I may have already sent this so please bear with me. I have a shallow well jet pump setup. I just replaced the pressure tank cuz the old one was shot. My problem is that I can pump water all day long but not get enough pressure in the tank to shut it off. I have a new 20-40psi pressure switch and have the shut off adjusted all the way out. It will shut off once in awhile but not consistently. Where should I start. It's been pretty marginal for a couple of years but like I say, I can pump and get water with no problem. I am dazed and confused.