I have a shallow well at my rental property that is only plumbed to water the lawn/garden. When I turned on the power to the pump this year I noticed that it did not sound as though the pressure tank was filling up like it did last year. Water came out of the spigot with normal pressure when first turned on, however the tank kept running like it was slowly filling up (would not stop). Now there is no water coming out of the spigot? Any ideas as to what might be the problem? Well pump? Pressure tank?