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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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