Description
Protect Your Diesel Engine with iFJF FS1098 Fuel/Water Separator
Water contamination is one of the biggest threats to modern diesel fuel systems. Even small amounts of water can cause injector damage, corrosion, microbial growth, and catastrophic fuel system failure. The iFJF FS1098 Fuel/Water Separator with PCV Valve is designed to remove water and contaminants from diesel fuel before they reach your engine's sensitive high-pressure injection components.
This filter is a direct replacement for B6.7, ISB6.7/QSB6.7, ISL8.9, and L9 Series Diesel Engines, providing OEM-equivalent filtration performance. Each 2-pack delivers the protection you need for routine service intervals without paying dealership markups. Please fill the filter with fuel before installation.
Note: For off-road and commercial diesel applications. Verify compatibility with your specific engine configuration before ordering.
Key Features
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FS1098 Fuel/Water Separator PCV Valve: Specifically engineered for B6.7, ISB6.7/QSB6.7, ISL8.9, and L9 Series Diesel Engines. Direct OEM-spec replacement that installs without modifications.
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Complete Cross-Reference: Replaces OEM part numbers 5319680, FS1098, and 5308722. Also serves as a replacement element for FH21462 filter housings.
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Hydraulic Spin-On Design: These hydraulic spin-on filters are designed for best filtration efficiency, with a robust canister that withstands high fuel system pressures and vibration.
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Advanced Filtration Technology: Fuel filters deliver best-in-class quality using StrataPore and NanoNet technology, providing multi-layer filtration that captures water droplets, dirt, rust, and microbial contaminants down to the micron level.
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Integrated PCV Valve: Built-in pressure control valve maintains optimal fuel system pressure and prevents air locks after filter replacement.
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2-Pack Value: Each package includes two complete fuel/water separator filters, covering two service intervals and saving you money compared to buying individually.
Technical Specifications
| Specification |
Detail |
| Product Type |
Fuel/Water Separator Filter with PCV Valve |
| Filter Model |
FS1098 |
| OEM Part Numbers |
5319680, 5308722 |
| Cross-Reference |
FH21462 Element Replacement |
| Filter Type |
Hydraulic Spin-On |
| Technology |
StrataPore / NanoNet Multi-Layer Media |
| Package Quantity |
2 Filters (Pack of 2) |
| Brand |
iFJF |
Engine Compatibility
| Engine Series |
Engine Model |
Application Notes |
| B6.7 |
Cummins B6.7 |
Agricultural, Construction, Marine |
| ISB6.7 / QSB6.7 |
Cummins ISB / QSB 6.7L |
Dodge Ram 2500/3500 (2007+), Medium-Duty Trucks |
| ISL8.9 |
Cummins ISL 8.9L |
Motorcoach, RV, Fire Truck, Heavy-Duty Applications |
| L9 |
Cummins L9 |
Commercial Trucks, Bus, Industrial Power |
Compatible with vehicles and equipment using Cummins B6.7, ISB6.7, QSB6.7, ISL8.9, and L9 diesel engine platforms. Common applications include Dodge Ram 2500/3500 diesel trucks (2007+), Freightliner M2, International DuraStar, motorhomes, and agricultural/construction equipment. Always verify filter housing compatibility before ordering.
Installation Instructions
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Safety First: Park on level ground, engage parking brake, and allow engine to cool. Wear safety glasses and gloves.
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Relieve Pressure: Locate the fuel filter housing and follow your vehicle's procedure to relieve fuel system pressure.
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Remove Old Filter: Place a drain pan underneath. Using an appropriate filter wrench, spin the old filter counterclockwise to remove it.
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Clean Sealing Surface: Wipe the filter housing mounting surface clean with a lint-free cloth. Inspect for damage or old gasket material.
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Pre-Fill New Filter: Fill the new FS1098 filter with clean diesel fuel before installation to minimize engine cranking time and protect the injection pump.
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Lubricate Gasket: Apply a thin film of clean diesel fuel to the new filter gasket to ensure proper sealing.
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Install New Filter: Spin the new filter onto the housing by hand until the gasket contacts the mounting surface, then tighten an additional 3/4 to 1 turn per manufacturer specification.
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Prime the System: Follow your vehicle's fuel system priming procedure (manual primer pump or key-cycle method).
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Check for Leaks: Start the engine and inspect the filter seal area for any fuel leakage. Retighten if necessary.
Frequently Asked Questions
What happens if I don't replace my fuel/water separator regularly?
A clogged or water-saturated filter can restrict fuel flow, causing hard starts, power loss, and stalling. Water that bypasses a saturated filter can damage high-pressure injectors and the common rail system—repairs that can cost thousands of dollars. Regular replacement is the cheapest insurance for your diesel engine.
Will this fit my Dodge Ram 2500 with the 6.7L Cummins?
Yes, the FS1098 is compatible with 2007 and newer Dodge Ram 2500 and 3500 trucks equipped with the 6.7L Cummins ISB engine, provided your filter housing accepts the FS1098 cartridge. Always verify by cross-referencing your existing filter number.
Do I really need to pre-fill the filter with fuel?
Yes. Pre-filling the filter with clean diesel fuel significantly reduces cranking time needed to prime the system, protects the high-pressure fuel pump from running dry, and prevents air from entering the injection system. Never install a dry fuel filter on a diesel engine.
How often should I replace the fuel/water separator?
Most manufacturers recommend replacement every 15,000 to 30,000 miles or every other oil change, but this varies by vehicle usage. Heavy towing, dusty conditions, and poor-quality fuel can shorten filter life. Drain the water separator bowl at every oil change and replace the filter element when it shows signs of restriction.
What is the difference between a fuel filter and a fuel/water separator?
A standard fuel filter removes solid contaminants (dirt, rust, debris). A fuel/water separator goes further by using specialized media that causes water droplets to coalesce and settle out of the fuel stream. The FS1098 performs both functions with its multi-layer StrataPore/NanoNet media.
