Re: Diesel Shelf Life

Posted by Gary Schafer on November 01, 2005 at 17:26:31 from (63.135.135.124):

In Reply to: Re: Diesel Shelf Life posted by JK-NY on October 31, 2005 at 17:16:27:

Actually the algae grows at the water / diesel level in the tank. It feeds off the diesel fuel. Water in the tank is caused mostly from condensation. It is generally worse in climates where it is hot and humid in the day and cools at night. The expansion and contraction draws the moister into the tank where it condenses.

Keeping the tank full helps reduce the problem. Boats have a problem with algae constantly. You may not know it is in there until your filters clog up at the most inopportune time.
Adding a biocide kills the algae growth and the dead algae turns to a black slime that gets sucked into the fuel line. Usually the suction line is above the bottom of the tank for that reason. But if the tank gets agitated, as in rough water bouncing the boat around, the dead algae comes off the bottom.
If it gets bad enough the tanks need to be cleaned, usually by cycling the fuel through a pump and filter to clean it. In Florida there are several companies that offer those services. They call it "fuel polishing".

Regards
Gary

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