Was it pretty loud before it refused to start? These pumps do go eventually, the first on in my ITB Golf sounded like a model airplane taking off. But it turned out it was just int he process of ceasing its berings. The new one I hear pressure up every time I turn the key and you can feel it vibrate. So if your getting power to the pump and its not presurizing I would have to say yes its the pump. If you are going to bench test it you can do so quickly dry but dont run it for more then a few seconds that way or you could cause bearing damage.