6an to Ford EFI .435 Shank Fitting Black

The 6AN to Ford EFI .435 Shank Fitting Black from FRAGOLA is a precision adapter engineered for high-performance fuel system plumbing on modern EFI-equipped Ford engines. This straight adapter connects AN-spec fuel lines to Ford's OEM return-side EFI ports, making it essential for custom fuel system builds, carbureted-to-EFI conversions, and aftermarket fuel management upgrades. Whether you're upgrading from a mechanical fuel pump to a modern EFI system or integrating a standalone engine control unit with custom fuel delivery, this fitting ensures a leak-free, code-compliant connection between your braided AN lines and Ford's factory EFI return architecture.

Constructed from lightweight aluminum and finished in black anodize, this adapter resists corrosion and maintains structural integrity under fuel system pressure cycling. The .435 inch shank diameter matches Ford's OEM return-side EFI port specification, while the 6AN male port accepts standard -6 braided hose or hard-line fuel system components. Black anodizing not only delivers a professional appearance but also provides superior protection against oxidation and fuel degradation compared to bare aluminum. The straight-flow design minimizes turbulence and pressure loss, critical factors when managing fuel return rates on high-output or fuel-injected builds where precise pressure regulation directly impacts engine stability and emissions compliance.

This fitting is ideal for engine builders, fuel system integrators, and performance shops working on Ford-based EFI conversions and OEM upgrades. It's particularly valuable on late-model Mustangs, Coyote swaps, and Powerstroke diesel conversions where factory fuel routing must accommodate aftermarket components. Installation requires no special tools—simply thread into the Ford return port and secure your AN hose with a -6 hose end. Always verify your specific Ford model's EFI port diameter and thread pitch before ordering to ensure compatibility; this .435 inch shank design is optimized for return-side applications rather than supply-side ports.