#6 x 5/8 -18 Fuel Pump Adapter Fitting

The #6 x 5/8-18 Fuel Pump Adapter Fitting by Russell is a precision-engineered AN-to-NPT adapter designed for professional fuel system modifications and custom automotive builds. This straight adapter connects AN-sized fuel lines to NPT-threaded fuel pump inlets, carburetor ports, or fuel filter housings, making it essential for hot rod enthusiasts, EFI conversions, and engine swaps where OEM fuel system plumbing doesn't align with aftermarket fuel delivery components. Whether you're installing a carbureted engine in a modern bay or upgrading a classic street machine to modern fuel management, this adapter provides reliable, leak-free transitions between different thread standards.

Constructed from steel with a zinc oxide finish, the Russell fuel pump adapter resists corrosion in harsh underhood environments and maintains structural integrity under fuel system pressure. The 6 AN male connection accepts standard -6 braided stainless or rubber fuel hose with standard 37-degree JIC fittings, while the 5/8-18 NPT male thread pattern engages directly into factory or aftermarket fuel pump bungs. The straight design eliminates flow restrictions and simplifies installation in tight engine compartments, and the compact footprint (2.7 x 1.9 x 5.75 inches) allows routing flexibility around headers, intake manifolds, and other modified components. Zinc oxide plating provides corrosion protection without adding bulk, ensuring long service life in wet climates and high-vibration environments.

This adapter is indispensable for engine builders transitioning classic fuel systems to modern fuel pumps, converting carbureted platforms to electronic fuel injection, or adapting universal fuel system components to vehicle-specific installations. Mechanics working on street rods, muscle car restorations, and performance builds rely on Russell adapters to create professional, code-compliant fuel plumbing that meets safety and reliability standards. Compatible with any fuel pump featuring 5/8-18 NPT inlet ports and any AN-6 fuel hose assembly, this fitting bridges the compatibility gap between different manufacturers and standards. Always verify thread size and hose AN rating before installation, and test all connections under pressure to confirm proper sealing on your specific application.