Started running liquidator full time approx 6-21-10. Been doing great until this morning. Wife called me at work and said the pump had lost prime. She got it primed and running and I came to check it. The in float on the liquidator had stuck and let air in the system. I moved it a little and loosened the nut a little and it started working again. Is it normal for the liquidator to drain down until the floats close when the pump turns off?? It has been doing this since installed.