Having problems with my Well again. Put a new pump on it and primed it but I cant get any more than 10 psi in the tank. My Well Tank should be set to 28 psi. But when I put a tire gauge on it...it reads 0. It has a bit of pressure tho because I can let some air out of the valve. When I add air to it I can hear it build pressure in the pipes. And when I remove the prime plug on the pump the air escapes. From what I described does it sound like the tank is still good and maybe the schrader valve is broke?