I just purchased a used Craftsman 1 hp deep well jet pump model #390.252283. Hooked it up and it will not cut off, does not seem to be putting any water in the pressure tank. I have pulled the lines and took off the foot valve and the injector? and tried to flush them to see if they are stopped up, did get some debris out of the injector. When it is primed it does seem to have pressure at the pump and it did get better about getting some water to the hydrant, but will not cycle off, have tried adjusting the pressure switch? to lower the cut on/cut off point but with no success. Any suggestions? The well is about 40 to 50 foot.