Thanks
@mulberryworks for your insights. I think we are on the same page. Either the float was hung up due to debris that resettled into a new home or a few passage ways where air is provided and were clogged or both. I think the car sitting or being used sparingly is the real issue. The question on my mind besides the obvious float symptoms is to try to learn about the flows of gas and air in and through the carbs (I am completely new to Zeniths). I believe some of those pathways of air from outside at the top of the carbs may be partially blocked. But it's just a theory. I tried to get to each one with a dip of carb cleaner, sewing needles, and q-tips. I removed the 2 jets at the top of each carb and soaked them in carb cleaner. At least 2 were clogged. I kept asking myself: where is all this soot coming from???
In the past, I have seen flooding happen with Holly and Weber carbs. In my experience, in more than a few instances, it was a clogged PVC valve that an overnight bath in gasoline and/or carb cleaner cured. I assume there is NO PCV VALVE on a 1971 3.0CS engine. Please confirm. (FYI......This is a EURO version of the 3.0cs so I am not sure it has much if any emission controls that the USA delivered cars had. But I could be wrong about this as I am new to BMW's of this era).
But I also thought, is there a possible emission control subsystem that may be clogged that would cause such a massive flood? A vent, a valve? Keep in mind the engine was still running and responded by increasing idle speed when the accelerator was depressed. So, I am thinking perhaps wrongly that the issue is a parallel system of gas/air flow that is blocked or narrowed. This subsystem dumped gas in massive quantity. It also seemed to worsen as the engine heat increased. That's when I noticed the problem and dripping gasoline everywhere. THE CAR WAS STILL RUNNING. I have never seen that before.....