Startron in the Fuel tank,
Fungus/Algae/"Whatever" GONE!

(I neglected to see if you'd changed both Fuel Filters...)

Anyway...The advantage of Startron is it's enzymatic action that allows
the Dead Algae/Fungus Corpus to pass harmlessly through the Filters
[AND not clog them up].

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'84 300SD sold
124.128