Originally Posted by
jlisenbe
Net, check your wiring around the switch carefully to be sure there are no breaks in the insulation that could arc to the metal frame of the switch. If the grey cover is on the switch, you should not be seeing a spark when the switch points close. That sounds strange.
As long as the little tube going to the switch is even halfway open, the switch will work. It only needs pressure, not volume.
I had a breaker throwing one time. Replaced the buried cable (the old one was plainly nicked up) and problem went away for a while. Then, we began having the same problem. A little trouble shooting isolated the problem to the wire going down the well to the pump. It was just a small area, the size of nail head, that had lost insulation, but that was enough. It would arc against the metal casing. The wiring was old, so that didn't help. That's why I'm really suspicious of your electrical cable. In fact, if you have enough slack, I'd cut back the cable a foot or so and go with wire which hasn't been pulled and bent so much coming into and out of the switch.