I'm not Terry but... an air leak in the suction side of a jet pump system causes a loss of prime and the water would have air in it.
The usual cause of your problem is something being blocked like the jet in the pump or the foot valve screen, or the jet in the j-body on a deep well jet in the well.
If you don't fix' this yourself, call a pump guy or well driller or only a plumber capable of pulling the plumbing out of the well. If you pull it, replace the copper with PE tubing or sch 40 PVC.
Quality Water Associates