I have a submersible water well. The little square 'd' pump will not stay on. Ill fiddle with the little 'L' shaped valve sticking out and the pump will kick on. After a few hours I once again will not have water in the house. Ive read about the two screws and adjusting them but unsure if this relates to my problem. I really don't know what the problem is. Also when I go to work at night I pray that it doesn't turn off again because I get a very upset call from my wife. She won't go out to adjust it because it's dark and in the back side of the property (2 acres).. help please

I presume that "The little square 'd' pump" is your pressure switch. Show us a picture.