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Old 04-18-2014, 09:23 AM   #1
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Default Black goo in diesel fuel treatment

When you see black goo being trapped by your diesel fuel filter or crack a fuel line to bleed your diesel engine and see more goo, what do you do?

I assume it is either microbes or asphaltane in the fuel. I am using a duel, spin on filter system before it gets to the engine fuel filter so not big issue to keep changing that first fuel filter, but would like preclude the continuation of the black goo formation so can eventually get it all filtered out of the fuel.

I am assume there are additive than can be used to kill microbes or treat asphaltane. Does anyone have any experience with this? Thanks
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Old 04-18-2014, 09:54 AM   #2
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My filters are always black after a few thousand miles BUTno goo or anything other than the filter changing colors from a dull tan to black. There are additives to kill the fungus at wallmart. I never saw a discolered fuel when draining the filter yours could be water possibly or dirty fuel if its got consitancy to the stuff.
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Old 04-18-2014, 11:24 AM   #3
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Quote:
Originally Posted by fighterpilot View Post
When you see black goo being trapped by your diesel fuel filter or crack a fuel line to bleed your diesel engine and see more goo, what do you do?

I assume it is either microbes or asphaltane in the fuel. I am using a duel, spin on filter system before it gets to the engine fuel filter so not big issue to keep changing that first fuel filter, but would like preclude the continuation of the black goo formation so can eventually get it all filtered out of the fuel.

I am assume there are additive than can be used to kill microbes or treat asphaltane. Does anyone have any experience with this? Thanks

Most likely algae. It lives in the water and feeds on the fuel. You will need to treat the fuel first to kill it. The only problem, once it is dead, the debris is still in the fuel tank.

Most of the marine stores will sell a biocide. Biobor is one brand, Starbrite has one that they market, and a couple of others.

Once you treat the fuel, you need to get rid of the water in the fuel tank. If you have a way to drain the tank, great, but most boats don't have a tank drain.

I made a home made fuel polishing system when I had a similar problem on my 36. It consists of an electric fuel pump and a Racor 1000 fuel filter with vacuum gauge.

I connect the line from the tank to the system, and the return the back to the tank. I let it run for eight hours on each tank. My pump is a Walbro, and pumps about 50 gal/hour with no restriction.

Eight hours seemed to be enough if my tanks were about half full (150 gal).

The other option would be to hire someone to polish the fuel for you. I had it done on my 43 before I bought it. The previous owner paid for it as a result of the survey. I think the cost was about $1000.00.

Even though the ValveTech fuel is supposed to have a biocide in it, I still add some to the fuel at each fill up.

Blaine
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