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vapour lock

noun
1.
a stoppage in a pipe carrying a liquid caused by a bubble of gas, esp such a stoppage caused by vaporization of the petrol in the pipe feeding the carburettor of an internal-combustion engine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for vapour lock

partial or complete interruption of the fuel flow in an internal-combustion engine, caused by the formation of vapour or bubbles of gas in the fuel-feeding system. Vapour forms because of fuel boiling in the fuel lines, usually as a result of excessive heating of the engine in hot weather or operation of the vehicle in areas of high altitude, which lowers the boiling point of the fuel. In some engines the fuel line may be routed too close to the exhaust manifold or other parts of the engine which give off intense heat. Allowing the engine to cool usually enables the vapour to recondense and thereby clears the vapour lock.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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