I don't have my manual handy but your carbs probably need a minimal rebuild. I'm guessing that the fuel valves are either stuck or sticky or are damaged. The 72 models have this little ball int he fuel valve that falls off and therefore you are probably flooding when you are starting hot and because the fuel keeps running then you are burning mroe than it should. I was having a hard time starting until I replaced mine but now I can turn the key without even touching the gas and it starts.

parts.mbz.org has the rebuild kits ze-28k for $35 per carb.

Doing this rebuild is easy and does not require that the carbs even be taken off the car. You will have to remove the top two sections but the rest of the carb can stay mounted.

Anyway if you into it I can give more info based on my recent experience rebuilding.

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MB 72 250 M130.923 114.011 170k The Beauty