[Darren69]

It sounds like you have hydraulic locked the engine by filling it wilth fuel. If it didnt fire you'll have been lucky to not have done any damage, if it did then it probably would have wrecked the engine. My guess is the fuel ckeaner washed the dirt down to the float valve causing it to stick open. Drain the oil, fill with fresh and turn over with the plugs out to make sure all the fuel is out. Check the float valves are working ok.