Diesel Oil Filters

Fleetguard FS20121 Fuel / Water Separator Spin-On Filter

Name: Fleetguard FS20121 Fuel / Water Separator Spin-On Filter
Brand: Diesel Oil Filters
SKU: FS20121
Price: 144.95 USD
Availability: OutOfStock

Heavy-duty spin-on fuel and water separator designed to remove contaminants and water from diesel fuel systems in commercial truck and fleet applications.

SKU:FS20121

$144.95 USD

Sale Sold out

Product Compatibility

Heavy-duty diesel fuel systems
Commercial truck and fleet applications
Fuel filtration and water separation systems
Severe-duty diesel operating environments
North American and global diesel applications

Specification	Value
Part Number	FS20121
Filter Type	Fuel / Water Separator
Style	Spin-On
Media Type	Synthetic (Microglass)
Length / Overall Height	10.53 in (267.36 mm)
Largest OD	4.74 in (120.30 mm)
Gasket OD	4.74 in (120.30 mm)
Gasket Inside Diameter	4.00 in (101.60 mm)
Thread Size	M95X2-7H
Rated Flow	0.92 gpm (3.50 L/min)
Hydrostatic Burst Minimum	149.93 psi (1034 kPa)
Test Specification	SAE J905

Synthetic microglass filtration media
Spin-on fuel and water separator design
Helps remove water and fuel contaminants
Supports injector and fuel system protection
Durable heavy-duty construction
Designed for commercial diesel applications
Maintains reliable fuel flow performance

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Frequently Asked Questions

Everything you need to know before ordering.

Most diesel engines require oil filter replacement during every scheduled oil change. Always follow the manufacturer's maintenance recommendations.

Fuel filter replacement intervals vary by engine and operating conditions, but many diesel engines require replacement every 10,000–30,000 miles.

You can search by part number, OEM number, engine model, or manufacturer cross-reference. If you're unsure, contact us and we'll help identify the correct filter.

Many diesel engines use a primary and secondary fuel filter system to remove contaminants and protect sensitive fuel injection components.

Yes. Many oil, fuel, air, and coolant filters have equivalent replacements across multiple manufacturers.

Most in-stock orders are processed within one business day and shipped from our warehouse.