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Old 20-03-2019, 15:00   #16
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Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 3,499
Re: How to clean a baffled alum fuel tank?

I posted this in the past. A proper additive and circulation thru a Racor like filter will slowly clean your tank. The additive will dissolve the crud over time and the filter will catch it. If you have engines that pump and return large amounts of fuel, you don't need the circulation pump. With a vacuum gauge at or after the filter, you can see if the filter is becoming clogged.
My current boat has 1942 steel tanks. There were no access ports and the boat sat for 6 years before I bought it. With 3x the additive and 6 year old fuel, I idled the mains until I felt confident the boat would be reliable to the fuel dock. Then I added 3x additive to the new fuel and did a 40 mile sea test. Each fueling I use a 1x additive and in 2 years, when I finally tore out the galley to get to the tanks, cut ports, and entered, the tanks were clean. Only fuel, no water, no crud.
I used Algae-x, and now I use Archoil AR6200 that I think is better.
Today's diesel is crap. It doesn't burn as hot, absorbs water and tends to separate when sitting for long periods. Additives in the fuel added at the refinery only last a short time. You really need to use an additive every fueling for clean tanks.
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