Dog, I would be very careful putting any additives in your tank. Most will clog your racor filters with dead microbes. I would look for a mobile fuel polishing system to go to your boat and polish your fuel. From then on only use Valvtech diesel from local marinas; they already have special additives to prevent most algea and sludge build-up in your tank. Most diesel start to breakdown 120 days after refining! Keep your tanks full. avoids water in your tanks and then use the boat as often as you can. Most problems with fuel comes from boat sitting up for extended periods. If that boat hasn't been used in 2 years get rid of the fuel in those tanks!
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