vapor lock

an obstruction to the flow of fuel to a gasoline engine, caused by the formation of bubbles in the gasoline as a result of overheating. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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vapor lock

a stoppage in a pipeline caused by gas bubbles (especially a stoppage that develops in hot weather in an internal-combustion engine when fuel in the gas line boils and forms bubbles that block the flow of gasoline to the carburetor) 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
If the vehicle is losing power, has a rough-running engine or will not start,
  it may be experiencing vapor lock.
Vapor lock, engine or transmission overheating, or radiator boil over can all
  be caused by long steady ascents.
In addition, when the weather is hot, suction pumps are subject to vapor lock.
It also indicates the tendency for vapor lock in the engine.
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