Well Jet

Shallow Well Jet Pump issue?
My pump suddenly began kicking once per minute. Even when water is not used. I know that leaks throughout the system. Why the system loses pressure and the need to kick? Frankly, I understand how water is under pressure in the tank Pressure …. Why not enter the water, so once the pump stops> I suspect that the jet pump has a certain type of aircraft built in which prevents water from flowing …. and that is where my problem. Is there a simple label can replace it? Your help is much appreciated in advance.
I guess the valve Holding or foot valve is leaking. It keeps the water pressure you are asking. Sometimes they start to leak, allowing the pressure to low. Usually a few deep wells is the check valve near the pump. Find a set of brass tube. E-mail if you need more help.