I have al 2050 I picked up to restore, tractor was missing fenders and front headlights, and was not taken care of. When I brought it home I had to use starting flued to start it, runs good once started. I have fixed the oil leak from pto, changed fuel filter, air filter , changed all oils and filters, new water pump and fan, it sits in a warm shop. Battery is good. Spins over real good. I pulled all glow plugs out and tested each one. The only thing I don't have experance on is the mechanical shut off. Is it possable it broken in side? Or a fuel pump problem? Need help at this point, Thanks Randy