Sierra Fuel Water Separator Filter – Long 21 Micron

Sierra Fuel Water Separator Filter – Long 21 Micron is a replacement marine fuel filter designed to help protect your engine from water, dirt, and other harmful contaminants in the fuel system. Built for use on many Mercury and MerCruiser applications, this long-style spin-on filter delivers 21-micron filtration with over 90% efficiency and a 90 GPH flow rate to support dependable fuel delivery and smooth engine performance. It is also approved for ethanol-blended fuel, making it a practical choice for modern marine maintenance.

Key Features

• 21-Micron Filtration: Helps capture water and debris before they reach sensitive fuel system components.
• High Fuel Flow: Rated at 90 GPH to support a wide range of 2-cycle and 4-cycle marine engines.
• Marine-Ready Construction: Epoxy-coated internal design helps resist corrosion in harsh boating environments.

Sierra designed this fuel water separator filter for boat owners who want reliable protection during routine service, seasonal maintenance, or fuel system repairs. The long filter format measures approximately 4.35 inches in length and fits many common marine fuel water separator setups. By reducing water and particulate contamination, it can help improve fuel economy, maintain engine performance, and support easier starts on the water.

This Sierra filter replaces a range of OEM and aftermarket applications used by Mercury, MerCruiser, Yamaha, Volvo Penta, Crusader, and Mallory. Whether you are servicing an inboard, sterndrive, or outboard fuel system, Sierra offers a trusted aftermarket solution for consistent filtration and dependable engine protection.