Description
Product Overview
The FF63009 / FS1098 Fuel Water Separator with PCV Valve is a critical fuel system component for Cummins B6.7, ISB6.7, QSB6.7, ISL8.9, ISL9, QSL9, and L9 diesel engines. This complete assembly includes the filter element and integrated PCV (Pressure Control Valve) to maintain proper fuel rail pressure. Replaces Fleetguard FS1098, Cummins 5303743, and Cummins 5319680.
Key Features
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Complete Assembly — Includes both the fuel/water separator filter element and the integrated PCV (Pressure Control Valve) for a complete fuel system service in one part.
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Wide Engine Coverage — Compatible with Cummins B6.7 (ISB6.7 / QSB6.7) and L9 (ISL8.9 / ISL9 / QSL9) diesel engine platforms used in Ram trucks, Freightliner, school buses, and construction equipment.
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Advanced Water Separation — Multi-layer filtration media effectively removes water and solid contaminants that can destroy high-pressure common rail injectors and CP3/CP4 fuel pumps.
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OEM-Spec Quality — Manufactured to meet or exceed Cummins/Fleetguard specifications for filtration efficiency, flow rate, and burst pressure.
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PCV Valve Included — The integrated pressure control valve maintains proper fuel rail pressure and prevents over-pressure damage to injectors and fuel lines.
Engine Compatibility
| Engine |
Displacement |
Common Applications |
| Cummins B6.7 / ISB6.7 |
6.7L Inline-6 |
Ram 2500/3500 (2013+), Freightliner M2, Thomas/Freightliner School Buses |
| Cummins QSB6.7 |
6.7L Inline-6 |
Construction Equipment, Marine, Industrial |
| Cummins ISL8.9 / ISL9 |
8.9L Inline-6 |
Transit Buses, Refuse Trucks, Motorhomes, Fire Trucks |
| Cummins QSL9 / L9 |
8.9L Inline-6 |
Heavy Equipment, Marine, Generator Sets |
Cross-Reference Part Numbers
| Brand |
Part Number |
| Fleetguard / Cummins |
FS1098, FF63009 |
| Cummins OEM |
5303743, 5319680 |
Technical Specifications
| Specification |
Value |
| Filter Type |
Fuel/Water Separator Assembly with PCV Valve |
| Filtration Rating |
7-10 Micron |
| Media Type |
Synthetic/Cellulose Blend with Hydrophobic Treatment |
| PCV Valve |
Integrated Pressure Control Valve |
| Service Interval |
15,000-30,000 miles (varies by application) |
Installation Notes
- Relieve fuel system pressure before removal
- Remove the old filter assembly from the fuel filter housing
- Clean the housing interior and sealing surfaces
- Install the new FS1098 assembly with the PCV valve oriented correctly
- Tighten the housing lid to the manufacturer's torque specification
- Prime the fuel system by cycling the key 3-5 times before starting
- Check for leaks after starting the engine
FAQ
Q: Does this fit my 2018 Ram 2500 with the 6.7L Cummins?
A: The FS1098 is primarily used on chassis-mounted fuel filter housings found on commercial vehicles and equipment. Ram 2500/3500 trucks with the 6.7L Cummins typically use two under-hood cartridge filters (front and rear). Verify your truck's specific filter configuration.
Q: What is the PCV valve and why is it included?
A: The PCV (Pressure Control Valve) regulates fuel rail pressure in the common rail system. A failing PCV can cause hard starting, rough idle, power loss, and fuel pressure codes. This assembly replaces both the filter and PCV for a complete service.
Q: How often should I change this filter?
A: Recommended service interval is 15,000-30,000 miles depending on application and fuel quality. Commercial vehicles operating in severe conditions should follow the shorter interval.
Q: What are the symptoms of a clogged FS1098 filter?
A: Symptoms include low fuel rail pressure codes (P0087), power loss under acceleration, hard starting, rough idle, reduced fuel economy, and in severe cases, engine derate or limp mode.
