Leaking fuel pump 350SL

The metal has been a little pressed in. This has to be undone with a flat screwdriver to be able to disassemble the pump in two.
Afterward you will have to give them again a gentle punch to secure the reassembly like on the photo. 

Thanks, it's clear. How did you reassemble that two parts after so that they keep firmly holding? Did you put there some sealant?

Hi Dodi

As written before in my description you'll need three o-rings to seal. One small one for the electrical part (that in your case is leaking) and then one bigger one for reassembling the casing (pressing again the two parts together with the larger O-ring placed and then gently putting down those locking marks to hold everything together. The third O-ring is for the pressure producing part.
You'll discover it just by doing. The only tricky thing is as said: undoing the casing using the reverse hammer fixed on the pumping unit screws (4 of it ) with metal bands with hole of the screw sitze. Place two of the band crosswise and place the puller. Then you just need  a good soldering iron to get the electrical wires inside the pump soldered together again with tin. As described earlier.  
And now: go for it. It's not so difficult. Just make sure you'll don't loose some tiny parts - I tend to use an old ofen - tray. 

Hi,

just a word of warning: Opening those noses by brute force will creat whole housing to loose roundness. Then even a renewed O-ring will not be able to seal again. You need force to open but you also need to ensure that the rest of the housing stays in shape.

Hello Roland and Volker. Thanks a lot for your help. I appreciate it.

Best Regards,
Dodi