21 Micron Fuel Filter – Complete Filter Assembly Sierra

The 21 Micron Fuel Filter Assembly is manufactured by Sierra and designed for high-performance marine fuel systems. Sierra water-separating fuel filters are available with corrosion-resistant cast alloy or cast stainless steel heads, offering flexibility and durability in harsh marine environments.

Key Features

• Micron Rating: 21 micron
• Filtration Type: Water-separating fuel filter
• Compatibility: Interchangeable with Mercury and Yamaha OEM components
• Fuel Type: Gasoline only (not suitable for diesel fuel)
• 2-Stroke Compatible: Will not separate oil from fuel, suitable for pre-mix 2-stroke fuel

Head & Port Options

• Head Materials:
  • Cast alloy
  • Cast stainless steel
• Port Sizes:
  • 1/4" NPT
  • 3/8" NPT
• Flow Rates:
  • Up to 500 LPH (125 US GPH) with 3/8" NPT ports
  • Up to 420 LPH (105 US GPH) with 1/4" NPT ports
• Design:
  • Multi-port head allows changeable inlet and outlet direction

Filter Element Details

• 21 Micron Element
  • 70 pleats for high dirt-holding capacity
  • Fuel flow: 240 LPH (60 US GPH)
  • Meets OEM specifications
• Heavy-Wall Filter Canister
  • Epoxy coating inside
  • Powder coating outside
  • Superior corrosion protection

Optional Filter Elements

• Extra-Long 10 Micron Element (S-18-7866)
  • Flow rate: 360 LPH (90 US GPH)
  • Meets Yamaha Motor Corporation HPDI requirements
  • Suitable for 2-stroke and 4-stroke outboards
  • Compatible with any of the listed head assemblies
• Johnson/Evinrude OEM Filter Element (S-18-7846)
  • Designed to meet Johnson/Evinrude OEM specifications
  • Not compatible with the head brackets listed below
  • For use with Johnson/Evinrude OEM or equivalent heads only

Kit Availability

• Kits are available for two 1/4" NPT alloy head models
• Each kit includes:
  • Complete filter assembly
  • One additional replacement filter

Complete Assembly Includes

• Filter cartridge
• Filter head
• Two brass plugs