
FS1251 Fuel Water Separator NAKATU
The NAKATU FS1251 is an aftermarket spin-on fuel/water separator designed for compatible diesel engines. Its filtration media helps capture particulate contaminants and separate water from diesel fuel, supporting cleaner fuel delivery and protection of engine fuel injection components.
Specifications
- Model:
- FS1251 Fuel Water Separator NAKATU
- Product Type:
- Fuel water separator
- Replaces:
- Fleetguard FS1251; Baldwin BF1226 / BF46149-SP; Donaldson P550248; FRAM P8043; Luber-Finer LFF8062; MANN WK716/2X; WIX WF10024; NAPA 3472
- Applicable engine number:
- Cummins 4B / 6B / 4B3.9 / 6B5.9 / 6C8.3; Freightliner FL50 / FL60 / FL70 / FL80 / MB Line; compatible AGCO and Komatsu equipment.
- Key Specifications:
- Height: 142.90 mm Largest Outside Diameter: 76.71 mm Gasket ID: 62.48 mm Gasket OD: 69.09 mm Thread Size: M16 x 1.5-6H INT Filter Rating: 20 Micron Efficiency: 96% Water Separation: 90%
- OEM Part Numbers:
- Cummins 3286503 / 3843760 / 3903202; AGCO 72515734; Volvo 3134055 / 85105025; Komatsu 1240619H1 / 1240619H2
- Designed for diesel fuel filtration and water separation.
- Helps capture particulate contaminants from diesel fuel.
- 20-micron filtration rating according to SAE J1985 specifications.
- 90% emulsified water separation performance.
- 90% free water separation performance.
- Spin-on construction for convenient replacement.



