This precision brass 3/8-inch hose barb adapter is designed to replace the OEM fuel fittings installed in the float bowl fuel ports of Mercury WH, WMV, and WMH carburetors. By increasing the fuel connection from the factory 1/4-inch fuel line to a 3/8-inch hose barb, the fitting supports greater fuel flow for high-performance and racing applications where a consistent fuel supply is critical.
Many builders running Mercury V6 two-stroke engines—including 2.0-liter, 2.4-liter, 2.5-liter, and 3.0-liter carbureted outboards—upgrade their carburetor fuel fittings to support larger fuel lines and improved fuel delivery. These adapters provide a clean and reliable way to increase fuel flow while maintaining proper fitment with the original Mercury carburetor threads.
Common Mercury fuel fitting part numbers referenced in this upgrade include 7900, 7901, 816875, 22-816875, 94282, 22-94282, 816876, and 22-816876, along with other similar OEM carburetor inlet fittings used across multiple Mercury carburetor models.
Direct Replacement for Mercury Carburetor Fuel Ports
This brass adapter threads directly into the OEM fuel inlet port located on the carburetor float bowl, replacing the original fitting with a durable high-flow component. It is compatible with Mercury WH, WMV, and WMH carburetor series, which were widely installed on engines such as the Mercury 135 HP, 150 HP, 175 HP, 200 HP, 225 HP, and 245 HP V6 outboards, including XR2, XR4, and XR6 models.
These carburetors were commonly used on Mercury 2.0L, 2.4L, 2.5L, and 3.0L two-stroke engines produced from the late 1970s through the early 2000s. Many of these engines remain popular today in bass boats, fishing boats, and performance builds, where reliable fuel delivery is essential.
Durable Marine-Grade Brass Construction
The adapter is manufactured from solid brass, a material long favored in marine fuel systems for its durability and corrosion resistance. Brass provides excellent compatibility with fuel system components and offers dependable sealing performance when installed in carburetor float bowls.
Its robust construction resists corrosion, vibration, and wear, making it well suited for marine environments where exposure to fuel, moisture, and engine vibration is common.
Increased Fuel Flow for Performance Applications
Upgrading the carburetor inlet from 1/4-inch to 3/8-inch allows greater fuel volume to reach the carburetor. This can be particularly beneficial for engines running larger carburetor jets, modified carburetors, or high-RPM performance setups.
For Mercury V6 fishing engines, bass boat performance builds, and racing powerheads, improving fuel flow helps maintain consistent fuel supply during hard acceleration, sustained throttle, and high-load operation.
Product Details
This listing includes one (1) brass 3/8-inch hose barb adapter designed to thread directly into the OEM Mercury carburetor float bowl fuel port using the factory NPT/MPT thread.
These fittings are often used when upgrading fuel systems or installing larger fuel lines in high-performance Mercury carbureted engines.
Note: Our Super Flow Manifold assemblies designed for Mercury carburetor fuel systems are also available on this website.
For owners maintaining or upgrading Mercury WH, WMH, or WMV carburetors, this brass adapter provides a durable and reliable way to increase fuel delivery while replacing aging factory fittings with a stronger high-flow component.
For technical support contact Mike Hill at mike@buckshotracing77.com or call +1-714-697-1716