Gasoline vapors refer to the fumes or gases that are released when gasoline evaporates. It is the gas form of gasoline that we cannot see but can smell and is highly flammable. Full definition
The amount of gasoline vapor in the fuel line is just strong enough to draw the spider in but not strong enough to kill it. (en.m.wikipedia.org)
The plaintiff in Sean R. v. BMW of North America, LLC alleged that a defective fuel line in the mother's car caused her to breath toxic levels of gasoline vapor while she was pregnant and resulted in the serious disabilities from which the child continues to suffer. (indianainjuryblog.com)
The vehicle's EVAP system is sealed, it's main purpose is to prevent gasoline vapors in the fuel tank from escaping into the atmosphere. (samarins.com)