Description
Fleetguard FS19596 is the StrataPore upgrade of the original FS1003, a spin-on fuel/water separator with integrated WIF sensor port for Cummins B-series, ISB, QSB, and 4BT 3.9 applications. The 7-micron StrataPore media delivers 98.7% efficiency per SAE J1985 (versus 10-micron on the FS1003), with 95% emulsified water separation. It replaces Cummins 3954891 with the same 1-14 UNS-2B thread, 9.78 in length, and 3.69 in OD as the OE filter.
Signs You Need a New Fuel Filter
- Loss of power under load or extended cranking on cold start
- Water-in-fuel light illuminated
- Engine hesitation, surging, or rough idle
- Reduced fuel economy
- Service interval reached (typically 250–500 hours / one season)
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | FS19596 |
| Part Type | Spin-On Fuel/Water Separator |
| Media | StrataPore Synthetic |
| Micron Rating (SAE J1985) | 7 µm |
| Efficiency (SAE J1985) | 98.7% |
| Emulsified Water Separation | 95% |
| Length | 9.78 in (248.3 mm) |
| Largest OD | 3.69 in (93.8 mm) |
| Gasket OD | 2.83 in |
| Gasket ID | 2.46 in |
| Thread Size | 1-14 UNS-2B |
| Engine Compatibility | Cummins B / ISB / QSB / 4BT 3.9 |
| Predecessor | Fleetguard FS1003 (10-micron, same housing fit) |
Cross References
This filter replaces or is equivalent to the following part numbers:
- Cummins: 3954891, 3954904
- Baldwin: BF1293-SPS
- Donaldson: P551103
- Wix: 33604XE
- Napa Gold: 3604XE
- Luber-Finer: LFF1003
- Atlas Copco: 5580010914
- Ingersoll-Rand: 22637904
- Fleetguard family: FS1003 (10-micron predecessor)
Applications
This fuel/water separator fits the following engines:
- Cummins 4BT 3.9L (industrial / agricultural)
- Cummins 6BT 5.9L 12V / 24V (1989–2002)
- Cummins ISB 5.9L (mechanical and electronic, 1998–2007)
- Cummins QSB 5.9L / 6.7L (industrial / marine)
Representative vehicles and equipment using these engines:
- Industrial gensets and air compressors with B / 4BT power (Atlas Copco, Ingersoll-Rand)
- Case / New Holland tractors and skid steers with B-series Cummins
- Cummins-powered marine pleasure craft and patrol boats with QSB
- Stationary irrigation and pump-set engines
The FS19596 fits the same housing as FS1003 with finer filtration. Verify the WIF sensor configuration on your filter head before ordering.
