I sure you nice folks can help. A couple of day ago I noticed that my well pump started cycling a lot, so I looked at the pressure-it would drop to about 40psi and kick on the pump. pressure would come up quickly-within a few seconds, then shut off at about 70psi then drop back down to about 40 within about a minute. I suspected a leak so I shut off the valve after the tank and still the drop in pressure. I have determined that I losing pressure on the pump side. doing some reading I have assumed it is some sort of check valve or sifter valve. im not sure where these are located to check them. I have a red jacket 1/2hp submersed pump. thank-you very much for the help.