[RalphG]

I recall my dad talking about vapor lock occasionally on the 52 Merc when it was his daily driver in the 1960s. Maybe today's gas is less subject to it but in the 4 years I have had the Merc back in service it has never vapor locked. Came close one hot August day leaving a car show but it turned out to be a leak at the sediment bowl gasket on the pump. Tightened it up and it has been fine since. (But I do carry a new gasket in the glove compartment).