My 2015 2275 GCW fuel gauge is pegged on Full with the ignition switch On and drops to Empty with the switch off. Everything else electrical on the boat works fine. What are the likely cause(s) for this problem? Here is a link to a photo of my sender and technical details: http://www.wemausa.com/sensors/level-FuelWater.shtml#.W1t5QdJKhaQ The round float rides up and down on a large diameter shaft so I think it's unlikely to be stuck. The boat has 165 hours on it. There is a unconnected black and a purple wire in the helm panel wiring harness that could be related to the problem? The Tachometer and Trim gauges work fine. Thanks for any assistance.