HAHAHA. I guess it's more of a requirement than a stragedy. When you move the U tube off of the impeller, does the water level in that chamber change at all? Is there any water coming out of the overflow section of that chamber? In any case, it seems like the U tube isn't in the perfect position. Sometimes the U tube wont fit correctly and will take a lot of "finaggling" to get it to snap into the right position.