Description
Fleetguard FS1251 spin-on fuel/water separator for Cummins B-series 3.9L / 5.9L (4B / 6B) and C 8.3L (6C) engines. Direct replacement for Cummins 3286503 and 3843760, an upgrade of the earlier FF5052 / FS1226 with 90% emulsified- and free-water separation, 96% TWA efficiency, and a 20 micron rating per SAE J1985.
Specifications
| Manufacturer | Fleetguard |
|---|---|
| Part Number | FS1251 |
| Part Type | Spin-On Fuel/Water Separator |
| Engine Compatibility | Cummins B 3.9L / 5.9L (4B / 6B), C 8.3L (6C) |
| Overall Height | 5.63 in (142.9 mm) |
| Largest Outer Diameter | 3.02 in (76.71 mm) |
| Emulsified Water Separation | 90% |
| Free Water Separation | 90% |
| Efficiency (TWA, SAE J1985) | 96% |
| Micron Rating (SAE J1985) | 20 micron |
Cross References
This separator replaces or is equivalent to:
- Cummins: 3286503
- Cummins: 3843760
- Donaldson: P550248
- Baldwin: BF1226
- Fleetguard: FF5052 / FS1226 (predecessors)
Applications
This fuel/water separator fits the following engines:
- Cummins B 3.9L (4B)
- Cummins B 5.9L (6B / ISB pre-common-rail era)
- Cummins C 8.3L (6C / ISC pre-common-rail era)
Used with the 3311505S remote-mount filter head where specified. Verify Cummins engine serial and fuel-system architecture before ordering — later common-rail B 6.7L / ISC8.3 EPA10+ engines use a different separator.
