Phil, Yes, both tanks were topped off. I tried shutting the boat down, key off, didnt clear the problem. Switched to the right tank with no alarm, then back to the left, problems came back.I know it is isolated to the left tank, and I thought it was probably the sending unit. I just thought I would ask for direction before I sent it to Bowden for repair, because I didnt know if there was some sort of reset procedure. I am assuming it is the sending unit in the left tank, because the problem dissappears when it is running off the right tank.I will call parts and order a sending unit, if you think that is the problem!James