https://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Old_Mobilgas_pump_in_Snyder%2C_TX_IMG_4598.JPG/640px-Old_Mobilgas_pump_in_Snyder%2C_TX_IMG_4598.JPG
When buying gas was
caveat emptor, they would pump the gas up to eye level so you could inspect the quantity, color and impurities; and then it gravity fed into your car.
These are on eBay as collectibles. Buy low and sell high when you're done.