Radium Engineering Remote Mount SVF Swing Valve Filler 1.5in

Capless Convenience Meets Motorsport Engineering

The Radium Engineering RAD20-1003 SVF Swing Valve Fuel Filler brings OEM-style capless convenience to any custom fuel system build using a 1.5 inch hose barb connection. Modeled directly after factory capless fuel filler designs, this billet unit features a spring-loaded swing valve door with an O-ring seal that stays closed when not in use and opens automatically under nozzle pressure, keeping debris and vapor out of your fuel line between fills. An optional dust cap and tether are included for added protection in race or storage environments. This filler is a universal accessory compatible with any fuel cell, surge tank, or custom fuel hanger build that runs a 1.5 inch filler hose, and it is NOT compatible with Radium Dry-Break fuel fillers.

Key Features

• OEM-style capless fuel filler design with spring-loaded swing valve for hands-free filling
• 1.5 inch hose barb connection compatible with standard fuel filler hose
• Spring-loaded door with O-ring seal stays closed when not in use to prevent debris entry and vapor escape
• CNC machined billet aluminum construction for long-term durability
• Optional dust cap and tether included for race storage and transport
• Compatible with gasoline and E85 fuel systems
• Universal fitment for custom fuel cells, surge tanks, and fuel hanger builds
• NOT compatible with Radium Dry-Break fuel fillers

Specifications

What's Included

• Radium Engineering SVF Swing Valve Fuel Filler, 1.5 in hose barb
• Optional dust cap
• Dust cap tether

Frequently Asked Questions

This filler uses a 1.5 inch hose barb connection. It is designed to work with standard 1.5 inch inside diameter fuel filler hose, which is the common size found on most fuel cells and custom fuel tank builds. Make sure your filler hose inner diameter matches before ordering.

No. The SVF Swing Valve Filler is not compatible with the Radium Dry-Break fuel filler system. If your build requires dry-break capability, you will need a different Radium product designed specifically for that application. This unit is a standalone capless filler for standard nozzle-style fill operations.

This filler is compatible with gasoline and E85. The billet aluminum construction and O-ring seal materials are rated for use with both pump gas and ethanol blends up to E85. It is not tested or recommended for methanol or other aggressive solvents beyond E85.

Yes. This is a universal accessory designed for custom fuel system builds, including aftermarket fuel cells, surge tanks, and custom fuel hangers that use a 1.5 inch filler hose outlet. It is not vehicle-specific and can be incorporated into any build where a capless OEM-style filler is preferred over a traditional screw cap.

The optional dust cap screws onto the filler opening and provides additional protection against dirt and debris when the vehicle is in storage or during race transport. The tether keeps the cap connected to the filler neck so it cannot be misplaced during a pit stop or fuel fill. Both the cap and tether are included at no extra charge.

The spring-loaded door applies constant closing pressure against an O-ring seat, creating a positive seal when no nozzle is present. This keeps fuel vapor contained and prevents dirt and moisture from entering the filler neck. The door opens automatically when a standard fuel nozzle is inserted and returns to the sealed position as soon as the nozzle is removed.

Yes. The 1.5 inch hose barb slips inside a standard 1.5 inch ID fuel filler hose and is secured with a hose clamp, the same method used with most fuel cells and tanks. No special tools or adapters are required. Position the filler at the desired fill point on your tank or cell, slide the hose over the barb, and clamp it in place.

Yes. The swing valve is sized and spring-tensioned to accept standard automotive fuel pump nozzles at both full-size and small-bore openings. It is modeled after OEM capless filler designs, which are engineered to open cleanly under standard nozzle pressure without the user needing to apply any manual force to the valve.

Installation Overview

1. Select the fill point location on your fuel cell, surge tank, or custom tank and verify clearance for the filler neck and nozzle approach angle.
2. Drill or cut the appropriate opening in the tank filler panel or bung if not already present, sized to allow the hose barb to pass through.
3. Slide a 1.5 inch ID fuel-rated hose over the hose barb and push it fully onto the barb until it seats against the shoulder.
4. Secure the hose with an appropriate fuel-rated hose clamp tightened to the hose manufacturer's recommended torque specification.
5. Attach the optional tether to the dust cap and to the filler neck body, then test the swing valve operation by pressing a finger against it to confirm it opens smoothly and returns to the sealed position under spring pressure.
6. Insert a fuel nozzle to confirm it opens the swing valve cleanly before filling the tank for the first time.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.