Let me try and explain it a different way and you tell me if you are confused or perhaps mis- reading.
RVP is the vapor pressure of the gasoline when the temperature is 100 degrees F. If gasoline has a RVP of 14.7 The same as the air around us it would boil at 100 degrees in a open bucket. If we change the RVP of the gas or increasing elevation and reduce atmospheric pressure we can change the boiling point of the gas. The closer we get a liquid to its boiling point the better it vaporizes. Such as a dish of water. If we sit it on the counter at room temperature it will turn to a vapor and evaporate. But if we heat the water it will evaporate faster. The RVP of the water stayed the same we just messed with the temperture.
In the winter we want RVP high so the gas will vaporize in cooler temperatures because a engine will not run on liquid gas; it has to be vapors. As the air temperature rises in the summer we lower the RVP to try and keep the gas in the tank long enough that we can use it but mostly to prevent pollution from evaporating gasoline. Yes some of it will evaporate but the lower we bring the RVP the less of it will. The pressure in your gas tank is proof of this. Some of the gas is vaporizing in the tank from the heat (closer to the boiling point) and is building pressure in the tank. The same thing happens to a 5 gallon can set in the sun.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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