pressure tanks

hello, thanks in advance ,
Ok here the problem: system running fine developed small leak in pvc after pump before tank fixed leak; now can not get water to go into tank could there be an air lock? what about old teflon tape is there small office inside bladder type pressure tanks?had problems before with air but always worked its way out
thank you,oops

Do a complete drain-down and start over again.

pressure tank blues

did complete drain down.still no luck.It is big system I'm assuming it's just trapped air in tank.Line from tank goes downhill appox.20 ft. to 4 homes/trailers
also another line goes down to another 2 homes/trailers this drop is about 30-40 ft.Am i correct in belief that it is trap air inside tank as it is sitting higher than homes?