Report "I have a briggs and stratton 21 inch 6.75 rearbag lawnmower. I poured feul into it last week not realising that it was full of water. After it not starting I drained the bad feul out and cleaned the spark plug off. I finally got it going but ever since then it runs for roughly 5 minutes than stalls. I have to let it sit or prime it to get it going again but it still stalls after a few minutes of use"