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The K&N 81-0221 in-line fuel filter delivers reliable filtration for racing fuel systems with 1/4 inch lines. This sintered porous bronze filter handles high volumes at low pressure across gasoline methanol and oils in universal setups. It maintains fuel flow while trapping contaminants in performance applications.
Key Features
- 1/4 Inch Flange Diameter: Secure fit for standard 1/4 inch ID fuel hoses used in carbureted and injected racing engines.
- 1 Inch OD x 2.125 Inch Length: Compact size installs easily inline with 0.625 inch flange OD for tight engine bays.
- Sintered Porous Bronze Construction: Filters fine particles from fuels without restricting flow in demanding race conditions.
- Slide 1/4 inch ID fuel hose over barbed flanges and secure with clamps.
- Yes it fits directly on 1/4 inch ID hose with barbed 1/4 inch flanges for secure inline installation in racing systems.
- Sintered porous bronze captures contaminants down to 75 microns while allowing high fuel flow rates.
Fitment
| Fitment Status | Universal or dimensional product |
|---|---|
| Required Verification | Exact dimensions, media, connection, mounting interface, and companion part number |
Specifications
| Brand | K&N Engineering |
|---|---|
| Manufacturer Part Number | 81-0221 |
| Product Type | Air Intake Components |
| Fitment Type | Universal |
| Condition | New |
What's Included
One new K&N air intake components identified by manufacturer part number 81-0221. Hardware, adapters, clamps, hoses, filters, and service supplies are included only when stated for this exact product.
About K&N Engineering
K&N develops reusable air filtration, intake, oil filtration, fuel filtration, and related performance products for vehicle-specific and dimensional applications.
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Frequently Asked Questions
How do I confirm K&N 81-0221 fits my setup?
Match every listed dimension, flange or thread size, media type, mounting interface, and companion component. A similar shape or outside dimension alone does not confirm compatibility.
Does K&N 81-0221 require tuning or emissions verification?
Requirements vary by vehicle and intake configuration. Check the current K&N application and emissions notes, and complete any required calibration before full-load operation.
What should be checked after installing K&N 81-0221?
Verify seals, clamps, fasteners, hoses, sensors, wiring, and surrounding clearance as applicable. Check for leaks or contact, then follow the manufacturer service and reinspection schedule.
Installation Instructions
- Slide 1/4 inch ID fuel hose over barbed flanges and secure with clamps
- Compatible with AN-4 fittings or standard racing fuel line hardware
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