I have a cottage water system that draws water from the lake with a jet pump. It's fairly new, it came with the place, once pressure is built up and the switch kicks off and faucets are open water pressure is good on the cold side but terrible on the hot side. However, once the pressure bleeds off the pump kicks in, but the water pressure at the faucets dwindles down and the psi goes down to zero, pump still runs but no pressure and no water. If I turn the taps off then the pump, count 2 potatoes turn it back on and the pump gets pressure immediately and the pump kicks off. Turn the water on again and 1 minute later the cycle starts all over again pressure dwindles off down to nothing turn pump off and the pump gets the pressure back. I have a new 30/50 switch installed there aren't any leaks, that I know of, whats causing the pump pressure to dwindle down to nothing. the pressure switch cuts off before 50 psi as well. When a toilet flushes, fills and is flushed again immediately all pressure is lost. There's a 9.2 gallon power fist pressure tank, there aren't any leaks and the tank is at 28-29 psi. I'm thinking its sucking air that's why pressure is lost. Why would hot water pressure be so low.

Ok, I just bought a new house, it has well water and I'm new to all this pressure tank and submersiable pump stuff. I just replaced the pump because the old one died. I noticed at the well head that when the water was running the pump would cycle very quickly, it would reach 50 psi turn off then lower to 30 psi and turn back on in a matter of seconds. I had a 20 gallon pressure tank installed and now it cycles up to 50 and back down to 30 in about 4 mins. I'm not really sure if that is typically or not? I used a tire air pressure gauge on the pressure tank and it shows it is at 28 PSI which is 2 PSI below 30 so it should be correct right? When no water is running the PSI stays at just below 40 PSI, does this mean my pump is constantly running? If so how can I fix this?