Quicksilver Replacement Composite Float 8673 for Mercury 3.9–150hp Outboards — OEM Fit Restores Fuel Control

The Quicksilver 8673 replacement composite float restores proper carburetor fuel control in select Mercury 3.9–150hp 2-stroke outboard engines.

When a carburetor float fails—sinking, leaking, or sticking—fuel level and engine performance suffer. The Quicksilver 8673 is a direct-fit composite float designed for specified Mercury 2-stroke 3.9–150 horsepower outboards, manufactured to meet Mercury Marine original equipment specifications. It’s intended as a like-for-like replacement to help return reliable fuel metering and reduce fuel overflow or starvation issues that can cause hard starting, rough idling, or flooding.

Which engines and carburetors use the Quicksilver 8673 float?

This float fits select Mercury 2-stroke outboards in the 3.9 to 150 horsepower range. Always confirm compatibility using your owner’s or service manual and the engine’s parts diagram before ordering. If your parts listing cites the 8673 float number, this Quicksilver unit is the OEM-quality replacement.

• Designed for specific Mercury 2-stroke 3.9–150hp models
• Intended as a direct replacement for floated carburetor assemblies listed in parts diagrams
• Check engine serial and model numbers against service manuals for exact fit

How does replacing the float improve outboard performance?

A healthy float maintains the correct fuel level inside the carburetor bowl so the engine receives the right air-fuel mixture. Replacing a worn or damaged float reduces fuel overflow, prevents flooding, and helps stabilize idle and throttle response. It’s a small part with a direct effect on drivability.

• Prevents fuel overflow and wet spark plugs
• Helps maintain consistent idle and acceleration
• Reduces risk of fuel starvation at various engine loads

What should I inspect or replace while servicing the carburetor?

When you remove a faulty float, it’s a good practice to inspect the float needle, seat, gaskets, and carburetor bowl for wear or debris. Replacing associated seals and gaskets at the same time avoids repeated disassembly later and ensures a reliable seal and operation. Follow the service manual for torque specs and assembly order.

• Inspect float needle and valve seat for wear or corrosion
• Replace carburetor gaskets and bowl o-rings as recommended
• Clean passages and jets to prevent clogging before reassembly

Is the Quicksilver 8673 a genuine OEM-quality part?

Yes. The Quicksilver brand supplies parts engineered to meet Mercury Marine original equipment specifications and undergoes rigorous testing for marine applications. Choosing this replacement means you get materials and tolerances intended to match original performance and longevity.

• Manufactured to OEM standards for fit and function
• Built from composite materials resistant to fuel exposure
• Backed by Quicksilver’s long history in marine parts and accessories

Who is this for? The Quicksilver 8673 composite float is aimed at boat owners, marine mechanics, and service shops maintaining Mercury 2-stroke outboards in the 3.9–150hp range who need a reliable, OEM-spec replacement component. It’s ideal for routine carburetor repair or rebuilds where restoring proper fuel level control is essential. Always consult your parts list or service manual for model compatibility and installation guidance before purchasing and installing this float.