After being without water for the winter my dh finally got the well pump up and runing again. Now he's out of state starting a new job and I'm having trouble with the pump again. Saturday I turned on the generator and I noticed the pump was running for about 20 minutes but there was no water in the pressure tank. I noticed the check valve was very warm...what would cause that? Dh told me to try pounding on the check valve in case something was stuck, then prime the pump and try to run it. I tried this about three times but still no water. The pump sounds like it's running okay. Any ideas?