I have a Cub Cadet 7260, with a Mitsubishi 26 HP 3 cylinder diesel engine. It has never missed a beat. It began being difficult to start last week but once it did start it ran fine and would restart easy the rest of the day. Now it won’t start at all. It turns over strong. Fuel is getting to engine, no air or blockage in line. It is smoking a little more than usual. I’m not sure what to check next. Any advice would be great. Thanks.