Mercury - Quicksilver Fuel Line Connector Secure Marine Fit 804786Q. Overview. When it comes to fuel delivery, even the smallest part matters. The Mercury Marine 804786Q Quicksilver Fuel Line Connector gives you a tight, reliable seal between your fuel line and outboard - no leaks, no worries. Built tough for marine life, it's engineered to handle vibration, pressure, and constant exposure to water. Whether you're idling through the marina or running wide open, this connector keeps your fuel lin