Another tip I posted a few years ago that I will refresh is the mounting of the pump. These things will really resonate through the car if you don't isolate them from the structure of the car. Go down to the local Pep Boys or other auto center and get some of the muffler hangers that have the thick strips of rubber attached to them. Cut the hangers off and use the rubber to bolt to the car, then bolt the pump to the other end of the rubber. You've effectively isolated the brrrrrrr of the pump and life will be easier.