You don't give us much to go on to help you. I don't know what brand of engine. I don't know what size engine. I don't know if it was under load or just idling. I don't know if it was hot or cold. I don't the engine model numbers. I don't know if you checked anything after it died. I don't know what you did to revive it. I don't know how to answer your questions. To get answers you are going to have to paint a picture of what is going on to the best of your ability. We were not there when it happened nor can we see what you are talking about. The tech guys on this forum are extremely busy this time of year, (most of us are working 9+ hours a day) and unless we can see what people are talking about, we're not going to waste our time trying to figure out how the answer, just ignor.