Fuel Cell Bulkhead Fitting -6AN to 5/16in

The Fuel Cell Bulkhead Fitting -6AN to 5/16in is a precision fuel system component designed for custom automotive builds, motorsports fuel cells, and high-performance engine conversions where reliable fluid transfer between tank and engine is critical. This straight bulkhead fitting solves a common challenge in fuel system fabrication: creating a sealed, leak-proof penetration through fuel cell walls while transitioning between different hose barb sizes and AN (Army-Navy) port standards. Whether you're building a race car, restoring a classic with a modern fuel system, or installing an aftermarket fuel cell in a project vehicle, this fitting bridges the gap between 6AN male bulkhead ports and standard 5/16-inch hose barbs with uncompromised integrity.

Constructed from aluminum and finished in hard black anodize, this bulkhead fitting delivers excellent corrosion resistance and durability in fuel applications where moisture and ethanol blends demand material reliability. The straight-flow design minimizes pressure drop across the fitting, critical for fuel delivery systems that rely on consistent flow rates under load. Included washers ensure proper sealing when installed through fuel cell bulkheads, eliminating the risk of fuel weeping at the tank penetration point—a leak vector that can compromise safety and performance. The 6AN-to-5/16-inch configuration accommodates fuel hoses of different diameters, making this fitting invaluable when interfacing aftermarket fuel cells with existing hose inventories or when stepping down line sizes as fuel travels toward carburetors or fuel injection systems.

This fitting is ideal for custom fuel system builders, race teams, and enthusiasts upgrading to external fuel cells or fabricating complete fuel supply systems from the ground up. Its compact footprint—measuring 3.54 x 1.25 x 6.3 inches—allows installation in tight engine bays and fuel cell mounting locations where space is at a premium. The straight configuration ensures maximum clearance against surrounding components, while the anodized aluminum body resists degradation from fuel additives and temperature cycling common in high-output applications. Verify that your fuel cell bulkhead opening accommodates the fitting's port geometry, and confirm hose barb compatibility with your downstream fuel lines before ordering to ensure seamless integration into your fuel system layout.