I have a Zenith 2 carburetor that seems to flood very easily when you are are starting a warm or semi-warm engine that has been sitting for an hour.(Cold starting is fine.)Carb was rebuilt several years ago and this was not a problem initially.When warm, the engine is very reluctant to start and if it doesn't catch in the first 3 or 4 seconds of cranking, there will be a fair bit of gas dribbling out the throat of the carb.Then, the only way to start the car will be to hold the gas pedal to the floor and crank.It will then always start.I am assuming that the problem is carb related.What could be causing this?I believe that my starting technique is OK.
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