I have a 3/4 hp submersable pump. I replaced it 3 times in 2 year. Voltage is fine 240 votls Its 150 feet in a 6" well the pump is 4" it has a 1 1/4" pipe running up to a 20 gallon pressure tank set at 40-60 psi The pumps all burnout and the propellers are never seized up and turn free please help save my marriage