I got a reply back from the seller. He did say that if he knew the pump was bad he would not had sold it to me, and he did say that it was working when he took it off the car. I can only take his word on it. He wants me to open up the pump to verify if the diaphragm is indeed bad. Of course he wanted to make sure that everything else was correct etc..
He does have a rebuild kit he is willing to send me, but he would like me to get back to him with my findings. So that will be my project when I get home tonight.