2.5 Filler Cap & Bung - Weld-In

The 2.5 Filler Cap & Bung - Weld-In (PN6500) is a purpose-built fuel system component designed for custom automotive fabrication and engine modifications. Whether you're building a custom fuel cell, fabricating a race-ready fuel tank, or modifying an existing fuel system for performance upgrades, this weld-in filler cap addresses the need for secure, integrated fuel access without compromising tank integrity. Fabricators and engine builders rely on this component when OEM solutions don't fit custom tank designs or when welded integration provides superior strength and reliability compared to threaded alternatives.

Engineered for permanent installation, the 2.5 Filler Cap & Bung - Weld-In features a weld-in design that creates a structurally sound joint between the cap assembly and fuel tank wall. The 2.5-inch diameter opening is sized to accommodate standard fuel pump nozzles and filler hoses while minimizing tank volume loss. The weld-in bung design ensures no threading wear, no fuel leakage from loose connections, and eliminates the need for gaskets or sealants that degrade over time. This approach is preferred in race applications, off-road vehicles, and custom fabrication where vibration, heat cycling, and pressure variations demand maximum reliability and zero fuel seepage.

This component benefits fabricators, race teams, hot rod builders, and automotive engineers who design or modify fuel systems for street rods, drag cars, off-road vehicles, and custom project cars. Installation requires TIG or MIG welding expertise to ensure a clean, pressure-tight joint; proper preparation and technique are essential for fuel system safety and compliance. The compact 3.25 x 1.55 x 4-inch footprint and lightweight 0.29 lbs design make it practical for tight engine bay installations. Verify tank material compatibility and consult local fuel system regulations before welding to ensure your modification meets safety standards.