Fuel Injection Fitting 16mm-1.50 to -6

The Fuel Injection Fitting 16mm-1.50 to -6 (ALL 50951) is a precision straight adapter designed for GM TPI (Tuned Port Injection) fuel systems and modern EFI conversions. Built by ALLSTAR PERFORMANCE, this fitting bridges the 16mm x 1.50 metric port standard to a -6 AN (Army-Navy) male connection, enabling proper fuel line routing in engine bay upgrades, restorations, and high-performance fuel delivery applications. This adapter is essential for technicians and enthusiasts who demand secure, leak-free connections when retrofitting fuel injection systems into older platforms or upgrading factory fuel rail assemblies.

Manufactured from steel and finished with zinc oxide coating, the Fuel Injection Fitting 16mm-1.50 to -6 offers corrosion resistance and durability in underhood environments. The O-ring design ensures a sealed interface at both the metric inlet side and the AN male outlet, eliminating common leak points found in threaded adapters. The straight configuration—as opposed to 45° or 90° variants—simplifies routing in tight engine bays while maintaining full flow capacity for high-volume fuel systems. At just 0.11 lbs with compact dimensions (3.5 x 0.85 x 4.5 inches), this fitting integrates seamlessly into custom and OEM fuel rail configurations without weight penalty or clearance issues.

Technicians, engine builders, and fuel system specialists benefit most from this AN-to-metric adapter when converting or restoring GM TPI-equipped vehicles to modern EFI platforms or custom fuel management systems. Installation is straightforward: thread the 16mm x 1.50 side into the fuel rail or manifold inlet port and secure the -6 AN male outlet to compatible fuel line hose or bulkhead fittings. Verify metric port compatibility before purchase, as thread pitch (1.50 mm) is critical for proper seal. Pair with -6 AN hose, bulkhead adapters, or regulators to complete your fuel delivery circuit.