HiYa! my deep well is @260 feet deep, it has a submersible pump in there (looks like a 4' long torpedo) and we have a 5 gal pressure tank up top. its been working fine for years, now its gone wierd on me. ya pump about 5 or 10 gal and the water stops.... if you wait about 2 min, it comes back on with really high pressure that drops off after a few min. Then you can pump another 10 gal maybe more if your lucky then it stops... wait a few and it comes back on, high pressure. it will drop pressure steady till its flowing about 3 gal a min and it stops. at its high pressure when it comes back on its running about 7 gal amin. Normally, its always pumped out a steady 5 gal a min, and often I have forgotten the horses water hose and its pumped all day, no worries. I havent done that since I got a water float for them a year or so ago. before I call the well guy at $$$$$$$$$$$$$$$$$ an hour, IF I know whats wrong I can fix it myself. any ideas??