Mercury - Quick Disconnect Fuel Line Connector Fuel System Component Brass and Composite 13563T3. Overview. A fuel system is only as good as its connections. The Mercury Marine 13563T3 Quick Disconnect Fuel Line Connector gives you that solid, no-leak fit between your outboard and fuel line that makes starting smooth and running steady. Built for Mercury, Mariner, and Force engines, it locks in place with a clean, confident click. It's the kind of simple, rugged part that boaters come to trust -