It is coming on and running. I have primed it several times. When I turn it off I can hear water running somewhere, but not sure where. When I turn the screw to add more water I can hear the air sucking back in, but when I pour more water it it only takes a small amount of water to fill it back up? Any idea what it is? I thought it might be the foot valve, but I would think more water would run out of the line than that.

Could be a leak in a wellpipe. How many pipes go into the well, one or two?