In 1940, Pontiac introduced the Torpedo on the General Motors C-body. Along with Oldsmobile The new C-body that the 1940 Pontiac Torpedo shared with Cadillac Series 62, Buick Roadmaster The door locks had weather sealed keyholes. Gas filler tubes were enclosed under "flip-up" lids on the...Fuel tanks on cars today are made from plastic, molded to fit into very tight spaces on the cars. Often, the tank may be shaped to fit around pieces of the car body or frame. This means that when the float reaches the halfway point on the tank, there may be more or less than half of the fuel left in the tank, depending on its shape.