The air injector should put air in the bladderless tank. So you don't need a bleeder orifice or check valve above ground. You wouldn't want to squirt air through the sediment filter anyway, so this would need to move if you have a bleeder orifice. With the tank empty of water, it will have about the right amount of air when you turn on the pump. No need to add air to the tank, your injector should do that for you.