I have a 1/2 hp 115v submersible well pump that is 4 years old. It started tripping the 35 year old 15a breaker last week. It used to buzz occasionally so i figured it was time to replace it . I also replaced the pressure switch because it sparked upon startup and the contacts looked a bit fried.That did not fix it for long.The symptoms were: the breaker would trip occasionally;the pressure switch would turn the pump on and the pump would run for 10 seconds before stopping, then after 40 seconds turn itself on, then run for 10, off for 40 and so on until the pressure was reached then the switch would turn off the pump. After much discussion with many people it was decided that my pressure tank was bad. When i replaced the pressure tank i replaced it with a larger one: a precharged 82 gallon. The old tank had so much corrosion at the inlet it was reduced to about 1/4" also the check valve before the tank was so corroded that it would not function. I replaced the tank, the switch, the pressure gauge,the check valve and lots of plumbing and some valves.I have a 30/50 switch and i set the pressure tank at 28psi.as instructed in the manual. It worked well for a day. I called tech support for the pump and got suggestions for testing the pump.I am getting 122v at the line side of the presure switch,108v while running.I must note that for some reason i do not have a control box. I did an insulation resistance test at the pressure switch and got 400,000 ohms. I did a winding resistance test at the pressure switch and got .9 ohms. Both apparantly within acceptable limits. however when I did an amp test on the hot(black) wire while the pump was running, it read that it was drawing 31 amps. That would explain the breaker. I have a mole problem as well. I am quickly running out of money and cannot afford to replace another component that won't fix it.any help would be greatly appreciated. thank you.