I installed a new jet pump, pressure tank, and check valve on my sand point well this spring in my cabin and everything was working great until about 1 month ago. When we first arrive at the cabin and start using the water the pump will cycle and as it turns on the pressure drops slightly. Normal enough. As the pump cycles on throughout the weekend the pressure drops to zero and there is no water coming out of the faucet for about a minute until I assume the pump gets re-primmed, then there is water again. I thought the check valve had a leak on the well side, and the water was falling back down the well so the pump had to get re-primmed every time it came on. I've tightened the valve but it is still happening. Could I just have a bad check valve and need to install a new one. I have not taken note of the exact PSI that the pump is kicking in at (I assume around 30-35psi, whatever it is set to at the factory) so shouldn't I have a little pressure left after the pump comes on? Instead it drops right to zero until is sucks water again. Someone said the pressure switch could be clogged but does that make sense? Why would the pressure drop to zero?