vapor lock

vapor lock

noun
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.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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WordNet
vapor lock

noun
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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