First guess would be a bad inertia switch, next thing to do is check every fuse assuming your description is right. Because if you are SURE that you have power on the 12 volt leg of the relay you can pop the cover off of the relay and see if the relay clicks when you turn the key to the on position. If it does that you have power, you have ground and you have signal at least up to the fuse box. If the relay clicks and sends fuel to the rail the injectors should spray unless the rail is completely clogged. Or you could be out of gas...