IIRC, there were a couple additional issues with the Pinto. There was a problem with the filler tube that connected to the fuel tank (I think it was welded to the body or something), and this could cause a rupture and subsequent conflagration. The fuel tank was much too close to the bumper, and there wasn’t enough of a buffer zone around it; there were lots of structural items nearby that could cause punctures. Ford actually had the option to license a self-sealing “fuel bladder”, a design that came from the aviation industry, but the bean counters nixed that. The doors tended to bind and jam in a collision, trapping occupants in a burning vehicle. And finally, '70s-era Ford was really making some lousy cars, especially small ones. The Pinto is yet another case of “the hard way is the easiest to learn”. (I think there was an episode of Engineering Disasters that covered the Pinto fiasco in great detail).

The diagram you posted below shows what a defective design it really was. It’s almost as if they shoehorned in the fuel tank wherever they could, like it was an afterthought.