4150 Carburetor Fuel Line Kit AN6 Dual Feed with Gauge - Clean Fit

In this review of the 4150 Carburetor Fuel Line Kit AN6 Dual Feed with Gauge, the bottom line is straightforward: this kit is for builders and tuners who need a compact, tidy dual feed solution for any 4150 based carb with 7/8'-20 thread and want an easy way to monitor vacuum pressure. The reviewer found the kit useful for cleaning up the engine bay and providing a controlled feed to Holley style carbs, though installation care and correct sealing are crucial to avoid the mixed sealing reports some customers experienced.

Key Features

• Dual feed design: Provides a proper pair of fuel feeds to a 4150 based carburetor to improve fuel distribution under load.
• AN6 fittings: Uses AN6 entrance fittings for common aftermarket hose compatibility and robust connections.
• 7/8'-20 exit: Threads directly into Holley Dominator and 4150 series carbs with the specified 7/8'-20 fitting for straightforward fitment.
• Built-in pressure gauge: The vacuum pressure gauge helps dial in fuel pressure and keeps the engine bay neater by combining functions into one assembly.
• Aluminum alloy construction: The machined aluminum alloy body resists corrosion and provides long service life when installed correctly.
• Simple installation: The kit's uncomplicated structure aims to make installation faster for experienced hobbyists and professional shops.

Who It's For

This kit suits engine builders, weekend racers and street performance enthusiasts running a 4150 based carburetor, including Holley Dominator and similar models with 7/8'-20 threads. It is especially useful for those who want a cleaner engine bay and a visible vacuum pressure reference without adding multiple separate fittings.

Those who should look elsewhere include owners running carburetors that do not use 7/8'-20 threads or users who require integrated braided hose with the kit rather than a hardline fitting; also, customers uncomfortable with plumbing fuel systems should seek professional installation to ensure leak-free seals.

Pros & Cons

Pros

• Clean, compact dual feed assembly simplifies routing and looks tidy in the engine bay.
• AN6 inlet and 7/8'-20 exit match common aftermarket plumbing and Holley style carbs for easy compatibility.
• Aluminum alloy construction offers durability and corrosion resistance when properly installed.
• The included pressure gauge provides a quick visual of vacuum pressure during tuning and troubleshooting.

Cons

• Some customers have reported inconsistent sealing; careful installation and correct use of the supplied washers and seals are required.
• Hoses are not included, so additional hose and fittings may be needed to complete an installation.

Specifications

Material	Aluminum alloy
Color	As picture shown
Entrance	AN6
Exit thread	7/8'-20
Application	Fit for Holley Dominator 4150 Series 7/8'-20 thread
Package includes	Dual feed line, 2 washers, 2 sealing, pressure gauge

Our Verdict

The 4150 Carburetor Fuel Line Kit AN6 Dual Feed with Gauge is a practical, value-minded choice for anyone installing or upgrading a 4150 based carburetor who wants a tidy dual feed and a gauge for setup. When installed carefully with proper seals and complementary hoses, it delivers durable service and a neater engine bay, though buyers should plan to source hoses and follow professional installation guidance if unsure.

Frequently Asked Questions

Will this fit my Holley 4150 or Dominator carb?
Yes, it is designed for 4150 based carbs with a 7/8'-20 thread, including Holley Dominator and similar models.

Are hoses included with the kit?
No, the kit includes the dual feed line, washers, seals and a pressure gauge but does not include hoses; you will need AN6 compatible hose and fittings.

Is installation difficult for a home mechanic?
The structure is simple, but correct sealing is essential; professional installation is recommended if you are not experienced with fuel systems.