Mercury - Fuel Valve Control Harness Rig Center Fuel Valve Power 84-8M0153455. OverviewThis harness gives the rig center a clean way to power a fuel valve without any homemade wiring or extra splices. It sends a steady two-amp feed, so the valve opens and closes the way it's supposed to without hesitation. The layout stays simple, which makes the rigging bay easier to understand when you're digging around later. It's a small piece, but it helps the fuel system feel a lot more settled.. Key Featu