Fillcap Screw-on 3in Dia Weld-On - Black

The Aeromotive Fillcap Screw-on 3-inch Diameter Weld-On fuel filler cap assembly in black anodized aluminum is purpose-built for fuel cell and tank installations where a secure, corrosion-resistant cap solution is required. This raised cell mount design accommodates custom fuel system builds where welded mounting is the preferred method of attachment, offering a robust alternative to bolt-on systems in high-vibration or demanding fuel system environments.

The 3-inch diameter provides a standard opening size compatible with common fuel cell filler necks, while the screw-on closure mechanism delivers quick access and easy fuel cap removal without tools. Black anodized aluminum construction resists corrosion from fuel vapors, moisture, and environmental exposure—a critical advantage in motorsport applications, marine fuel systems, and off-road vehicle builds where fuel tanks experience prolonged periods in harsh conditions. The raised cell mount design positions the cap above the tank surface, simplifying installation and improving clearance for surrounding plumbing and components. Weighing 0.9 pounds, this cap assembly integrates into fuel systems without adding significant mass while maintaining structural integrity under normal operation and storage pressures.

This assembly is ideal for custom fuel cell installations, restoration projects, high-performance racing builds, and marine fuel systems where OEM caps are unavailable or incompatible with custom tank geometries. Weld-on mounting provides a permanent, leak-proof connection suited to fabricators and builders working with aftermarket or modified fuel cells. The screw-on fillcap design offers the convenience of quick fuel access without sacrificing the durability demanded by competition, off-road, or continuous-operation environments. Builders and technicians select Aeromotive fuel system components for their engineering precision and proven reliability in demanding applications.