldwin PF9804
• Donaldson P550854 (Replacement Version)
• Luber-Finer L9915F
• WIX 33655
• NAPA 3655
• Detroit Diesel A0000903651
• Detroit Diesel A4720921205
• Mercedes-Benz A0000903651
• Mercedes-Benz A4720921205
• Alliance ABPN10GFS19915

Why Fuel / Water Separation Is Critical

Water contamination is one of the leading causes of injector failure and fuel system damage in modern diesel engines. High-pressure common rail fuel systems operate with extremely tight tolerances, making effective water separation essential for long engine life.

Replacing your fuel/water separator at the recommended maintenance interval helps prevent corrosion, injector damage, fuel pump wear, and costly downtime while maintaining reliable engine performance.