WOW i asked this question in another post this is amazing and what i thought would be the case.
you might find the black sludge is a diesel bug it might be worth treating your tank to a fuel additive
I hear a brand called fuel keen is good but i have never used it I have used chemtech diesel power you can buy it from any repco store at around $15 a bottle 250ml
Hope that helps you a bit
Cheers
Brendon
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