I have a John Deere ride on mower, model 0115A. I was using the mower in November, and it quit running. I tried restarting it and it would run for maybe 20 seconds then die. Now it won't even start at all, I just hear the starter motor trying to start the engine but it wont fire up. My knowledge is limited. I replaced the spark plug, fuel filter and Air filter. I see fuel in the fuel filter so im guessing no blockage, at least to that section. When I try to start the mower it just turns over but wont start the engine, the battery then dies from trying to crank the engine. Im not sure what else to check. I know nothing about carburetor's or checking circuits etc, just the basics.