Quote:
Originally Posted by Bluebell
... A bubble of gas caught between a carb and a gravity feed tank is not vapor lock, its an air lock caused by the run of pipe not having a suitably consistent gradient. I say that because the bubble would run straight up into the tank, and be replaced by more petrol, if the pipe was correct.
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This crosses the line between semantics and chemical terminology. Air is not vapor, and gasoline vapor is not air.