My wife's Focus 1.8tdci 2003 has oil leaking from the union with the pipe on top of the vacuum pump. I have replaced the O ring but no change. I taped PTFE tape round the thread and the top of the pipe flange which solved it for a bit but now there's a leak again.
I am thinking of just getting a new pipe but was really wondering, if it's a vacuum pump should there be oil in there to leak out? Or is something internal in the pump shot and I need a new pump?