Mercury - Quicksilver 816296Q2 Inline Fuel Filter 5/16-Inch (8mm) Fuel Lines Marine Engine Filter 816296Q2. Overview. Clean fuel keeps your engine running smooth, and the Quicksilver 816296Q2 Inline Fuel Filter is built to make sure of it. Designed for marine engines that use 5/16-inch (8mm) fuel lines, this simple inline filter traps the moisture, rust, and fine debris that can rob your engine of power.. It's compact, easy to install, and tough enough for real marine use - whether you're runnin