We have a 16' drop well with 20' horizontal pipe to the pump. The pump is a 1/2 horse convertible Craftsman jet pump. The bladder is 2.5 gallons. The single 1.5" pipe goes to the bottom of the well; the 1 1/4" and 1" hose from the pump are only about 2' long. The pump will prime initially to 40 psi, but then it drops within a minute or less with the pump continually cyclying. The pressure switch goes on and off. Then the pump loses prime. The water sounds like gurrgling when it does run. Thanks for any help!