LVOUP 4150 Dual-Feed AN6 Fuel Line Kit for 4150 Carburetors — Aluminum, Built-In Vacuum Gauge

This aluminum alloy dual-feed fuel line is engineered to mate with 7/8"-20 threaded 4150-series carburetors such as Holley Dominator and Quick Fuel AED. The kit converts an AN6 inlet to the factory-style 7/8"-20 carburetor threads and includes sealing hardware plus a built-in vacuum pressure gauge for quick verification of fuel delivery. It’s intended to tidy engine bays, improve feed consistency and simplify installation for performance street and strip builds.

What exactly comes in the kit and what materials are used?

The LVOUP kit arrives as a complete dual-feed assembly ready for installation. All visible components are made from lightweight aluminum alloy to resist corrosion and reduce weight compared with steel alternatives.

• Dual feed fuel line with integrated AN6 inlet to 7/8"-20 carburetor exits
• Two washers and two sealing rings for leak prevention
• One vacuum pressure gauge installed for quick diagnostics
• Aluminum alloy construction for durability and reduced corrosion

How does this kit fit and connect to my Holley 4150 carburetor?

The exit threads are 7/8"-20 to match the standard Holley 4150-series feed ports, while the inlet uses an AN6 fitting for compatibility with common braided fuel lines and AN plumbing. The kit is designed to sit in place of existing single-feed fittings and provides a dual-runner supply to the carburetor’s metering body.

• 7/8"-20 threaded exits for direct carburetor compatibility
• AN6 inlet to connect to aftermarket braided hose or AN hose ends
• Washers and seals included to reduce leak risk
• Simple bolt-in orientation—follow torque specs on your carburetor

What benefits does the vacuum pressure gauge offer during installation and tuning?

The included vacuum pressure gauge provides a quick visual check of fuel pressure behavior at the feed point, helping you confirm that both runners are supplying fuel and detect obvious pressure drops without separate test tools. It’s a convenient on-car reference during initial setup and troubleshooting.

• Immediate confirmation of fuel flow balance between feeds
• Helps spot leaks or feed restrictions early
• Useful for quick checks during tuning or track days
• Saves time by reducing need for extra gauges during install

How easy is installation and are there any special considerations?

Installation is straightforward for anyone familiar with carburetor plumbing: remove the old feed fitting, apply the supplied seals and washers, and fit the dual-feed assembly to the 7/8"-20 ports. Professional installation is recommended for first-time builders or if AN plumbing and torque procedures are unfamiliar.

• Simple mechanical design reduces installation steps
• Use thread sealant or new sealing rings as recommended
• Follow torque specs and inspect for leaks after first run
• Check hose routing to avoid heat or moving-part contact

Who this is for: The LVOUP 4150 AN6 Dual Feed Fuel Line Kit is aimed at enthusiasts upgrading or maintaining 4150-series carburetors on performance street cars, drag cars, and custom builds who need a tidy dual-feed setup with AN compatibility. It suits engine builders and home mechanics comfortable with fuel plumbing who want durable, light-weight aluminum hardware and the convenience of an integrated vacuum pressure check. If your build uses Holley Dominator, Quick Fuel AED or any 4150-based carb with 7/8"-20 threads and you plan to run AN6 supply lines, this kit provides a clean, reliable feed solution. Always confirm thread compatibility before purchasing and consider professional installation if unsure about plumbing or fuel system safety.