I have a submersible 3/4 HP 240 volt pump that feeds our home. The pressure switch, pressure tank and everything else is in the basement. I have had the pressure switch set to about 38-58 range for years now. Last night I heard the pump running (actually the hum of the line vibration from directly above) which is normal. However, this time it continued to run for quite some time. I think it normally would run around 2-3 minutes to fill. So since it kept running I went down to check it out. What I found was that it was sitting on about 55# of pressure and continuing to run. I watch it for quite a while and it was not moving. It seemed as if the pump did not have the oomph to get it to the shutoff pressure. So for now I dropped my pressure switch down to 30-50 and it seems to be running at that. I have not timed the fill-up period but it seems to me that it is taking longer than it used to. Had I been smart I would have written down how long it took before to have something to compare to. So my question is this. What do you see as possible problems? My thought is that the pump is going bad. I am thinking perhaps the impellers are worn. I believe the pump is 8-9 years old. (Meyer, I believe) Is there a screen on the intake that could perhaps be plugging? The main question I have is whether there could be anything inside the house that would be worth checking prior to pulling the pump? I will add that the pressure holds well once the pump shuts off and we never have the pump kicking in without usage. (that I know of) I had thought of perhaps a problem with a check valve in the house but as I said that does not seem to be an issue. If it is dropping pressure at all sitting idle then it is taking hours to do so or else I would have noticed it. So I am thinking that a pull of the pump is in order. And my gut is telling me that the pump will need replaced. Is there a way of replacing the impellers on the pump or if I find that to be the problem am I simply in for a new pump?