I recently noticed my well pump cycling 30/60 psi every minute or so. I then isolated the output of the pump. The cycling continued. I checked the bladder tank pressure with no load and pump powered off. It had no pressure. I proceeded to pressurize the tank to 28 psi. It has held pressure for several days. Anyway, the pump still cycles with output isolated. I then opened a spiqot upstream of the cutoff valve with the pump powered down and it was creating a suction through the spiqot. Any advice out there. The only thing I can think of is the foot valve letting water go back into the ground. I have a sub-mersible pump at about 180 foot with a bladder tank and pressure switch set at 30/60 psi.