Taken from: "Gasoline Volatility" by Jim Kerr at the site:
http://www.canadiandriver.com/articles/jk/at_000814.htm
"Vapour lock refers to the situation when the fuel boils in the fuel lines so it cannot be delivered correctly to the engine. When vapour lock occurs, the engine operates as if it was running out of fuel."
That help?....can anyone help me?
Magik?