hard hot starts?

If you determine it is fuel related, start simple. What is the fuel line from the mechanical pump made of? Is it resting on any part of the engine? When I first got my Duster a few years ago, the aluminum line from the fuel pump was routed in the stock location, but was resting on the intake manifold. After I turned the car off hot, the fuel in the line would boil, and vapor lock the system. I eventually bent the line where is was not touching anything, and insulated it, and it resolved the issue.