Put a bathhouse on our property on a lake. Drove sand point 18' with 10' of water in the pipe. 3/4 horse pump with pressure tank close by. Primed and can pull water strong to 35PSI but stops building pressure. Motor will continue to run unless I turn the pressure switch down below 35PSI. The pump is set up to run 110 or 240. Right now we have it set to 110, could that be the problem. Should we wire to 240V and will that solve the problem. We also plan to pound down another 5'. Thanks for the help.