I have a xtrol 202 tank and a gould 3/4 hp pump. A week ago I lost all water while running the shower. Moments later it was running fine with full pressure. Yesterday I came home from work and again had no water. The tank now intermitently runs to full pressure and then stops. The tank will not fill again until it is completely empty for what seems like a few minutes. We did not use any water overnight but there was no water agian this morning. I leave a tap open for a moment and then shut it off. A few moments later I hear the tank fill again. Any suggestions as to what would cause this?