Basically boiled gas... caused by gas line passing next to a manifold ( exhaust system) or hot surface and airlock the line..
Vapor lock is when the fuel gets hot enough that vapor pressure exceeds the fuel line pressure and the fuel vaporizes. The fuel pump doesn't pump vapor very well and therefor liquid fuel doesn't reach the carburetor or remain liquid in the fuel bowls. Car won't start due to extremely lean conditions.
Vapor lock is when a fluid in a closed system, such as in a hydrolic system, gets get hot enough to boil and produce vapor which unlike a fluid can be cimpressed thus rendering hydrolic systems inoperative. Fluids act as a solid when pressure is exerted on to them but in their gaseous state (vapor) they can be compressed and the pressure needed to move pistons is instead absorbed by the gas rather than applied to the pistons.
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