If the black residue is slimey, it's probably algae. Get an algicide product from a marine supply store and treat the fuel per the instructions.
If the residue is gritty you have something called asphaltine (sp?) Here's a link- http://www.thetruckersreport.com/tr...lers/59763-black-stuff-in-fuel-filters-2.html
Post # 20 talks about asphaltenes
black fuel
Discussion in 'Freightliner Forum' started by beagle01, Apr 13, 2013.
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