Aluminum Weld Bung -12AN Female

The Vibrant Performance Aluminum Weld Bung -12AN Female (VIB11164) is an essential fuel system component for custom engine builds and high-performance fuel line routing. This weld bung serves as a threaded port termination point, allowing you to seal off unused fuel rail bungs or create custom fuel delivery points in fabricated intake manifolds and fuel rails. Whether you're upgrading a carbureted engine to EFI, tuning a forced-induction setup, or building a race-spec fuel system, this component provides a clean, leak-free closure or branch point for -12AN fuel lines.

Constructed from lightweight aluminum alloy, the Vibrant Performance weld bung is engineered for direct welding into fuel rail bungs or manifold ports without deformation or metallurgical failure. The -12AN female thread specification (16mm x 1.5 ISO thread) accepts standard -12AN fuel line fittings, hose adapters, and pressure test ports commonly found in modern fuel systems. The compact 3.55-inch length and 0.9-inch diameter allow installation in tight engine bay environments without interfering with ancillary components. Aluminum construction keeps system weight minimal while maintaining full pressure integrity in carbureted, port-injected, and direct-injected applications up to typical fuel system pressures.

This weld bung is ideal for engine builders, fuel system integrators, and fabricators developing custom EFI conversions or competition fuel systems. Professional mechanics often use aluminum weld bungs to create secondary fuel ports for boost-referenced fuel pressure regulators, bypass lines, or temporary gauge ports during diagnostics. The -12AN female fitting ensures compatibility with aftermarket fuel rails, surge tanks, and fuel pressure regulators from manufacturers like Aeromotive, Russell, and Speedway Motors. Installation requires TIG or MIG welding directly onto manifold bungs; allowing proper cooling time ensures thread integrity for secure fitting engagement.