thinking of purchasing exmark metro 48 for a flip model number is M15KA483P serial is 659241 engine is kawi fh430v15kai. Current owner states mower runs but is having fuel spit out from air filter. Says he put a new carb on it and fuel pump. To me sounds like a float bowl issue but kinda weird if new carb. possibly gas tank cap vent? He wants 550$ for mower and is fairly clean machine belts look ok and newer tires..anybody have any other ideas? Possibly known issue on this kawi? Not sure if he has messed with any carb settings.