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Old 11-26-2011, 01:31 AM   #15
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Monaco Owners Club
Join Date: Jun 2011
Location: Montana
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I have 2 big Raccor s on my boat
You could actually see the black slime in the bowls at the bottom of the filters
In the coach I changed both primary filters. There was one on each side. The starboard side had the water sensor attachment to it
I didn't see any slime in that one
500 miles later I changed only the port side filter. I'm guessing it is catching all the debris.
For the life of me I couldn't get any biocide in Houston on that weekend and was committed to travel to Austin.
I'm kicking myself now you tell me it was so cheap.

2005 Monaco Signature Castle 1V
2013 Subaru Outback Toad
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Old 11-26-2011, 01:10 PM   #16
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Join Date: Sep 2008
Location: Newark, DE
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It's Not Really Algae

Pardon if this is a trivial point, but in the interest of all of us increasing our knowledge...

Whatever is growing in your diesel tank, it's not algae. Algae requires light to grow, and there's precious little of that in your tank. The gunk that grows there is usually a mixture of fungus and bacteria. While they don't require light, they do require some moisture, and grow most readily at the fuel/water interface.

Thus, I don't trust any product that claims to kill "algae". The better ones are called "biocides", and kill "microorganisms" in the fuel. Probably the worst offender is the sham product called "Algae-X", which is simply a magnet in a casing that it tied into your fuel line.

In an interesting twist, there is some research have luck using certain types of algae to produce diesel fuel. So I guess while you "can't have algae in your diesel", you "can have diesel in your algae"!

Bill Halberstadt

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Old 11-26-2011, 02:15 PM   #17
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Location: Freeport, ME
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Yes Bill you are 100% correct but it is still called an algae in the trucking business. Actually what causes the Black Slime is a fungi that can live in the hydrocarbon fuel if water is present to start it. You can also call it a microbial life. It is still easier to refer to it as algae or the Black Slime

Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
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