will not start when hot
 

i have a 2000 golf 2.0. i just had the clutch done and now when the engine is hot and i shut it off it will not restart untill it cools. i put my scanner on it and the only code i get is P0456, evap small leak. from what i have read this should not stop the car from starting. it has been very hot up here in the great notheast is it possiable that i am getting vapor lock? please help!!!!!