When I shut the truck off, power steering fluid blows out of the vent hole in the top of the cap. I just recently had the reservoir off to drill out a snapped bolt, so I'm pretty sure that had something to do with it. Is there supposed to be an O-ring on the high pressure fitting where it threads into the pump? There wasn't one when I removed the hose, but it wasn't leaking before. I didn't see it inside the port, either.