Description
Product Overview
Keep your 6.7L Cummins turbo diesel running at peak performance with the iFJF FF266 Fuel Filter. Engineered as a direct replacement for Cummins part number 5335504 and Fleetguard 800154401, this high-efficiency fuel filter delivers 4-micron absolute filtration — protecting your high-pressure common rail (HPCR) injection system from water, debris, and contaminants that can destroy injectors.
The 6.7L Cummins fuel system operates at pressures exceeding 30,000 PSI. Any contamination can cause catastrophic injector failure. This FF266 filter meets or exceeds OEM specifications for filtration efficiency, water separation, and dirt-holding capacity — at a fraction of dealer pricing.
Key Features
-
4-Micron Absolute Filtration — Removes 99.9% of particles ≥4 microns, protecting HPCR injectors
-
Advanced Water Separation — Coalescing media strips emulsified water from ULSD/biodiesel blends
-
OEM-Grade Media — Synthetic multi-layer filter media with anti-drainback valve
-
Direct Fit — No modifications required; drops into factory filter housing
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10,000-15,000 Mile Service Interval — Matches OEM recommended change schedule
Compatibility / Fitment
| Year |
Make |
Model |
Engine |
| 2007–2024 |
Dodge / Ram |
2500 |
6.7L Cummins Turbo Diesel |
| 2007–2024 |
Dodge / Ram |
3500 |
6.7L Cummins Turbo Diesel |
| 2007–2024 |
Dodge / Ram |
4500 |
6.7L Cummins Turbo Diesel |
| 2007–2024 |
Dodge / Ram |
5500 |
6.7L Cummins Turbo Diesel |
Cross-Reference / Replaces
| Brand |
Part Number |
| Cummins / Fleetguard |
5335504, FF266, 800154401 |
| Mopar |
68157291AA |
| WIX |
WF10105 |
| Baldwin |
PF46108 |
| Donaldson |
P553205 |
Specifications
| Specification |
Value |
| Filter Type |
Spin-on Fuel/Water Separator |
| Filtration Rating |
4 Micron Absolute |
| Thread Size |
M95 x 2.5 |
| Outer Diameter |
Approx. 4.3 inches |
| Height |
Approx. 6.9 inches |
| Gasket |
Nitrile (Buna-N) |
| Anti-Drainback Valve |
Yes |
Why Choose iFJF?
We source directly from ISO/TS 16949 certified manufacturers — the same supply chain that feeds major OEM and aftermarket brands. Every filter undergoes multi-point quality inspection including media integrity testing, thread gauge verification, and burst pressure testing. You get OEM reliability without the dealership markup.
Installation Tips
- Relieve fuel system pressure before removal
- Clean filter housing mounting surface thoroughly
- Fill new filter with clean diesel fuel before installation (reduces cranking time)
- Lubricate gasket with clean diesel fuel — never use grease
- Hand-tighten, then 3/4 turn with filter wrench
- Prime fuel system by cycling key ON (not START) 3-4 times for 30 seconds each
Frequently Asked Questions
Q: How often should I change this fuel filter?
A: Cummins recommends every 15,000 miles or 12 months under normal conditions. If you tow heavy, idle frequently, or use biodiesel blends, change every 10,000 miles.
Q: Will this fit my 2018 Ram 2500 with the 6.7L Cummins?
A: Yes. This filter fits all 2007-2024 Ram 2500/3500/4500/5500 models with the 6.7L Cummins turbo diesel engine.
Q: Does this filter come with the water-in-fuel (WIF) sensor?
A: No. This is the filter element only. The WIF sensor is part of the filter housing and can be reused — simply unscrew it from the old filter and thread it into the new one.
Q: What's the difference between FF266 and other fuel filters?
A: The FF266 is a 4-micron absolute fuel/water separator specifically designed for the high-pressure common rail injection system on 6.7L Cummins engines. Standard filters may only achieve 10-20 micron filtration — insufficient for HPCR protection.
Q: Can I use this on a deleted truck?
A: Yes, this is a maintenance fuel filter — it has nothing to do with emissions equipment. Suitable for all 6.7L Cummins applications including off-road/competition use.
Q: Does this filter work with biodiesel (B5/B20)?
A: Yes. Our synthetic media is compatible with ULSD and biodiesel blends up to B20. For higher bio blends, consider more frequent change intervals.
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