Need some advice. Last year some friends came over and used our pool (inground with hayward max flo pump). When they left they turned the valve off that allows water to flow to the pump( thinking it was for the slide). A day and a half later when I returned I noticed what had happend. The pump had ran the entire time with no water circulation. I opened the valve and to my surprise it began pumping the water. The problem I am having is that when the pump is turned off it loses prime. We like to keep ours on a timer so that it will turn off at night and then start back up in the mornings. After this episode, it will not begin pumping again without me pouring water into it. Can this be repaired by replacing some seals or something? Any help greatly appreciated!