Description
FS36401 Fuel Filter 10 micron for 1995-2005 T-Series T440 T601 ISX 400 ISX 600 2011 T-Series T403 T610 T610SAR T659 ISX 600 Replace K371004
Premium Fuel Filter — Engineered for ISX 400, ISX 600
The FS36401 fuel filter delivers exceptional filtration performance for Cummins, Kenworth ISX 400, ISX 600. Built with high-efficiency media that removes 99.9% of water and contaminants, protecting your high-pressure common rail injection system from premature wear. Direct replacement for OEM specifications at a competitive aftermarket price.
Key Features
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10 Micron Filtration — Multi-layer cellulose/synthetic media captures particles as small as 10 microns
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Water Separation — Hydrophobic barrier strips emulsified water from diesel fuel, preventing injector corrosion
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OEM-Quality Construction — Manufactured to ISO/TS 16949 quality standards with 100% end-of-line testing
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Direct Fit — Precision-engineered to match OEM dimensions and mounting points — no modifications required
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Corrosion Resistant — Coated/plated components withstand diesel fuel, road salt, and moisture exposure
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Validated for Cummins, Kenworth — Confirmed fitment across all listed applications
Compatibility
| Make |
Engine |
Year Range |
Model |
| Kenworth |
Cummins ISX 400 |
1995-2005 |
T440 |
| Kenworth |
Cummins ISX 600 |
1995-2005 |
T601 |
| Kenworth |
Cummins ISX 600 |
2011 |
T403 |
| Kenworth |
Cummins ISX 600 |
2011 |
T610 |
Always verify fitment using the cross-reference part numbers below or contact our support team.
Cross-Reference Part Numbers
| Brand |
Part Number |
| Fleetguard |
FS36401 |
| Fleetguard |
K37-1004 |
| Baldwin |
BF7892 |
| Donaldson |
P553404 |
| WIX |
WF10011 |
Specifications
| Specification |
Value |
| Part Number |
FS36401 |
| Brand |
iFJF |
| Filtration Rating |
10 Micron (Nominal) |
| Media Type |
Cellulose/Synthetic Blend |
| Product Type |
Fuel Filter |
| Application |
ISX 400, ISX 600 |
| Vehicle Make |
Cummins, Kenworth |
| Material |
Steel/Plastic Composite |
| Country of Origin |
China (ISO Certified) |
| Warranty |
1 Year / Unlimited Mileage |
Installation Guide
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Relieve fuel system pressure — Remove fuel cap and depressurize per vehicle service manual
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Remove old filter — Unscrew filter housing cap, remove old element, drain housing into approved container
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Clean housing — Wipe housing interior with clean lint-free cloth, inspect for debris or water
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Install new O-rings — Lubricate new O-rings with clean diesel fuel, seat properly in grooves
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Insert new element — Place new filter element into housing, ensuring proper orientation
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Reassemble and torque — Reinstall cap to manufacturer torque spec (typically 25-35 Nm)
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Prime fuel system — Cycle key to ON (not START) 3-5 times for 30 seconds each, or use manual primer pump
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Check for leaks — Start engine, inspect housing and connections for fuel seepage
Maintenance Schedule
For optimal fuel system protection, replace your fuel filter every 15,000-25,000 miles (or every other oil change) under normal operating conditions. For severe service (heavy towing, dusty environments, high-idle operation), reduce interval to 10,000-15,000 miles. Always replace both primary and secondary filters as a set on two-stage filtration systems.
Frequently Asked Questions
Q: How often should I replace the fs36401 fuel filter?
For ISX 400 applications, we recommend replacing the fuel filter every 15,000-25,000 miles under normal driving conditions, or every 10,000-15,000 miles for severe service (towing, dusty environments, extended idling). Always replace both primary and secondary filters as a set.
Q: What are the symptoms of a clogged fuel filter?
Common signs include: hard starting or no-start condition, engine misfire or hesitation under load, reduced fuel economy, check engine light (often P0087 low fuel pressure code), rough idle, and loss of power at highway speeds.
Q: Is this filter a direct OEM replacement?
Yes. The fs36401 fuel filter is manufactured to meet or exceed OEM specifications for fit, form, and function. It drops directly into the factory filter housing with no modifications required.
Q: Does this filter remove water from diesel fuel?
Yes. This fuel water separator filter features a hydrophobic barrier media that effectively strips emulsified water from diesel fuel. Removing water is critical for preventing injector corrosion and microbial growth in modern high-pressure common rail fuel systems.
Q: How do I know when to change my fuel filter?
Monitor for performance symptoms (hard starts, power loss), follow your manufacturer's recommended service interval, and consider fuel quality — poor-quality diesel or biodiesel blends may require more frequent filter changes.
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