Sliced

The first gas pump appeared in 1885. Today, the United States has over 117,000 gas stations--pumping nearly 400 million gallons of gasoline. But how safe are gas stations, and the tankers that deliver gasoline? What technology is in place to prevent a spill ... that could lead to a deadly explosion? John's going to get to the bottom of this explosive mystery--by slicing open a gas station pump, a dispenser nozzle, and a fully loaded gasoline tanker.