Sierra 18-7945 10 Micron Long Fuel Water Separator Filter Sierra fuel water separators remove over 99.8 of emulsified water from your gasoline. Sierras 10 micron filters are over 90 efficient at removing particles as small as 10 micron without starving your engine. Sierra canister fuel water separator filters are designed to be an exact fit and performance replacement for your current OEM canister filter, for easy installations. Sierra 18 7945 Fuel Water Separator Filters are recommended to prev