Upgrade your boat fuel filter with the Quicksilver® Mercury® Fuel Filter Kit. This Quicksilver marine fuel filter brings industry-leading performance and reliability. The Quicksilver Mercury Fuel Filter Kit fits all Mercury and Mariner® V6 EFI and OptiMax™ outboard engines 1996–present. Manufacturer model #: 35-18458Q4. Mercury boat fuel filter. Industry-leading performance and reliability. Fits all Mercury and Mariner V6 EFI and OptiMax outboard engines 1996–present.