I'm no chemist, and I don't recall much about vapor pressure from high school chemistry, but I've always thought of RVP as the boiling point of gasoline. If atmospheric pressure is 15 psia, and the temperature of the gasoline reaches a temperature where the vapor pressure is 15 psi, then the gasoline will boil. Which is why vapor lock is a problem for fuel lines which are under vacuum and routed near an exhaust pipe. But evaporation will occur at much lower temperature than the boiling point, same as water evaporates at temperatures below 212F.
The thing you have to remember about your sealed fuel container is it is a system in equilibrium: The pressure has risen in the container to the point where no net evaporation can occur. If you raise the temperature, the pressure rises as fuel evaporates, until a new equilibrium is reached. Hence the best thing you can do to keep gasoline fresh is to keep in in a sealed container.
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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