Check over the pumps and have a look at the flow charts at varius depths.
If you experience no water in the well, then you need a low pressure cut off switch or a franklin pumptek that shuts off on low pressure and also over cycling. http://www.franklin-electric.com/res...rotection.aspx
You will soon get other choices from many types of these devices. Simplest is the pressure switch with low pressure cut out.