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Genuine Fleetguard FF5971NN Fuel Filter (Pack of 6) | OEM NanoNet® Technology for 2019+ Cummins 6.7L
Description
The world's most advanced fuel protection, in bulk. The Genuine Fleetguard FF5971NN (Pack of 6) uses patented NanoNet® media to capture 98.7% of particles as small as 4 microns. This is the factory-spec engine-mounted filter for 2019+ Ram Cummins owners who demand absolute injector safety. Choosing the 6-pack locks in 90,000 miles of premium protection against the microscopic silt that causes catastrophic fuel-system failure.
Technical Significance
The parts that make engines last. The FF5971NN is the pinnacle of diesel filtration. Where standard paper filters "un-load" trapped dirt under vibration and high-pressure surges, NanoNet®'s dense web of synthetic fibers holds onto it. As the secondary filter, it delivers the final polish your 2019+ high-pressure common rail system needs to keep injectors within factory tolerances for power and efficiency.
OEM vs. Aftermarket Comparison
| Feature | Genuine Fleetguard FF5971NN (This Product) | Generic Aftermarket Filters |
|---|---|---|
| Media Technology | NanoNet® synthetic fiber web | Standard pleated paper (cellulose) |
| Filtration Rating | 4-micron absolute efficiency | Often 10+ microns (allows damage) |
| Structural Integrity | Resists media migration & bypass | Prone to pleat bunching under load |
| Injector Safety | Maximum (Cummins approved) | Variable (risk of tip erosion) |
Package Contents
- (6) Genuine Fleetguard FF5971NN NanoNet® fuel filters
- (6) New high-spec sealing O-rings (pre-packaged with each filter)
- Factory bulk packaging for maximum cleanliness and authenticity
Vehicle Compatibility
The engine-mounted (under-hood) secondary fuel filter for:
- Ram 2500 / 3500 / 4500 / 5500: 2019, 2020, 2021, 2022, 2023, 2024+
- Cummins engine series: B6.7 Turbo Diesel (Gen 5)
Interchange / Cross-Reference: Mopar 68436631AA, 68436631AB, Cummins 5526400.
For 2019 and newer models only. Always pair with the frame-mounted separator (FS20172) for a complete system service.
Service Indicators
- Fuel rail pressure drop — power loss during heavy towing or grades
- Rough idling — the engine stumbles at stoplights
- Service counter: you've hit the 15,000-mile interval
- Bulk savings: you run a fleet and want a lower cost-per-service
Not sure it fits? Send us your VIN or Engine Serial Number (ESN) and we'll confirm 100% compatibility before you buy. Brand new, factory-sealed, and shipped fast.
Recently viewed
Customer Reviews
5.0 / 5
★★★★★
Based on 3 reviews
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★★★★★ NanoNet is worth every cent — cleared my fuel pressure code
Had an intermittent low fuel rail pressure code on my 2022 Ram 3500. Swapped both filters (paired with FS20172) and the code has not come back in 4,000 miles. The NanoNet media is noticeably denser than my old aftermarket filter. The 6-pack gives me 3 full services at my 15k interval. Locked in.
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★★★★★ Perfect for 2019+ Ram owners who tow heavy
I pull a 30k lb gooseneck regularly with my '21 3500 and I take fuel filtration seriously. These NanoNet filters are what Cummins specs for a reason. I can feel the difference in throttle response after a fresh filter swap. The 6-pack is great for guys like me who rack up miles fast.
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★★★★★ Bulk buy = savings, OEM quality = peace of mind
Ordered a 6-pack for our small construction company's Ram 5500s. Price per filter works out much better than buying singles at the dealer. O-rings included, factory sealed, no issues on any of the three trucks we've serviced so far. This is our go-to supplier now.
Frequently asked questions
How do I know this part fits my vehicle?
Every listing includes a full compatibility list by make, model, year, and engine. If you're unsure, send us your VIN or Engine Serial Number (ESN) via the chat or contact page and we'll confirm fitment before you order.
Are these genuine OEM parts or aftermarket alternatives?
Every product we sell is 100% genuine OEM — factory-sealed and sourced directly from the manufacturer or authorized distributors. We do not sell aftermarket substitutes or white-box alternatives.
Do I need a professional to install these parts?
Most fuel filters and basic maintenance components are straightforward DIY installs with basic hand tools. We recommend consulting your vehicle's service manual for torque specs and bleed procedures. For ignition components and TPMS sensors, a relearn procedure may be required — see the product description for details.