Does sound as though your tank is watterlogged.
Just to double check the procedure, be sure when you checked the pressure and added the air, you shut off the water pump and opened a faucet. If the air did leak out through the shrader valve and the tank filled with water, you'll find that it will take very little air. Since water is non-compressable, a small shot of air will pressureize the tank if the faucets are closed. Since such a tiny bit of air can be added, it will usually just escape again when the pressure is checked again.
By trying to add air with the faucets open and water pump and city water disconnected, the air will push the water out of the tank and empty the internal bladder inside the accumulator if it is still intact. Once the tank is empty, you now pressurize the tank and to 20 PSI as a pre-charge on the tank. After precharging the tank, when you turn the pump back on, it will pump water into the tank compressing the air until the tank pressure reaches the cut of limit of the pump. Once pressurized, you can then flow water until the tank reduces to the turn on pressure again of the pump.
Good luck with it.
__________________
Joe & Shelly, Justin, Tyler, Alyssa | Butler PA 2008 Tiffin Allegro Bus 43QRP|Cummins 425|Honda CRV
|