I just purchased this boat, The seller told me it takes a few min.s for water to start comeing out of the mid section, I let it run for about 3/4 min. at a time. i havent seen any water come out. I checked the impeller and it looks good,took the thermostat out, Still no water,im afraid of over heating the motor and dont want to run it long, Dose anyone know how long it should take before i start see water? please help. thanks