Update on Vapor Lock and Changes made with Gas Cap/Sig difference in the 2 caps

[Aerocraft]

HOWEVER,, by not allowing fuel to run out of the tank, it can cause a ?Stall?..maybe not the vapor lock but problems?[/QUOTE]

The slight vacuum in the tank when it is not vented will prevent the gas from draining to the carb and the fuel mixture will become very lean, acting quite similar to what happens when the fuel boils in the carb. Gar Williams