Sierra 18-7846 Marine Fuel Water Separator Filter 21 Micron

The Sierra 18-7846 is a high-performance 21 micron fuel water separator filter designed specifically for marine engines. This canister-style filter element is engineered to remove over 99% of emulsified water from gasoline while maintaining optimal fuel flow rates for demanding marine applications.

Key Features:

• 21 micron filtration with over 90% efficiency at removing particles as small as 21 micron
• High pleat count filter element with steel end caps for maximum capacity and durability
• Epoxy-coated interior for superior corrosion protection in harsh marine environments
• Powder-coated exterior housing for added corrosion resistance
• Heavy-duty spring construction for reliable performance
• 90 GPH flow rate to feed high-performance engines
• Will not separate 2-cycle oil from gasoline
• Thread pitch: 1"-12
• Filter height: 4.3 inches

Ideal as a primary filter for marine fuel systems, especially when used with ethanol-blended fuels that absorb more water and loosen more particulates than conventional gasoline. This filter meets OEM specifications and is designed to protect fuel pumps and injectors from contamination damage.

OEM Cross References: Replaces Johnson/Evinrude 502905, Crusader 98041, GLM 24930, Mallory 9-37803, Quicksilver 8M0061975, and Volvo 3851218-2. Recommended replacement interval: every 50 hours of operation or annually at winterization.