Does anyone know where I can get a replacement fuel sender like this original equipment one? Apparently it is a "reed" device, with a sliding, buoyant donut with a magnet in the donut. It says at the top UFW-7.0 WEMA-SYSTEM W 05 200. Does anyone know what resistance it reads at full and empty positions of the magnetic donut? Can you replace just the donut? Because when I full stroke it manually, it works perfectly giving a full or empty level on the boat dash fuel gauge, but in the fuel tank, or in a test clear tennis ball container of gas, it only goes halfway up. The donut lacks buoyancy, which seems to be the only problem. This is for a 2003 Malibu Wakesetter 21 VLX. HIN: MB2K9910I203.