Once again, even this thread has progressed predicatably towards manaufacturer bashing regarding "why didn't they mandate a fix" to a known problem.
I say again that you can only mandate against a rule/regulation and that is the repsonsibility of the regulator to interpret, not the manufacturer. And regarding the rules, they are written mostly for operation in the air and not after the aircraft is parked.
The history has numerous incidents of fuel leaks in the air and thankfuly the regulations of the design make it unlikely that they will progress to a catastrophe (leak harmelssly, overboard, no ignition sources, fire detection/suppression etc.)
History has also shown that the greatest problem is fuel pooling with the aircraft parked on the ground (with running engines to stir it up), but as I said before it takes a large leak to pool fuel to this extent.
After seeing the photo, I 'm sure that the regulators will find something to fix other than just maintenance issues.