I purchased a used 1998 Kawasaki STX 1100. a few weeks back. It runs great and runs strong with no complaints in that dept. I filled the gas tank and took it out for the first time. When I arrived at the lake and launched the ski I noticed the fuel level was reading at only 1/2 full. I proceeded to use the ski, after a while it registered close to empty and the warning light flashing. I took the ski to shore to open the hood and checkthe fuel level. When I looked at its level it was still half full of gas. So it seems maybe the sender is only reading the top half of the tank? Has anyone seen this before or does anyone have any suggestions. Thank you in advance.