Description
Cartridge fuel/water separator for 2000-2007 Dodge Ram 2500/3500 with the 5.9L Cummins ISB inline-six (covers both 24V VP44 and common-rail eras). ULSD-compatible upgrade to FS19579. Replaces Cummins 4941251 (also 3942470) and Mopar 5015581AD; crosses to Baldwin PF7777, Donaldson P550785, and Wix 33585XE.
Specifications
| Manufacturer | Fleetguard |
|---|---|
| Part Number | FS19855 |
| Part Type | Fuel/Water Separator Cartridge |
| Engine Compatibility | Cummins ISB 5.9L (2000-2007 Dodge Ram) |
| Micron Rating | 10 micron (SAE J1985) |
| Efficiency | 98.7% TWA (SAE J1985) |
| Water Separation | 95% free and emulsified |
| Largest OD | 3.41 in (86.61 mm) |
| Overall Height | 4.10 in (104.14 mm) |
| ULSD Compatible | Yes |
Cross References
This part replaces or is equivalent to the following part numbers:
- Cummins: 4941251, 3942470
- Mopar/Chrysler: 5015581AD
- Baldwin: PF7777
- Donaldson: P550785
- Wix: 33585XE
- Fleetguard (predecessor): FS19579 (non-ULSD)
Applications
This fuel/water separator cartridge fits the following engines:
- Cummins ISB 5.9L 24V VP44 (2000-2002)
- Cummins ISB 5.9L 24V common rail (2003-2007)
Representative vehicles using these engines:
- Dodge Ram 2500 / 3500 (2000-2007)
Verify your engine serial number and configuration before ordering to confirm fitment.









