Sounds like a fuel treatment thread brewing.
Although it doesn't really look like bugs, it could be. If it happened fast, it is likely.
Sail Delmarva: Diesel and Biocides
If it were me, I would always design a diesel tank so that it could be cleaned. Treatments are good for maintenance, but a clean start is best, even after the bugs are dead.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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