installing the filter on the bike is tricky, you do have to support the plastic rail when seating the filter into it. It will press in almost all the way by hand then you may need to drive it all the way home with something, I used a socket extension. As long as you support the rail from underneath somehow as you press the filter in, it should be fine. The fitting you pulled out of the petcock just presses back in. Its normal to accidentally pull the whole thing out, they all do that if enough pressure is put on them.