I guess that I was wrong regarding my statement about Pinto gas tanks. They used the "safe" method of being suspended under the car by straps. Here is a picture of the gas tank on a 1977 Pinto wagon: Attachment 510490
That did not help much when, as Freewayflyer referenced,: "Upon impact, the filler neck would tear away from the sheet-metal tank and spill fuel beneath the car. The tank was also easily punctured by bolts protruding from the differential and nearby brackets"