Description
Fleetguard FS20165 is a spin-on fuel water separator engineered for Cummins QSB 6.7L and QSF 3.8L industrial and off-highway engines. Genuine Cummins Filtration with StrataPore media, this filter directly replaces Cummins OE 5523768 and provides 95% emulsified and 95% free water separation to protect high-pressure common-rail injectors from water and particulate damage.
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | FS20165 |
| Part Type | Fuel Water Separator (Spin-On) |
| Filter Media | StrataPore |
| Emulsified Water Separation | 95% |
| Free Water Separation | 95% |
| Overall Length | 9.29 in (236 mm) |
| Largest OD | 4.72 in (120 mm) |
| Thread Diameter | 4.69 in |
| Thread Form | Buttress, Class 1A |
| Gasket OD | 4.00 in |
| Gasket ID | 1.20 in |
| Engine Compatibility | Cummins QSB 6.7L, QSF 3.8L |
Cross References
This fuel water separator replaces or is equivalent to the following part numbers:
- Cummins: 5523768
- Also known as: 40C7018
Applications
This fuel water separator fits the following engines:
- Cummins QSB 6.7L (Tier 4, off-highway / industrial)
- Cummins QSF 3.8L (Tier 4, off-highway / industrial)
Representative equipment using these engines:
- Construction equipment (excavators, wheel loaders, telehandlers)
- Agricultural equipment (combines, sprayers, tractors)
- Industrial generator sets and power units
Verify your engine serial number and fuel filter housing before ordering to confirm fitment.









