JHNRB, yeah, like i told Biff, when it first started NOT to work, i realized my power plug catched on fire. So when i looked at the plug on my pump, it was half burned but still working. SO I figured it was probably not working "properly". So went and bought another pump(same pump). It worked for a couple of days. I know I had a little air bubble in the U tube (maybe about 3 inches long by 1 inch wide-> air bubble). My water level was full. If I added 1/2 more water in my tank, it was gonna overflow! and it stopped working 2-3 days later. Now, in the U shape tube, water won t even go all the way up in the "U" part up there. there is maybe half an inch with air. The pump is plugged, and working (I hope cause this is brand new), and it dosn t suck up the air in it....