Description
FF5776 Primary Fuel Filter for Cummins ISX 11.9L & 15L Diesel Engines
The FF5776 primary fuel filter is designed for 2010+ Cummins ISX 11.9L, 15L, and 16L diesel engines in Class 8 heavy-duty trucks. This is the primary/water separator filter — the first line of defense. Replaces 2864993, 2893612, 3685306 and Fleetguard P555776.
Key Features
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Primary Filtration Stage: First-stage filter for 2010+ ISX 11.9L, ISX15, and ISX16 engines — captures large particles and separates water before the secondary filter.
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High Dirt-Holding Capacity: Engineered media holds more contaminants between changes, extending service life in dusty conditions.
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Water Separation: Advanced coalescing media removes free and emulsified water — critical for the ISX's high-pressure common rail system.
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OEM Cross Reference: Replaces Cummins 2864993, 2893612, 3685306 — exact dimensional match.
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IATF 16949 Certified: Same quality management standard as major OEM filter manufacturers.
Technical Specifications
| Specification |
Value |
| Part Number |
FF5776 / P555776 |
| OEM Numbers |
2864993, 2893612, 3685306 |
| Filtration Stage |
Primary / Water Separator |
| Engine |
Cummins ISX 11.9L, ISX15, ISX16 (2010+) |
| Application |
Kenworth, Peterbilt, International, Freightliner Class 8 |
Vehicle & Engine Compatibility
| Engine |
Truck Models |
Displacement |
| 2010+ ISX15 |
Kenworth T680/T880, Peterbilt 579/389, Freightliner Cascadia, International LT |
15.0L |
| 2010+ ISX11.9 |
International ProStar, Kenworth T680 |
11.9L |
| ISX16 |
Heavy-haul and mining truck applications |
16.0L |
Why Choose This Product?
The 2010+ ISX common rail fuel system operates at extreme pressures. A failed primary filter lets water and debris reach the secondary filter and potentially the injectors. The FF5776's dual-stage media provides the first critical barrier.
Frequently Asked Questions
Q: Is this the primary or secondary filter?
A: The FF5776 is the PRIMARY filter — typically the larger of the two spin-ons, first in the fuel flow path. Replace together with the secondary filter.
Q: How often should this filter be changed?
A: Every 15,000-25,000 miles. Many fleets replace primary and secondary filters as a set. Drain the water separator bowl weekly.
Q: Will this fit my 2008 ISX engine?
A: No. The 2010+ ISX engines use a different filter head design. The FF5776 fits 2010 and newer engines only.
Q: Does this filter require a special tool?
A: A standard oil filter wrench or strap wrench works. Hand-tighten only during installation — 3/4 to 1 turn after gasket contact.
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