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In my experience black specs have always been bacterial growth. It is commonly found in fuel. Water causes it to grow. No water, no bacteria. Using biocide has always worked for me. Its available at serious truck repair supply places, and at farm and marine supply places.
Automotive diesel is a lot different than the bunker fuel burned in large marine diesels. Our little diesels would not run on that stuff at all, I don't think.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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