Mercury - Quicksilver Fuel Line Connector Fuel System Component Bayonet-Style Brass Fitting 30185Q3. Overview. If you're running a classic portable fuel tank setup, you know how important a clean, secure connection is. The Mercury Marine 30185Q3 Quicksilver Fuel Line Connector is made for vintage 6.6-gallon fuel tanks, giving you a tight, dependable link between the tank and your fuel hose. Its bayonet-style twist-lock design ensures smooth fuel flow and a solid fit, while the included barbed ho