Description
Fleetguard FS1212 spin-on fuel/water separator for the Cummins 855 Big Cam and N14 family — the shorter sibling of the FS1000 with the same 1″-14 UNS-2B mounting head, 7.92 in tall by 3.67 in OD. 20-micron media, 96% emulsified-water and 90% free-water separation. Direct replacement for Cummins 3308638 and 3315843; cross-references Baldwin BF1212, Donaldson P558000, and WIX 33405.
Signs You Need a New Fuel/Water Separator
- Water-in-fuel warning light on the dash
- Hard starting, rough idle, or misfires
- Power loss or hesitation under load
- Visible water or milky appearance when draining the bowl
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | FS1212 |
| Part Type | Spin-On Fuel/Water Separator |
| Engine Compatibility | Cummins 855 Big Cam, N14 (Celect / Celect Plus) |
| Length | 7.92 in (201 mm) |
| Largest OD | 3.67 in (93 mm) |
| Gasket OD | 2.83 in (72 mm) |
| Thread | 1″-14 UNS-2B |
| Micron Rating | 20 µm (SAE J1985) |
| Efficiency (TWA) | 96% |
| Water Separation | 90% free / 96% emulsified |
Cross References
This separator replaces or is equivalent to the following part numbers:
- Cummins: 3308638, 3315843
- Baldwin: BF1212
- Donaldson: P558000
- WIX: 33405
- NAPA: 3405
- Luber-finer: LFF8020
- FRAM: PCS5059, PS3712
- Purolator: F60024
- Volvo: 36849
- Ingersoll-Rand: 57138554
- Fleetguard: See longer version FS1000
Applications
This separator fits the following engines:
- Cummins 855 Big Cam (mechanical, 1976–1993)
- Cummins N14 Celect / Celect Plus (1993–2002)
Representative vehicles using these engines:
- Freightliner Classic / Classic XL / FLD120 / Century
- Kenworth W900 / T800 / T600
- Peterbilt 379 / 359 / 377 / 378
- International 9300 / 9400 Eagle
- Volvo / Autocar / Western Star with N14 spec
Verify your engine serial and fuel-system configuration before ordering. The longer FS1000 uses the same head — choose by housing space.
