I had a dieseling issue. G63B weber carb. I added a fuel pressure regulator, rebuilt the carb and redid the timing that seems to have fixed it. I leave it sit for more than 7 day pretty regular and it doesn't like to start.
I spray some starter fluid in the carb (belt dressing will work) and once it kicks over it draws gas from the tank and refills the bowl & runs. Usually it starts right up one press of the gas peddle to the floor and turn the key. I haven't decided to do more yet since I don't drive it a lot. I keep it around to haul stuff and as a project.