Hi, make sure there are no leaks at the fuel filters. Also there is no fuel lift pump on this tractor, it relies on the fuel pressure from the fuel tank, having a fuel tank that is three quarters full also helps or if you have an air gun and a clean rag you can slightly pressurize the fuel tank.
Bleeding as per manual open bled screw on top of filter closest to fluel tank and let fluel flow until bubble free, close that screw and repeat on filter closest to injection pump. Put Stop/Start/Run lever in Start position and throttle about 1/3 open and then try starting tractor. Crank tractor for 30 seconds and if it does start then loosen one of the injector lines at the rear of the pump and try starting again.
DO NOT Crank starter motor continuously or it could overheat.