Mercury - Quicksilver Fuel Line Connector Fuel System Component Cast Aluminum 30635Q3. Overview. If you run an older Mercury or Mariner outboard, you know reliability starts with a good fuel connection. The Mercury Marine 30635Q3 Quicksilver Fuel Line Connector is made for vintage 3.9-9.8HP outboards (1971 and earlier) and brings back that solid, dependable seal your motor was built for. This cast aluminum twist-lock connector attaches your fuel hose to the motor securely, keeping air out and fu