I have a Sta-rite (sears) pump on my well, it has sat idle for 7 years or so. well I got it running and the pressure gauge goes up to 40 or so and I can get some water out of the pump outlet but not what it should be, and if I loosen the gauge I get water and some air, I cant move the regulator screw it's frozen, Does this sound like the regulator us stuck or some other problem ???