I have a 04 Mobius LS with a ballast tank under the back bench seat. It filled OK but now it won't empty. When I flip the switch I hear a hum but it doesn't sound strong like a pump would. I flipped the switch about a hundred times thinking something was wearing out but it won't drain. I guess I could run around all season with it full but by winter I will have a issue. Any moomba owners have a similar problem. Thanks in advance to the forum. You guys are great and a big help.