Mercury - Quick Disconnect Fuel Line Fitting Fuel System Series Marine-Grade Construction F197787Q3. Overview. Every boater knows the feeling - that quiet confidence when your engine fires right up and the fuel system does exactly what it should. There is comfort in those steady moments before you push away from the dock, knowing the connection between your tank and your outboard is secure and dependable. The Quicksilver F197787Q3 Quick Disconnect Fuel Line Fitting brings that kind of trust to y