Let's consider some factors that could be causing you to prime your pump so often: 1. Every two days, your water use is greater, causing the water level in the well to drop enough for the pump to pull in air, either through the intake, or through a very small break in the pipe. When the water is low enough, the break is exposed to air and you lose pressure. 2. The suction pipe has a loose connection. 3. The rotary shaft seal is worn on the pump. 4. The air volume control valve on the pressure tank sticks from time to time, allowing air into the pump chamber. Your best bet is to contact a certified well driller, experienced in pump repair, to inspect your system and pinpoint the problem.