Lately, I'm getting some air in the system. I don't get any water if I release pressure from the tire valve on the pressure tank. On pressure is 28PSI off is 48, and the pressure in membrane with pump off is 27PSI (as best as I can measure). I can hear air when the tank is emptying with the pump off. Can I tell if the membrane is bad or the pump is sucking air somehow (going dry or whatever)?
TIA bob