Sierra 18-7866 10-Micron Fuel Water Separator for Yamaha MAR-FUELF-IL-TR | High Capacity

Overview

Marine fuel integrity matters for reliable starts, steady performance, and smooth cruising. The Sierra 18-7866 is a high-capacity, 10-micron fuel water separator designed to work with Yamaha MAR-FUELF-IL-TR installations. It focuses on removing moisture and fine particulates before fuel reaches the engine, helping maintain clean fuel delivery in challenging marine environments.

What it does

This filter targets emulsified water and microscopic contaminants that can accompany gasoline in marine systems. By combining a proven 10-micron rating with a generous flow rate, it supports steady fuel supply while guarding sensitive fuel injection components.

Key benefits

• Removes over 99.8% of emulsified water from gasoline, reducing water-related fuel issues
• 10-micron filtration to limit tiny contaminants that can affect fuel quality
• High capacity housing and a 90 GPH flow to feed even larger or hungrier engines
• 6-inch (152.4 mm) length for robust filtration capacity
• Universal fit design for compatibility across marine systems
• Replaces Yamaha MAR-FUELF-IL-TR with a like-for-like fit and performance

Fit, compatibility, and installation

Engineered to support inboard, sterndrive, and outboard fuel injection setups, the Sierra 18-7866 is built to withstand the harsh marine environment. The universal-fit approach helps streamline replacements and upgrades in many Yamaha-based installations.

Real-world use and outcomes

In day-to-day boating, you might notice more consistent fuel delivery and fewer fuel-system complaints in engines that previously showed signs of moisture or fine particulate contamination. While results can vary with fuel quality and operating conditions, the filter is positioned to reduce water content and improve fuel cleanliness over time. Consider pairing this filter with regular maintenance checks and proper storage practices to support engine performance during saltwater seasons and long runs.

Specs at a glance

• Part number: 18-7866
• Micron rating: 10
• Flow: 90 GPH
• Length: 6 inches (152.4 mm)
• Fitment: Universal ( Yamaha MAR-FUELF-IL-TR compatible)