I have just purchased a house that is on city water but has a well on the property. I installed a used Goulds VJ07 3/4 horse pump with new Sta-rite foot valve kit(I used jet 4SD and venturi J32P-24). The well is bored to 45 feet and has 26 feet of water in the well. I ran the foot valve to 40 foot deep. I installed new pipe, New pressure switch, new pressure tank( set to air pressure of 28 psi). I ran the water to a yard no frost hydrant 6 feet from the well casing. The pump is set up on 220 volt. I powered up the well and checked the pressure gauge. It topped out at 30 psi. The pressure switch is a 30-50 pressure switch. I tried to drop the switch to cut out at 30 psi which moved the cut in at 12 psi. The pump continully lost prime when the pump cut in and sucked air in from the hydrant and the pump lost prime. I ordered a complete rebuild kit for the pump and descaled the housings. I installed the parts today and hoped for the best. After the full rebuild I am only building 30 psi still and the losing prime problem is still there. The only thing left that is old is the pressure regulator and electrical motor. I have pulled all my hair out and still have not fixed my problem. Can someone help?