Auto shop business practices

One of the best days I had while owning my shops was when I had a customer bring his truck in for a noise under hood. Had one of my tech look at it and it needed a water pump. He was out of work at that and needed to save some money, so I printed out the steps for him to do the water pump and sent him on his way. The next day I see him pull in in his wife’s car. He comes in and laughs that he has heard of this but never believed that the shops were being honest, he drove his truck home, pulled it into the garage, struggled through the replacement, fill the system and tries to start his truck. It would not run because the fuel pump refused to run. We towed it in and checked and sure enough had power and ground but the pump would not run. Sometimes stuff does happen