vapour lock

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vapour lock

n
(General Engineering) 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
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Noun1.vapour 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)
blockage, stoppage, occlusion, closure, block, stop - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"