Inside the fuel line, fuel vapor may block the flow of liquid gasoline. This is called vapor lock.

在油管中汽油蒸气会阻碍液态汽油的流动，这称为气阻。

youdao

The purpose of the carburetor is to supply and meter the mixture of fuel vapor and air in relation to the speed and load of the engine.

化油器的目的是提供并计量与发动机转速和负荷相应的可燃混合气。

youdao

Fuel vapor that is not condensed as a result of cooling can escape from the chamber through a float needle valve at the top of the chamber.

冷却时未冷凝的燃料蒸汽通过位于腔室顶部的浮动针阀可以从腔室中逸出。

youdao

By 2020 or so, depending on the progress of fuel cell technology, the last of the island's 9, 500 gasoline cars will be gone and only water-vapor-emitting fuel cell autos will remain, according to Taniguchi's plan.

FORBES: Magazine Article

If you oxidize any hydrocarbon, you generally produce heat, carbon dioxide, and water vapor, assuming a relatively pure fuel source.

FORBES: On Romney's 'Rising Oceans', Time To Get A Bigger Boat

If, on the other hand, you were to buy summer gasoline and try to store it until winter, you might find yourself having problems getting the fuel to ignite, due to the lower vapor pressure.

FORBES: Why Spring Means Higher Gasoline Prices