Here's another thought for you amateur thermodynamicists out there. Suppose
you put a "T" in your fuel line right before the carb inlet and ran a bleed
line back to your fuel tank. You would probably need a slight restriction in
this line to maintain a sufficient pressure at the carb inlet. The idea here
would be to keep the fuel moving in the line, so that it can't heat up too
much. Cooler fuel entereing the carb probably wouldn't hurt, either. The fuel
in the tanks would serve as a heat sink. It probably would warm the tanks, but
it would certainly help when you were suddenly stuck in traffic on a hot day.
Perhaps add a solenoid valve to turn the return path on and off as needed?
Stu
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