The Sierra 18-7866 is a popular fuel/water separator filter designed for specific Yamaha outboard engines. It effectively removes contaminants and water from your engine's fuel supply, promoting optimal performance and longevity. Here's a breakdown of its features and compatibility information:

Features:

• 10-Micron Filtration: Removes particles as small as 10 microns from your fuel, offering superior protection against dirt, rust, and other contaminants compared to standard filters.
• High-Capacity Water Separation: The 18-7866 boasts excellent water separation capabilities, exceeding 99% removal of emulsified water from fuel. This is crucial as water can damage engine components and lead to poor performance.
• Easy Water Draining: A dedicated drain valve at the bottom of the filter allows for the convenient removal of collected water, preventing it from entering your engine.
• Maintains Fuel Flow: The filter is designed to ensure efficient fuel flow while effectively filtering contaminants and separating water. This prevents performance issues caused by restricted fuel flow.
• Durable Construction: Built with high-quality materials to withstand the harsh marine environment. Sources mention features like a corrosion-resistant design.
• Spin-On Design: Enables quick and easy installation and removal during filter changes.