Attwood Mercury/Yamaha Female Hose Engine Fitting - 3/8" Barb

The Attwood Mercury/Yamaha Female Hose Engine Fitting - 3/8" Barb is a critical fuel-system component for marine engine builders and outboard technicians managing fuel-line assemblies. This fitting connects tank-to-engine fuel lines with the precision and durability that high-performance marine powerplants demand. Whether you're rebuilding a carbureted Mercury or Yamaha outboard, servicing a fuel system after seasonal storage, or upgrading fuel-delivery plumbing on a restoration project, this barbed fitting ensures a leak-free, corrosion-resistant connection that withstands years of saltwater and freshwater operation.

Constructed from solid machined brass, the fitting delivers superior chemical compatibility with unleaded gasoline, leaded fuel blends, and ethanol-blended fuels—all common in marine fueling. The 3/8" barb design grips standard fuel hose securely without requiring additional clamps in many applications, though experienced technicians often recommend dual hose clamps for redundancy on pressurized or high-vibration installations. Brass resists galvanic corrosion and won't degrade under the thermal cycling typical in outboard engines, making it a far more durable choice than plastic or aluminum alternatives when cost of failure is high and downtime is unacceptable.

Mercury and Yamaha outboard operators—from recreational boaters to commercial fishing crews—rely on OEM-compatible fittings like this to maintain factory fuel-delivery performance and warranty compliance. Installation is straightforward: slide the hose over the barb until it bottoms, then secure with fuel-rated hose clamps. This fitting integrates seamlessly into fuel-return lines, tank-to-fuel-pump connections, and carb bowl drain circuits. Always inspect hose condition before assembly and replace cracked or hardened fuel line to prevent vapor leaks and fuel odor in the bilge.