Join Date: Feb 2010
Thanked 17 Times in 15 Posts
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Tropic Cat may still be on the right track. Diesel fuel will polymerize as it ages. This makes it burn more slowly and often results in incomplete combustion (basically, the longer the molecular chains the slower a hydrocarbon will burn). Adding some new diesel will help, but if there is enough really old fuel in the tank the soot could be a result of this incomplete combustion of old diesel. Microbial growth in the tank will make things even worse.
I would take a look at a sample of the fuel from the tank and compare it to some fresh diesel. If the difference in clarity is dramatic (as in, one look makes you wonder how the engine ran at all), replacing ALL the fuel and cleaning the tank may be in order.
Never forget them. Do something to prevent it from happening again.
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