Sierra 18-7844 Fuel Water Separator Filter 21 Micron Short

The Sierra 18-7844 is a short fuel water separator filter designed specifically for marine gasoline engines. This compact 3.875-inch filter features a 21 micron rating and is engineered to handle the challenges of modern ethanol-blended fuels commonly used in marine applications.

Superior Water Separation Technology:

Sierra fuel water separators remove over 99.8% of emulsified water from gasoline, providing critical protection for sensitive fuel injection systems. The epoxy-coated steel canister prevents internal corrosion from reaching your fuel system, ensuring long-lasting reliability in harsh marine environments.

Key Features:

• 21 micron filtration removes over 90% of particles as small as 21 microns
• Short design (3.875 inches) ideal for tight clearance applications
• High flow capacity of 90 GPH to feed even high-performance engines
• 11/16-16 thread pitch for easy installation
• Pressure and leak tested to ABYC and USCG standards
• Optimized for ethanol-blended fuels that absorb more water and particulates

Replacement Information:

Directly replaces Mercury 35-802893Q01, 35-807172, Quicksilver 35-802893Q, Mallory 9-37800, GLM 24941, Fram PS3808, and Moeller 33323-10. Sierra recommends replacing filters every 50 hours of operation or at minimum once per year, preferably at winterization.