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I have a feeling the fuel you got is not good. It will be hard to remove the fuel but this is an option. Go to the local parts store and get a bottle of heet and octane booster. The heet will get rid of any water that was in the fuel. The octane booster will increase the octane in the bad fuel you have. This should clear up your issue if not than I suspect there is a problem with the float adjustment on the carb for the generator.