Description
Fleetguard FS19521 spin-on fuel/water separator for Freightliner chassis-mounted pre-filter housings. It replaces Freightliner/Alliance ABPS3225P, Racor S3225P, and Wix 33630 with matching thread spec, height, and gasket geometry. Delivers 100% free-water separation and ~60% emulsified-water separation to protect downstream injection components.
Specifications
| Manufacturer | Fleetguard |
|---|---|
| Part Number | FS19521 |
| Part Type | Spin-On Fuel/Water Separator |
| Thread | 1-14 UNS-2B (Unified National) |
| Outside Diameter | 4.36 in |
| Gasket OD | 4.06 in |
| Height | 5.04 in |
| Free Water Separation | 100% |
| Emulsified Water Separation | ~60% |
Cross References
This part replaces or is equivalent to the following part numbers:
- Freightliner / Alliance: ABPS3225P, ABPN122S3225P
- Racor: S3225P
- Wix: 33630, 533630
- Baldwin: BF1348SP
- Donaldson: P550436
- Fram: PS7713
- NAPA: 3630
- GMC: 23514654
Applications
This filter fits the following housings:
- Freightliner chassis-mounted pre-filter housings spec’d for Alliance ABPS3225P / ABPN122S3225P
- Racor housings spec’d for S3225P (1-14 UNS thread, 4.06 in gasket)
Representative vehicles using these housings:
- Freightliner Cascadia, Columbia, Coronado, Business Class M2 (where ABPS3225P is the spec’d pre-filter)
- Western Star highway and vocational chassis with Racor S3225P-style pre-filter
Verify the existing filter or housing label before ordering; thread and gasket geometry must match.
