It was like I turned the key off. It will not restart, the engine turns over and it has spark on each plug wire. There is the right amount of oil in the engine, there is gas in the gas tank, engine does not even try to start-but it has good spark. The engine was running super fine before shutting down. the engine is a kawasaki vertical shaft 20 hp V twin K series water cooled, it was hot today.I give it a short shot of starter fluid and it fired up for a split second or 2. So it must be carburetion. engine has 550 hours. Do any of you have any ideas? fuel pump? or shut off valve?