I have a 2008 CK20HST that shows the fuel tank being full all the time. It worked for maybe a month or two then stayed on the full mark from then on. I have pulled the sending unit out of the tank and it is not stuck or binding, and as I raise and lower the float the fuel gauge registers. I can't see anywhere in the tank that it is rubbing or catching. Would be nice to have a sending unit that worked and not have to keep checking the fuel level visually. Any help would be greatly appreciated.