Model 4150 Fuel Line

The Holley Model 4150 Fuel Line is a precision-engineered fuel distribution manifold designed for carbureted engine builds and high-performance restorations. If you're running a Holley 4150 carburetor or planning a fuel system upgrade on a classic or modified engine, this fuel line assembly handles the critical job of splitting fuel flow from a single inlet to dual outlet ports with zero compromise on reliability. This component is essential for builders and enthusiasts who demand OEM-quality fuel delivery matched to their carb's specifications.

Built from durable steel and finished in chrome, the Holley Model 4150 Fuel Line features a 5/8-18 inch inverted flare female inlet connection coupled to dual 7/8-20 inch inverted flare male outlets. This stepped-diameter design ensures proper fuel pressure distribution and accommodates standard carb feed lines without adapter complexity. Inverted flare fittings provide superior sealing reliability compared to compression fittings, reducing leak risk under thermal cycling and vibration—critical for engines experiencing repeated heat cycles. The chrome finish resists corrosion while maintaining a clean, professional appearance in engine bays where fuel delivery systems are visible.

Carburetor builders, hot rod fabricators, and restoration shops depend on this fuel line when installing or servicing Holley 4150 carburetors in street rods, muscle cars, and vintage trucks. Whether you're upgrading from a single-feed system or troubleshooting fuel distribution on an existing build, the dual-outlet design delivers consistent flow to both primary and secondary circuits. Installation requires standard 7/16-inch and 9/16-inch flare wrenches; ensure fuel lines are 5/8-inch and 7/8-inch diameter tubing to match fitting specifications. Compact dimensions (5.3 x 0.9 x 11.5 inches) fit tight engine compartments without fouling ignition systems or intake manifolds.