I have a ride on B&S 14.5 HP engine. I think I put in some bad gas with water in it and finally go it started. I went to start it again and it didn't seem to kick over. I took off the hose and let all the gas come out and tried to put new gas in. I am having trouble starting it again. In addition, I put in new gas it seems to just come leak out now? I open the spark plug and the gas comes pouring out? What did I do? Any help?