What was the outside temperature and the engine temperature when you had this problem? Don't rush into tearing things apart before trying to find the cause. Fuel pressure in the 7 to 8 lb range will push through the needle valve, there is not enough up force on the needle valve from the float to over come that fuel pressure. When this happens fuel spills over the top of the bowl. The temperature of the outside of the fuel storage bowl in the carb, this gives you a good idea of the fuel temperature. When this new fuel gets up in the 120 to 125 range on the bowl it is getting close to boiling and flooding over the bowl in the carb. This usually happens after it is shut down and the temperatures rise. In real hot weather, engine up near the 200 range this can occur in stop and go traffic or at idle. Under these conditions you will usually get poor power in slow moveing traffic and in extreme conditions lose of power below 50 MPH. Above 50 MPH there is enough gas flowing through the carb to prevent boiling. After refueling the cool gas will almost eliminate the problem as long as the fuel is not getting heated on it's voyage from the tank to the carb. G.M.
