WE have recently been losing water pressure so I went to the well house to check it out and we only showing 20 lbs or less on gauge. When I shut breaker off to pump the pressure immediately dropped to zero. I put a new check valve in my line where it come out of the ground. It stoppped the water from going back down the line but my pump won't shut off because it won't build up enough pressure to fill the bladder tank and kick off the pressure switch. There is also a lot of spitting and sputtering whenwe turn the faucet on. Is my pump junk or is my well running dry? The line leading down to the pump is approx. 175 feet deep and when I pulled the pump awhile back it was wet up to about 30 ft on the line.