I just recently bought the house. House sat empty for a while before i moved in. From day one the pipes have hammered. The well is 398' pump is at 265'. Cut in pressure is at 40, cut out is 60. At least that is what i have witnessed. So far i have been told that the check valve at the pump is bad. But there is no delay of pressure build up at cut in. Next one is that i have a bad pressure tank. But tank bladder holds pressure and does not quick cycle. i have drained and checked the pressure. i checked again today but noticed that with a drained tank and valve shut to the house that the tank built up 25# of pressure. Any suggestions?