I personally have not experienced the problem. I just bought the boat and will have to wait until next season to see exactly what the gauge says. The PO told me that he would fill it up and the gauge comes to half full. That makes me think possibly he used the 10% Ethanol and there may be some corrosion on the sender. My previous experience is with a sending unit in a Correctcraft that has a type of rheostat that can rust. I'm assuming that this is not the case with the units Matercraft uses. I will give the guys at Midwest Mastercraft a call.
Thanks for the replies.