Description
Fleetguard FF5825NN spin-on secondary fuel filter for Cummins ISX, ISX11.9, ISX15, and X15 engines — the NanoNet upgrade to FF5776, replacing Cummins 5365988, 5599456, 2864993, 2893612, and 3685306. Multi-layer synthetic NanoNet media holds far more particulate at consistent differential pressure than the prior cellulose FF5776, protecting high-pressure common-rail injectors over longer service intervals. Same M90 x 2.0 mount, same envelope.
Signs You Need a New Fuel Filter
- Loss of power under load or extended cranking on start-up
- Fuel-restriction or low-suction-pressure fault codes
- Engine surging, hesitation, or rough idle
- Visible smoke from the exhaust under load
Specifications
| Manufacturer | Fleetguard |
|---|---|
| Part Number | FF5825NN |
| Part Type | Secondary fuel filter, spin-on |
| Engine Compatibility | Cummins ISX, ISX11.9, ISX15, X15 |
| Media | NanoNet (multi-layer synthetic) |
| Thread | M90 x 2.0 |
| Overall Height | 226.49 mm (8.917 in) |
| Outer Diameter | 120.3 mm (4.736 in) |
| Service Interval | Extended (per Cummins schedule) |
Cross References
This part replaces or is equivalent to the following part numbers:
- Cummins: 5365988, 5599456, 2864993, 2893612, 3685306
- Fleetguard (predecessor): FF5776, FF5686
- Baldwin: BF46129, BF9885
- Donaldson: DBF6776
- WIX: WF10515
- Luber-finer (Champion): LFF6776XL
Applications
This filter fits the following Cummins engines:
- Cummins ISX / ISX15 (15.0L, 2010–2016)
- Cummins ISX11.9 (11.9L, 2010–2016)
- Cummins X15 (15.0L, 2017–2019)
Representative vehicles using these engines:
- Freightliner Cascadia, Columbia, Coronado (Cummins ISX/X15, 2010–2019)
- Kenworth T660, T680, T880, W900 (Cummins ISX/X15, 2010–2019)
- Peterbilt 386, 387, 389, 567, 579 (Cummins ISX/X15, 2010–2019)
- International ProStar, LoneStar (Cummins ISX option, 2010–2019)
- Western Star 4900, 5700 (Cummins ISX option)
For 2020+ X15/X12 with the longest service interval, see FF5971NN (extended-life replacement on the same mount).
Verify your engine serial number and configuration before ordering to confirm fitment.
