Fill a gallon bucket with tap water. If you do not have tap water due to installing the well pump, use store bought water.
Pour the water into the discharge hole in the pump housing or into the automatic regulator mounted onto the discharge of the pump. Fill until water pours out of the hole.
Adjust the pressure regulator to the maximum pressure setting. Wait until the pressure gauge starts to read a buildup in water pressure.
Open the regulator slowly to force the pump to discharge water. Continue to open the regulator until the pump's noise changes or the flow of water decreases. Close the regulator until the pump returns to its normal sound. This is the correct pressure to maintain the proper prime on the pump.