It's an ongoing problem for pretty much all kerosene-fueled aeroplanes.
There's a fungus that grows in the boundary between the fuel and any water in the tanks. On smaller aeroplanes you can use stuff called Prist to help kill it, but it's really nasty stuff.
I suspect that for at least the last decade or so, the fuel companies have been adding something to they fuel to help inhibit the growth of the fungus as I haven't seen Prist used for quite a long time.
I personally refused to go near Prist as it's so dangerous to humans.
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