Vapor lock occurs on the suction side of a fuel pump. When fuel pumps were mounted on the engine they picked up heat from the engine, in addition the long suction line running to the fuel tank could be heated from the hot road surface or ambient air. As the pump lowered the pressure in the suction line the fuel would flash to vapor (boiling) if the vapor pressure of the fuel exceeded the pressure in the suction line. As a result the pump would pump vapor and no liquid would reach the pump.
This condition can not occur in a gravity feed fuel system. In the event the fuel is heated to the point the vapor pressure exceeds ambient pressure (boiling) the vapor simply bubbles up through the fuel line and exits through the tank vent. Liquid fuel continues to flow to the carb. In my opinion the bubbles in the sediment bowl can considered normal on hot day.
Other than verifying the fuel tank is properly vented I would look else where for the problem. Perhaps a faultly coil or condenser...?
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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