K&N 81-0221 Inline Fuel Filter 1/4" Flange – High-Volume, Backflushable (Single or 12-Pack)

This compact inline filter keeps fuel delivery flowing smoothly by trapping debris while offering simple servicing — just backflush to clean. It’s built for applications that need steady volume at low pressure and is offered with a 1/4 inch flange and in single or 12-pack options. Note: Not legal for sale or use in California on any pollution controlled motor vehicle.

What kind of performance can I expect from this fuel filter?

The 81-0221 focuses on high fuel volume throughput with low pressure drop so your engine or equipment receives steady fuel flow. It’s intended for setups where maintaining volume is more important than high-pressure filtration.

• High-volume design minimizes flow restriction during operation.
• Low pressure characteristics reduce stress on the fuel system.
• Stable flow helps prevent lean spots caused by clogged inline elements.

How is the K&N 81-0221 maintained and cleaned?

Maintenance is quick: the element is designed for backflushing, which clears trapped particles without replacing the entire filter. Routine backflushing extends service intervals and lowers ongoing costs compared with disposable filters.

• Simple backflush procedure restores flow; no special tools required.
• Reusable design reduces replacement frequency and waste.
• Available in bulk (12-packs) for fleet maintenance or multiple vehicles.

Which fittings and packaging choices are available?

This model is supplied with a 1/4 inch flange to fit common low-pressure fuel lines and is sold either individually or as a 12-pack to suit one-off installs or service fleets. Choose the configuration that fits your maintenance schedule and inventory needs.

• Includes 1/4 inch flange compatible with standard hoses.
• Single units for solo replacement; 12-packs for shops and fleets.
• Compact footprint fits tight engine bays and portable equipment.

Is the 81-0221 legal for all vehicles and emissions regions?

Be aware of regional emissions and vehicle regulations: this filter is not legal for sale or use in California on any pollution-controlled motor vehicle. Confirm local legislation before purchasing for road-going vehicles in regulated areas.

• Not compliant for sale/use in California on pollution-controlled vehicles.
• Suitable for off-road, racing, or non-California regulated applications.
• Check local and state rules for aftermarket fuel system parts compliance.

Who is this for: The K&N 81-0221 is aimed at DIY mechanics, performance hobbyists, and maintenance shops that need a durable inline filter capable of high fuel flow and easy cleaning. It’s a practical choice for equipment and vehicles operating outside California emissions restrictions where a reusable, low-pressure filter is desirable.