This black anodized billet aluminum 3/8-inch hose barb adapter is designed to replace the OEM brass fuel fitting 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 line to a 3/8-inch hose barb, the adapter allows improved fuel flow for high-performance and racing applications where a steady fuel supply is essential.
 
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 fuel system fittings to (Mercury OEM Part Numbers 7900, 7901, 816875, 22-816875, 94282, 22-94282, 816876, 22-816876 and others) to larger fuel lines to support higher fuel demand. This billet adapter provides a clean and reliable way to increase fuel flow capacity while maintaining proper fitment with the factory carburetor threads.
 
Direct Replacement for Mercury Carburetor Fuel Ports
The adapter threads directly into the OEM fuel inlet port located on the carburetor float bowl, replacing the original brass fitting with a stronger billet aluminum component. It is compatible with Mercury WH, WMV, and WMH carburetor series, which were widely used 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 installed on Mercury 2.0L, 2.4L, 2.5L, 3.0L two-stroke engines produced from the late 1970s through the early 2000s. Many of these engines are still widely used today in bass boats, fishing boats, and performance builds, where consistent fuel delivery is critical.
 
Durable Black Anodized Billet Construction
Each adapter is precision-machined from billet aluminum and finished with a black anodized coating. The anodizing process creates a hardened aluminum oxide layer that is electrolytically dyed black using metal salts. This finish is significantly stronger and more wear-resistant than raw aluminum.
 
The result is a fitting that resists corrosion, scratching, chipping, and flaking, making it well-suited for the demanding conditions commonly found in marine and racing environments.
 
Increased Fuel Flow for Performance Applications
Upgrading the fuel inlet size from 1/4-inch to 3/8-inch allows greater fuel volume to reach the carburetor. This can be beneficial for engines running larger jets, modified carburetors, or high-RPM performance setups. For Mercury V6 fishing engines, bass boat setups, or racing powerheads, improved fuel flow helps maintain consistent delivery under hard acceleration and sustained load.
 
Product Details
This listing includes one (1) 3/8-inch billet aluminum hose barb adapter designed to thread directly into the OEM Mercury carburetor float bowl fuel port using the factory NPT/MPT thread.
 
Note: The Super Flow Manifolds assemblies are available on this website.
 
For owners maintaining or upgrading Mercury WH, WMH, or WMV carburetors, this billet adapter provides a simple and durable way to improve fuel delivery while replacing aging factory brass fittings with a stronger performance component.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.