Endura Fuel Pump Fitting 5/8-18 to #6

The RUSSELL Endura Fuel Pump Fitting 5/8-18 to #6 AN is a precision straight adapter engineered for high-pressure fuel system connections in performance and custom applications. This adapter bridges a 5/8-18 inch inverted flare male port to a #6 AN (−6) male connection, enabling seamless integration between legacy or OEM fuel line standards and modern Russell ProFlow fuel delivery systems. Constructed from steel with zinc oxide coating, the fitting delivers corrosion resistance and structural durability in demanding under-hood environments.

The inverted flare design on the 5/8-18 side provides a proven seal for vintage carburetors and mechanical fuel pumps, while the #6 AN outlet accepts standard braided stainless or PTFE fuel hose with AN fittings. The straight configuration eliminates elbow flow restrictions and simplifies plumbing in space-constrained engine bays. Russell's zinc oxide finish resists oxidation and maintains a professional appearance through repeated thermal cycles and vibration exposure inherent to automotive fuel systems.

This adapter suits builders transitioning classic fuel systems to modern Russell fuel delivery components, carb-to-EFI conversions, and custom fuel line routing where mixed thread standards require transition. Vintage drag racing, street rod, and restomod projects frequently encounter these adapter requirements when upgrading from original equipment to regulated fuel systems or high-flow pump platforms.

RUSSELL fittings are recognized across the automotive performance industry for precision manufacturing and repeatability. The 5/8-18 inverted flare standard remains common on carburetors and mechanical pumps built through the 1990s, making this adapter a practical solution for modern fuel system upgrades in classic platforms.