Sierra 18-7866 Fuel Filter Replaces MAR-FUELF-IL-TR

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Sierra 18-7866 Fuel Water Separator Filter for Yamaha Outboards

Sierra replacement fuel water separator for use with Yamaha engines. Sierra fuel water separators remove over 99.8% of emulsified water from your gasoline. Sierra's 10 micron filters are over 90% efficient at removing particles as small as 10 micron. All filters flow at 90 GPH to feed even the hungriest motor. Sierra 10 micron filters are recommended to prevent damage to sensitive inboard and outboard fuel injection systems.


  • SAE, JIS and ISO tested and approved
  • Epoxy coated steel canister prevents corrosion from reaching your fuel system
  • Pressure and leak tested to ABYC and USCG standards
  • Independently lab tested
  • Designed to meet or exceed OEM requirements


  • Filter Size: High Capacity - 6"
  • Rating: 10 Micron for fuel injection engines
  • Thread Pitch: 11/16-16

Sierra recommends replacing your filters every 50 hours of operation or at a minimum of once per year, preferably at winterization.

Interchangeable with:

  • EMP
  • Mallory
    • 9-37807
  • Yamaha Outboard
    • MAR-10MEL-00-00

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