This week I was having problems with water pressure. I replaced the pressure switch, gauge and bladder tank after finding that the tank wasn't holding any pressure. After replacing all of that I am still having trouble with water pressure decreasing after the water is on for about fifteen seconds or so. It starts out great but slowly decreases. The pressure switch is set at 40/70 and the tank is pressurized at 38. The water pipe to the tank is longer than the previous one. Would that have anything to do with the decreased pressure? Should the pressure switch and/or tank be adjusted? Before the initial problems with pressure, the water pressure was great, I'm not sure what happened when the tank and pressure switch were replaced. Any help would be appreciated.