[COE Dan]

I had to add a thermal spacer (I think I got mine from Dick Spadaro) between my carb and manifold on my '39 as the fuel in the carb bowl would boil when I shut the engine down. I could hear the bubbling and the increase in pressure would force the expanding fuel out through the idle jets. As the engine cooled down, the fuel would stop boiling but this would leave the carb bowl near empty and I could see fuel pooling on top of the throttle plates. This would cause problems starting (low fuel bowl supply and flooded cylinders).

The spacer eliminated this problem and minimized carb-related vaopr lock but I still have vapor lock issues in the lines/pump. When able, I use non-ethanol fuel. The ethanol in the fuel has a lower boiling point than gasoline is likely a contributor to this boiling fuel phenomenon.

Dan