My chugger pump worked fine all of last year. After a winter of not brewing I just set up my equipment to run some water through and test for leaks before doing my first brew. When I kick on the power the pump motor runs and sounds just like it always had but it doesn't actually move any water. It's primed and all of the valves are open. When I first turn it on I can see the water level in the output tubing jump up an inch or so then nothing. Anybody encountered this before?