Hello all, My Deep well jet pump (well is approx. 80' deep) pump has 30-50 switch, and pressure tank is set at 28psi, and although old, is not leaking air or water. Problem started a couple of weeks ago where I would lose pressure over about 20 minutes, thus making the pump kick back on and recharge to 50psi. I shut the valve to the house off , and still had problem. I pulled the well, replaced the foot valve, all fittings, as well as the ejector assembly since I was going through all the trouble, put it all back together and primed the system All was working well, except same problem was still there. Now it is getting much worse and I lose the pressure in about 4 minutes. I assume I must have a leak somewhere in the lines, and am waiting for warmer weather in 3 days to pull it. Funny thing I noticed though, if I shut the pump off, overnight and close the house valve I have to re-prime it to get it going. If I shut the pump off, and close the valve between the pump and the pressure tank, I don't have to re-prime as the water is still in the lines and pump and doesn't appear to leak out? Is it possible for it to only leak with some pressure on it, or am I missing something here? the order of my system is (well, pump, shutoff valve, pressure tank, and shutoff valve to the house.) Thanks.......