Description
Fleetguard FF5206 is a 20-micron spin-on secondary fuel filter for Detroit Diesel Series 60 (12.7L / 14L) and Series 50 engines, replacing Detroit Diesel 23530707 in the two-stage filtration system that pairs the FF5206 secondary with the FF5207 primary. The 13/16-12 thread, 6.91 in length, and 3.69 in OD match the OE filter housing exactly. Upgrade path: Fleetguard FF5333 with finer media for the same housing.
Signs You Need a New Fuel Filter
- Loss of power, especially under load or at high RPM
- Hard starting or extended cranking
- Engine surging or rough idle
- Reduced fuel economy
- Service interval reached (typically 25,000–50,000 mi on Series 60)
Specifications
| Manufacturer | Fleetguard (Cummins Filtration) |
|---|---|
| Part Number | FF5206 |
| Part Type | Spin-On Secondary Fuel Filter |
| Micron Rating (SAE J1858) | 20 µm |
| Efficiency (SAE J1858) | 99% |
| Length | 6.91 in (175.6 mm) |
| Largest OD | 3.69 in (93.6 mm) |
| Gasket OD | 3.49 in |
| Gasket ID | 3.11 in |
| Thread Size | 13/16-12 UNS-2B |
| Engine Compatibility | Detroit Diesel Series 60 (12.7L / 14L); Series 50 |
| Upgrade | Fleetguard FF5333 |
Cross References
This filter replaces or is equivalent to the following part numbers:
- Detroit Diesel: 23530707, 23518685, 23518482, 23518530, 25010778, 25010794
- Baldwin: BF5810
- Donaldson: P556916
- Wix: 33359
- Fram: P1147
- Hastings: FF993
- Luber-Finer: LFF3360
- Napa: 3359
- Carquest: 86120
- Hengst: H180WK
- Motorcraft: FD767, FG767
- Caterpillar: 9Y-4418, 8T-3911
- Kenworth / Peterbilt: KW206, PB206
Applications
This fuel filter fits the following engines:
- Detroit Diesel Series 60 12.7L (1987–2003)
- Detroit Diesel Series 60 14L (1998–2007)
- Detroit Diesel Series 50 8.5L (1992–2003)
Representative vehicles using these engines:
- Freightliner FLD120, Classic, Century Class, Columbia (Series 60)
- Kenworth T600, T800, W900 (Series 60)
- Peterbilt 379, 378, 387 (Series 60)
- Western Star 4900, 5900 (Series 60)
- International 9200, 9400, 9900 (Series 60)
- Transit and shuttle buses with Series 50
Verify your engine and fuel-system layout — FF5206 is the secondary; the primary on most Series 60 installations is Fleetguard FF5207.
