Mercury - Quicksilver Fuel Line Connector Fuel System Component Brass and Composite 22831Q3. Overview. If you run an older Mercury or Mariner outboard, you know how much the small things matter. The Mercury Marine 22831Q3 Quicksilver Fuel Line Connector is one of those details that makes your setup run right. It's designed for vintage TwoStroke engines built in 1971 or earlier, giving you a tight, dependable connection between the fuel tank and the motor. The twist-lock fitting snaps in securely