Fleetguard FF5971NN Fuel Filter – Pack of 6

Fleetguard FF5971NN Fuel Filter – 6-Pack
Nano Net® Media Fuel Filters for Cummins X15/ISX15 Engines

Keep your diesel engines protected and running efficiently with this 6-pack of Fleetguard FF5971NN Fuel Filters. Featuring cutting-edge Nano Net media, they capture fine contaminants and support today's high-pressure fuel systems — ideal for fleets and professionals seeking OEM performance and long service life.

Key Features:

• 6x Fleetguard FF5971NN fuel filters
• Genuine Cummins Filtration product
• Nano Net synthetic media removes 98.7% of particles ≥4 microns
• Extended service intervals and superior flow capacity
• Designed for secondary (high-pressure side) fuel filtration
• High-efficiency solution for modern diesel engines

Vehicle & Engine Compatibility:
Engineered for Cummins X15 / ISX15 / QSX15 engines, used in:

• Freightliner, Kenworth, Peterbilt, International, Volvo, and other Class 8 trucks
• Heavy-duty off-highway equipment running Cummins engines

Confirm compatibility using your engine serial number or maintenance manual.

Cross Reference:
Cummins 5575298 | Donaldson P550933 | Baldwin BF46002 | WIX 33674 | Luber-Finer LFF5971 | Napa 3674

What's Included: 6x Fleetguard FF5971NN Fuel Filters (individually boxed or bulk packed)

Installation Notes: Direct-fit replacement for the high-pressure side of the fuel system — prime the system after installation.

Shipping: Ships in 1–2 business days, tracked, fleet & wholesale orders welcome.

Nano Net Technology. Bulk Value. Built for Cummins Power.

❓ Quick FAQ

Which trucks/engines does this fit?
Cummins ISX15/X15 15-liter engines used in Class 8 semis (Freightliner, Kenworth, Peterbilt, International, Volvo) as well as industrial generators and heavy construction equipment.

What makes NanoNet® media better than standard filters?
Its multi-layer synthetic design traps over 98.7% of particles as small as 4 microns — critical for HPCR fuel systems running up to 30,000 PSI, where microscopic debris can damage injectors.

How do I replace this filter?

1. Drain the old filter canister into a catch pan; disconnect the WIF sensor if equipped.
2. Remove the old filter with a strap wrench.
3. Clean the mounting surface and transfer/replace the WIF sensor with a new O-ring if reused.
4. Pre-fill the new filter with diesel through the outer holes, lubricate the seal, then hand-tighten an additional 1/2–3/4 turn after contact.
5. Reconnect the WIF sensor wiring.
6. Cycle the ignition to RUN (without cranking) 3–5 times to prime the system, then start the engine and check for leaks.