Have a 1/2 HP convertible two pipe jet pump deep well application. 90'. Pressure set for 20-40. Pump won't build pressure past 23 psi and won't push water into bladder tank. 18 psi air pressure in bladder tank without water or water pressure in tank. Pump has trouble priming but eventually does and builds to only 23 psi even with discharge valve on pump closed. If I bleed off air pressure in tank to zero I can get water to flow into tank but still doesn't build water pressure past 23 psi. Ejector and foot valve are new. Water level is ~13' below surface in 6" well casing so I believe I have enough water. Pump has been rebuilt but still won't build pressure. New pump was installed with same result. System seems to hold pressure if I manually shut off pump. No check valves installed between footvalve and pump that would hold in pressure. Would a pin hole leak in suction line cause this or would it have to be bigger? I've pulled the pipes (plastic) from down the well and didn't see any leaks there. Could I be leaking at the well head connections even though I don't see any water or hear any running back down the well? Well head is 50+ year old. Piping is faily new, 10 years. Pipes from well head to pump are underground about 12' run. Does it look like I'm gonna be digging?