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The problem is that gasoline isn't a homogeneous compound. It's got a bunch of different alkenes and alkanes and various hydrocarbons all mixed together. Each one of those different compounds has a diffferent vapor pressure. Some will volatilize at cooler temps, and others at higher temps. No matter how cold it is (in real world situations), some of the liquid will become vapor, so there's no defined point where it 'happens'. It's just that, the warmer it is, the faster it happens. Keeping the system under pressure helps counter the effect, but I can't tell you how much for sure. 36psi is about 2.5atm (above the ambient atmospheric pressure of ~1), so I'd guess that the fuel under pressure is more resistant to vaporization by a factor of about 3.5 <--- WAGNER.
The problem is that gasoline isn't a homogeneous compound. It's got a bunch of different alkenes and alkanes and various hydrocarbons all mixed together. Each one of those different compounds has a diffferent vapor pressure. Some will volatilize at cooler temps, and others at higher temps.
No matter how cold it is (in real world situations), some of the liquid will become vapor, so there's no defined point where it 'happens'. It's just that, the warmer it is, the faster it happens. Keeping the system under pressure helps counter the effect, but I can't tell you how much for sure. 36psi is about 2.5atm (above the ambient atmospheric pressure of ~1), so I'd guess that the fuel under pressure is more resistant to vaporization by a factor of about 3.5 <--- WAGNER.
