WUR fuel leak

[Benz124s]

Hi Everyone,
I'm trying to figure out a fuel leak on my 76 450 SL. It's leaking from the vacuum connector on the warm up regulator when the fuel pump is energized. I went through and cleaned the WUR replacing the seals as I put it back together. I followed the instructions on a video a guy posted but it still leaks fuel. Any thoughts? I've taken it apart a second time to confirm nothing was missed but it appears OK.

[daantjie]

The leak can only be from the fuel cell inside the WUR as the pressure is controlled by the pin working against spring pressure. Likely the o ring in the fuel cell has perished and thus it's leaking from between the 2 sections held together by 4 screws.

[Benz124s]

I'll take it apart and recheck that O ring. The rebuild kit came with one but maybe it's not the correct size. Thank you for the reply!