Last Saturday I had no water at all,the air tank was full of water,I replaced that and the water returned,but now the pressure is bleeding off by itself the gauge drops to 0 before the pump starts running again,I put a new 30/50 switch in and set it to 40/60lbs, can I do that,the is a lot of air in the system and some sand.I have a water softner but its closer to the house, I going to try the two cut off valves to see if I can Isolate the problem.any suggestions.slowrick