96 Evinrude 150 hp V6 has one of the carbs leaking gas by the slow speed mixture screw. Only when engine is running. The leakage is enough to run down and onto the other carbs below. I verified that no other carbs are leaking.<br />Questions: What would cause this, of course? Is that an air mixture adjustment? If so, no fuel should be inside that area, right? If there is supposed to be fuel inside, is there some sort of gasket/seak inside that this needle valve screw passes through? Last question: What's needed to fix it?