The pumps do not run off of a battery. Perry makes the vp 30 which runs off of crankcase pressure from the engine. and they make the vp 20 which simply operates off of engine vibration. With the vp 20 you just mount it from the engine backplate and hook the fuel lines to it and that is it. Very easy to hook up. With the vp 30 you have to drill and tap the backplate for a pressure fitting, which is not that big of deal either. Both work well and I think they are the same price, if I remember correctly.