Engineer speaking here.
Further to Flying Stone's post re injectors, hot starts are quite easy once you know the technique (always worked for me in Africa with warm engines and OATs approaching 40 C).
Mixture - Cut-off.
Prime (Continental) or
boost pump (Lycoming) until you have a steady fuel pressure reading. Pump off.
Throttle wide open.
Start! Be ready to retard the throttle and advance the mixture when the engine fires.
A result every time!