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Tartan 37
5,442 Posts
You can have a test done, and/or have the tank scrubbed and the fuel filtered. See what folks have used in your area, something like Dr. Fuel Clean - The Cure for Diesel Engines

Prices can vary greatly, so shop around.

A often highly suggested stabilizer is by Valvtect. VALVTECT BioGuard Plus 6 Fuel Microbiocide | West Marine

Mainesail just did a great write in another thread about tank condensation, his test showed no water in the tank. Bacteria is another story. My boat sat for two years, I had the fuel removed and the tank cleaned, glad I did
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