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WEATHERING of gasoline occurs in fuel tanks, carbureter float-bowls and vacuum tanks of automotive equipment, the extent being dependent upon conditions of temperature and pressure. If there is sufficient fuel loss due to weathering, the vapor-locking tendency of the gasoline is reduced. Experiments were made in laboratory equipment to determine the amount of loss and the decrease in vapor-locking tendency of a number of gasolines under various conditions. The factors varied were temperature, pressure, time and the size of opening to the gasoline container. In general it was found that there is very little loss until the vapor pressure of the gas-free gasoline exceeds the external pressure. When the vapor pressure of the gasoline exceeds the external pressure, loss occurs until the vapor pressure becomes equal to the external pressure if sufficient time is allowed for the vapors to escape through the opening.