BMW Questions? Ask a BMW Repair Expert for Answers.
Sorry, the backend server was down all night, so I just got your reply now.
From the picture you sent me, you are trying to disassemble the vacuum pump. Do not take this apart.
The high pressure pump is the shiny cylinder with the torx screws holding it in from the top. It has feed lines for fuel attaching to it as well.
This is the only part that should be replaced/ swapped over. The part you are trying to disassemble is the vacuum pump, and would not be your issue.