First, you need to see if there is an infection...
Originally Posted by kittie
Our diesel (red) fuel is turning black, have set up filters as a mini polishing system, and have cleaned the racor filter head, replaced the filters. Any suggestions ... could this be algae?
...by running a culture. It's easy.
Sail Delmarva: Diesel and Biocides
Once you have an answer, chose a biocide. You may also need to clean the tank. The polishing filters will try, but cleaning is far better, to make a fresh start.
(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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