Description
Fleetguard FS20173 cartridge fuel/water separator, the OE service filter on 2017+ Paccar MX and Cummins X15 platforms (Paccar K37-1012). The element delivers 99.4% emulsified water separation efficiency through Fleetguard’s pleated yellow-media construction, with a 4.16″ largest OD and 7.62″ overall length. Designed for the 2017+ Davco-style fuel-pro housings used on Kenworth, Peterbilt, and Cummins X15 platforms.
Specifications
| Manufacturer | Fleetguard |
|---|---|
| Part Number | FS20173 |
| Part Type | Fuel/water separator, cartridge |
| Engine Compatibility | Paccar MX-11, MX-13 (2017+); Cummins X15, X12 (2017+) |
| Emulsified Water Separation | 99.4% |
| Largest OD | 105.7 mm (4.16 in) |
| Length | 193.6 mm (7.62 in) |
| Largest End ID | 20.7 mm (0.81 in) |
| BPV Opening DP | No |
Cross References
This part replaces or is equivalent to the following part numbers:
- Paccar: K37-1012, K371012
- Donaldson: P581298
- Baldwin: PF46082
- Hastings: PF46082
- Wix: WF10499
Applications
This fuel/water separator fits 2017+ MX and X15 on-highway diesel platforms:
- Paccar MX-13 12.9L, MX-11 10.8L (2017+)
- Cummins X15 / X12 (2017+)
Representative trucks using these engines:
- Kenworth T680, T880, W990 (2017+)
- Peterbilt 579, 567 (2017+)
Verify your engine model year and existing fuel-pro housing before ordering. The 2017+ FS20173 is not interchangeable with the earlier FS19918 / FS19838 generations.









