Billet Filler Neck - Small Design

The Billet Filler Neck - Small Design by MOROSO is a precision-engineered weld-on fuel filler neck assembly designed for custom and performance vehicle builds. Built from lightweight aluminum, this universal component eliminates the need for expensive OEM filler necks while offering superior durability and a clean appearance. Whether you're fabricating a custom fuel system, restoring a classic vehicle, or building a race car, this small-format filler neck provides a reliable, professional solution for fuel tank access and cap mounting.

This billet filler neck features a cap-style design that secures tightly while maintaining easy access for fuel fills. The assembly includes a 1/16 inch NPT threaded port—ideal for fuel level sensors, vent lines, or auxiliary fuel system components—and a 1/4 inch hose barb fitting for flexible fuel line connections. Constructed from solid aluminum in natural finish, the small design minimizes interference with engine bay components and underhood packaging, making it suitable for tight installations. The weld-on mounting system ensures permanent, vibration-resistant installation when properly secured to your fuel tank or fabricated fuel cell.

Fabricators, hot rod builders, and motorsports enthusiasts benefit most from this lightweight, universal filler neck assembly. Its compact small footprint works well in custom tube-frame chassis, mid-engine conversions, and engine swaps where space constraints limit standard fuel filler options. Installation requires welding to the fuel tank or fuel cell, and the included hose barb fitting simplifies fuel line connections. Verify tank opening dimensions and port thread compatibility before ordering to ensure proper fit for your specific application.