Description
Product Overview
The FS1098 Fuel Water Separator Fuel Filter is a direct replacement for the Cummins B6.7, ISB6.7, QSB6.7, ISL8.9, and L9 diesel engine fuel/water separator. This high-efficiency filter removes water and contaminants from diesel fuel before they reach the high-pressure injection system. Replaces Fleetguard FS1098 and Cummins part number 5319680, 5303743. Compatible with Freightliner W100CFI, W120CFI, and W130CFI models.
Key Features
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Cummins Fleetguard Compatible — Direct replacement for FS1098 / Cummins 5319680 and 5303743. Exact fit for B6.7/ISB6.7 and L9/ISL8.9 engine fuel systems.
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Superior Fuel Protection — Advanced filtration media removes water and solid particles down to 7 microns, protecting CP3/CP4 high-pressure fuel pumps and common rail injectors from premature wear and failure.
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Heavy-Duty Construction — Built to withstand the demands of commercial trucking, construction equipment, school buses, and industrial diesel applications. Meets OEM burst pressure and flow rate specifications.
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PCV Valve Compatible — Designed to work with the integrated fuel system PCV (Pressure Control Valve) found on B6.7 and L9 engine platforms.
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Freightliner Ready — Compatible with Freightliner W100CFI, W120CFI, and W130CFI models equipped with Cummins B6.7 and L9 diesel engines.
Engine Compatibility
| Engine |
Displacement |
Common Applications |
| Cummins B6.7 / ISB6.7 |
6.7L Inline-6 |
Ram 2500/3500, Freightliner M2 106, Thomas/Freightliner School Buses, Blue Bird Buses |
| Cummins QSB6.7 |
6.7L Inline-6 |
Construction Equipment, Marine Engines, Generator Sets, Agricultural Machinery |
| Cummins ISL8.9 / L9 |
8.9L Inline-6 |
Transit Buses, Refuse Trucks, Motorhomes, Fire Trucks, Concrete Mixers |
| Cummins QSL9 |
8.9L Inline-6 |
Heavy Construction Equipment, Marine Propulsion, Industrial Power |
Cross-Reference Part Numbers
| Brand |
Part Number |
| Fleetguard / Cummins Filtration |
FS1098 |
| Cummins OEM |
5319680, 5303743 |
| Freightliner |
W100CFI, W120CFI, W130CFI Compatible |
Technical Specifications
| Specification |
Value |
| Filter Type |
Fuel/Water Separator |
| Filtration Rating |
7 Micron (Nominal) |
| Media Type |
Synthetic/Cellulose Composite with Hydrophobic Treatment |
| Flow Rate |
Up to 90 GPH (340 LPH) |
| Water Separation Efficiency |
>95% at rated flow |
| Service Interval |
15,000 miles / 500 hours / 12 months |
Warning Signs Your Fuel Filter Needs Replacement
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Check Engine Light / Derate — Low fuel pressure codes (P0087, P0088) often indicate a restricted fuel filter
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Power Loss Under Load — Engine feels sluggish when climbing hills or towing
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Hard Starting / Extended Cranking — Restricted fuel flow makes cold starts difficult
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Water in Fuel Warning — Drain the separator immediately and replace the filter if the warning persists
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Reduced Fuel Economy — Engine compensates for restricted flow with increased injection duration
FAQ
Q: Will this fit my Freightliner M2 with a Cummins B6.7?
A: Yes. The FS1098 is compatible with Freightliner M2 106 trucks equipped with Cummins B6.7 engines. It fits the chassis-mounted fuel/water separator housing.
Q: What's the difference between this and the FS1098 with PCV valve?
A: This is the filter element only. Some FS1098 assemblies include an integrated PCV (Pressure Control Valve). If your vehicle requires the complete assembly with PCV, verify before ordering.
Q: How do I know if I need just the filter or the complete assembly?
A: If you're experiencing fuel pressure codes (P0087, P0088) or rough running, the PCV valve may also need replacement. The filter-only version is suitable for routine maintenance. The complete assembly with PCV is recommended when troubleshooting fuel system issues.
Q: Can I use this on a Ram 3500 with the 6.7L Cummins?
A: Ram trucks use a different filter configuration (two under-hood cartridge filters). The FS1098 is designed for chassis-mounted separator housings on commercial vehicles. Check your vehicle's specific filter specification.
Q: How often should I drain the water separator?
A: Drain the water separator monthly as preventive maintenance, or immediately when the "Water in Fuel" warning light illuminates. Even with a good filter, water can accumulate in the housing bowl and should be drained regularly.
