Pulled off the top 2 carb sections - top sections are flat and I replaced the 2 center screws from some older backup zeniths - same length (I have a ton of old Zenith stuff lying around). Tightened a little bit better with the new screws in place.

Floats looked fine but I remeasured float level and replaced one of the needles. While apart I cleaned all the jets, mixing tubes etc. and I'm seeing no obvious problems. I checked the secondary stage diaphragm and replaced the front one - it was leaking down a bit fast for my liking. Mine is a '72 so no venting valves...

I also checked the fuel filter in the tank and the 2 filters in the carburetors - all looked great, even the one in tank was very clean. I have a fuel filter after the mechanical pump and before the carbs but I replaced it not too long ago.

I haven't started it yet because of the fuel in the crankcase - so I need to change the oil.

Bottom line - I still see no obvious reason as to why these carbs are running so rich and dumping fuel.

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE