8AN Holley Ultra XP Carb Dual Feed Fuel Line Kit

The 8AN Holley Ultra XP Carb Dual Feed Fuel Line Kit delivers precision fuel delivery for carburetor-equipped performance engines demanding reliable, dual-feed fuel system architecture. Purpose-built for hot rodders, restoration enthusiasts, and serious carb tuners, this kit eliminates guesswork in fuel line sizing and routing by providing pre-engineered components that match the flow requirements of Holley's Ultra XP carburetors. Whether you're building a street cruiser, competition engine, or vintage restoration, proper fuel line sizing is critical—undersized lines create restriction and fuel starvation, while mismatched fittings introduce leaks and safety hazards.

This dual-feed configuration uses 8AN hose and fittings—a standard in high-performance fuel systems that balances flow capacity with compact routing in engine bays. The 8AN size (1/2-inch ID equivalent) is sized specifically to support Holley Ultra XP carburetors without restriction, enabling consistent fuel pressure and atomization across the full RPM range. REDHORSE PERFORMANCE components are constructed from premium materials with precision-engineered fittings that prevent fuel weeping, vibration damage, and pressure loss. The dual-feed design supplies fuel to both primary and secondary circuits, ensuring balanced metering during acceleration and sustained wide-open throttle operation—essential for carburetors with progressive or mechanical secondaries.

Mechanics and engine builders installing Holley Ultra XP carburetors benefit most from a pre-assembled kit that reduces fabrication time and eliminates fitment errors inherent in custom line bending. This kit is ideal for fuel pump-to-carb plumbing on street and strip cars where fuel pressure regulation and consistent flow directly impact throttle response, idle quality, and off-idle hesitation. Installation requires standard fuel system plumbing practices—secure lines away from heat sources and rotating components, verify fuel pressure is within carb specifications (typically 4–7 PSI for float-bowl designs), and pressure-test the system before first start. Compatible with mechanical and electric fuel pumps, this kit works within complete fuel system builds and simplifies upgrades to existing carbureted platforms.