I am not a long time Benz owner so I don't quite know my way around this engine, (1977 450SEL) however I was able to begin converting it to run partialy on water roughly 25%.
When I try an push more HHO gas into the manifold the engine runs rich which is a problem. What I need is a way to Lean out the fuel as I increase the HHO fuel and preferably do it automaticly by tricking the oxygen sensor maybe? or possibly a fuel regulator?? I don't know much about how to do that any ideas, thanks!

If I get this thing working 100% on HHO (disassociated water gas aka browns gas) then I will me happy to give this technology away to anyone who wants it free of charge as long as you agree to teach others for free aswell.

Mahalo from hawaii

Water Fuel Guy