My well pump is set to kick on at 40psi and off at 60. It kicks off at 60psi and doesn't do anything until it drops to 40, say 4 or 5 flushes of the toilet or a long shower, but when it drops to 40 it doesn't stay on until it gets back up to 60, it goes on for about 3 seconds and then shuts of for 20, then the cycle repeats until 60psi is reached, when it shuts off for good.

My tank, when dry, has 37psi in it. I don't know what could be causing this problem. It just started this morning when my wife was in the shower. It was fine last night for two loads of laundry and one baby bath.

I haven't got the foggiest idea. Any advice would be greatly appreciated.