In researching biocides to deal with my diesel/WVO fungus problem, I came across this 'humbug' test kit for determining the presence of fungus in fuel. It could be useful fo those of us having black guck in the fuel issues.

http://www.hammondscos.com/fuel/humbug.html

I'm going to get one and test my fuel. I'll report results here.

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Never a dull moment at Berry Hill Farm.