[Leo]

Also keep in mind that fuel injection systems have two things on their side in the anti-vapor battle:

1. A pressure regulating system that uses a return line (rather than dead-heading against a regulator) that is constantly flowing fuel through the system so vapor is minimized or carried back to the tank.

2. The higher pressure itself. Same thought as the radiator cap; I believe that for each pound of pressure, the boiling temp of water is raised 3 degrees. I'm sure there is a factor for fuel, and the higher pressure (like 30 to 40 psi) also helps raise the boiling point of the fuel.

I wonder if there is a fuel system that incorporates a regulator downstream of the carb with a return line to the tank. Hmmmm

Great info on the 'power valve' issue and the heat shield ideas. I'm fearing a carb less and less...