Okay.. I have a John Deere 240.. I just replaced the motor with a Briggs and Stratton 18.5 hp. Come to find out the new motor doesn't have any kind of fuel pump and relys on a gravity feed. So I bought a low volume , low oressure fuel pump and installed it.. The mower ran great for about 20 minutes. Then I am assuming I overloaded the carb with too much gas volume.. THe mower backfired.. and smoked a ton and quit.. Now I can't get the new motor to start.. ANY IDEAS.. on what my problem may be..
BRad

Did you check your oil level before running the new engine? Also, did it come with a new carb.