Don't forget it's been raining on and off up there all week so the tyre wall would've been full of water as well (I've certainly copped a shower from tyres walls in the past).
One theory being discussed on FB is a passing car exhaust flame may well have ignited the fuel as the V8's have thier exhaust exiting on the left side of the car which is the side facing the fuel spill in this case.
THe planned upgrade the the Car of the Future will see the fuel cell move forward of the rear axle line hopefully eliminating this issue, or at least reducing it as the dry break fitting will likely still be at the rear and possibly damaged in a big hit.
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