A few months ago I had the motor changed on my jet pump. It ran great for a while then the pressure started to get weak. After that It would just randomly loose pressure, one morning I was up getting ready for work and flushed the toilet will the sink was running and lost water pressure. When ever this would happen I would have to go and shut the pump of at the breaker box wait about ten minutes and every thing would be back to normal. I local well company came out and said the pump pressure was to high and turned it down. Now the pump doesn't loose pressure like it did before I just have very weak pressure all the time. This has been going on for a few months and I finally got feed up with loosing all my pressure when ever someone flushed the toilet. I found on line that my cut on should be 2psi above my tanks pre selected pressure which is 38psi. I tried to set the pump to 40psi which is where the web site said to put it. When I did this my pump would not reach the cut out point it would only make it to 45psi. Another thing is there is only a 10psi difference on my cut in and out and I read it should be 20psi. I believe I have a shallow well, With a single line in and out 1/2hp. Also there was a new pressure tank put on and instead of removing the old one they left it and jumped the new on in line. I believe that is all the information I have seen asked for, any help would be great.