I’ve been restoring a 190SL for an owner and part of the task involves rebuilding it’s non standard DCOE carbs. A lot of W121’s were fitted with these over years to get around the problems thrown up by the awful Solex side draft carbs originally fitted.
As can be seen in the left photo the chokes have signs of water from the fuel supply.Carb on the right after stripping ,wet blasting and rebuilding.
Below is how the original fuel pipe looked before restoration .
Below the original pipe after replating the pipe and ferules with the ends resoldered back in place.
Temporary mock up of the rear carb in place.