I, too, had the same problem with my 216. Vapor lock is not fun. I installed a 6v fuel pump between the gas tank and the mechanical fuel pump. Installed the electrical switch under the dash. I use the electrical pump to fill the carburetor if it has been a while since starting the 216, then turn the electrical pump off before starting the engine. When the 216 starts to stumble because of vapor lock, I turn the 6v pump on. It has worked for me. I've tried other remedies to prevent the vapor lock, to no avail.
Rick
