Just changed the impella the other day and after all that work it wasn`t pumping water.This is all new to me.It turns out i dont think we lined up the spout tube inside.Have not tried to fire it up again just yet.Just turned it over for a minute without starting it up.Should i have seen water coming out yet or does it have to be running.I did leave the thermostat covers off.The motor was pumping good with the last impella in. Thanks John