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Have the dealer check it when you go in for your next service. Open the fuel hatch and make sure everything is plugged in. An open circuit may default to 100%....not sure about that though. Or unplug the level sensor and see what the gauge does. Not sure how Yamaha sets up their fuel circuits, but unplug it and see if the gauge changes. The pump and sensor MAY be in the same connector, but you should see the gauge change. Cycle the key, it may need to update.
