Recently, there was a crash
Recently, there was a crash near Basel, switzerland, where VW golf hit and drove over a street signal. The plastic tank was cut open by the rest of the steeltube, setting the car nearly immediately on fire, one person not wearing a belt could -with severe head injuries- because she flew through the windscreen, pull out one passenger (with belt) out of the burning car, several others were burned... That's probably why my Opel Astra Build 1994 has a stainless steel tank... Which is about 1 inch higher then the bottom of the car. Point is no diesel car would burn that fast, sorry to tell! That is by the way the reason why nearly non new tank is gasoline driven, although that means that in cold (arctic) aereas, there must be a sophisticated heating system for the diesel.