Quote:
Originally Posted by carolinamudwalker
They are adding BUTANE to our gas now to get rid of it. Before the EPA the refineries just burned it off It only causes problems in an open fuel system as in carburetors. ....
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To the extent that butane (C4H10) is being added to gasoline, it's not likely to get rid of vapor lock. On the contrary, it would be added in winter time to INCREASE the volatility (lower boiling point/increase vapor pressure) to help with cold-engine starts. In the summer time, such low molecular weight hydrocarbons will promote vapor lock, and even more so in the presence of ethanol, which tries to drive the more volatile hydrocarbon fractions out of the liquid into the vapor phase.