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White Knight - vapor lock?

Could a vapor lock explain the temporary disabling of the car, as described on show 1044? The pressure and temperature both fall as you climb, but it takes time for the fuel’s temperature to fall to the ambient temperature.

Presumably, whatever caused the problem is common enough for the mystery man to know of it happening before. Also, from his vantage point above them, he may have known how long the travelers were stranded.