If so, it sounds to me like the next thing to check is the pressure switch. If it is adjusted incorrectly the pump will keep running as it is trying to reach a pressure to high for the pump to achieve.
Do like Bill said and google the instructions for the d square ( I believe) switch. It is not that difficult to properly adjust. If you read the instructions multiple times you should be able to do it. I think there are also some good YouTube videos on how to do it.
