Nissan Repair: the car won`t start when the engine is hot, van diesel, cargo van

Question
I  HAVE  SERENA CARGO VAN  DIESEL STADARD .WHEN I START THE  ENGINE  WHEN THE  ENGINE  IS  COLD IT  START OK. WHEN  I  RUN THE  ENGINE FOR SOME TIME AND GET WARM AND SHOT IT  OFF ,IT WON`T START AGAIN UNLESS IS GET COLD AGAIN.

Answer
Nick,

I need to know more like does the engine crank over but not start or does it not turn over when you attempt to start.  If the engine will crank, but not start I would be looking at the fuel injectors to see if any are leaking and flooding out the engine.  If the engine will not turn over then look at the starter getting heat soaked.