@chrislandy That is definitely a problem (malfunction) with the sender system
@ProStah_Skiah Filling to full occasionally isn't enough to keep it accurate. Unless you fill each time between a full fill with gas from the same tank at gas station, it can get off. Ethanol % can vary even between various tanks of 10%. 10% means it can be up to 10%. So one tank could be 7%, the next could be 9%. Thats enough to throw it off significantly.
This fuel sender system is just a very poor choice. I was going to say for a tournament ski boat, but there are probably many other vehicles this would be problematic in. If you have your own tank, and fill the boat up everytime that tank is filled, then you can use partial fillups. Thats about the only situation I can think of that it works well. For those, like us, that trailer their boat whenever used it works ok. I never fill partial, if I may need gas while out I go ahead and fill up. For those on a lake, especially a ski school or ski club....its a very bad system. I think the management system is a weak work around for a poorly chosen system. Instead of a workaround, how about choosing a system that works.