>> what I am really questioning is just how safe can a plastic tank be in
>> a crash if it can be pierced so easily by a needle or small nail?
You can easily pierce a metal fuel tank with a needle or nail. With a plastic tank I would have expected the object to bounce off the surface of the tank more easily than that of one made from metal.
Talking of piercing, is there any evidence to show that a would be thief did the damage to drain out the diesel? Most modern filler necks have a device fitted to prevent fuel being syphoned, and more often than not making a hole in the tank is not only easier for a thief, but quicker too.
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