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post #5 of Old 03-18-2010
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First, you need to see if there is an infection...

Originally Posted by kittie View Post
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? 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.

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