Thanks Carnage, quite true.
Fuel tank venting is not rare. The reason the vents are out near the wingtip is so that the occasional incident does not result in a fire.
I admit that this one seems to have been a persistent and high flow affair, and if fuel had somehow managed to run down towards the cowling then a response was indicated, but a slug of foam into the internals of a hot engine creates thermal shock as well as corrosion problems.
The vent orifice is designed to run the fuel clear of wing, etc, so I am curious how fuel got on lower wing/cowling.