I bought a 2000 410 nov.2009 and was able to use it very little befor I had to winterize it. But I noticed that the vacuflush would not stop running most of the time unless I lightly touched the spring on the switch on top of the tank then it would stop. Some times until it was used again and sometimes it would start back up on its own. Is this because the switch is bad or could it be something else like duck bills. I bought a new switch from marine max and the spring on the switch was much larger than the origanal and the pump still would not shut off on its own.:smt100