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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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