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Old 03-17-2010
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Question diesel fuel turning black

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?
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Old 03-17-2010
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Absolutely. Get a diesel treatment to stop the growth, but if the tank is already gunked up, you will still need to clean the tank and polish the fuel.
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Do what Rich says, or look up his posts what he's told others!
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Old 03-17-2010
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It would help if you stated what type of Diesel engine. Some engines can transfer high pressure engine oil to the fuel system in some type of injectors.
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Old 03-18-2010
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First, you need to see if there is an infection...

Quote:
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?
...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.
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