Is the gunk just dirt or is it mold (On edit -- algae is the correct word I believe). Diesel holds water and if enough water is there, there is a border between the diesel and water that[algae] mold just loves to grow in. This stuff is tough to kill; will clog injectors, fuel filters, and does damage to the fuel system that is NOT covered by warrantees. In my flying days we used to add a product called 'prist' to jet fuel to keep this stuff from growing -- I've not seen a similar product for diesel but have definitely witnessed the after affects of not having such available.
Bottom line: If you can't kill the stuff 100%, pitch the fuel can and get a new one -- no matter what the cost. just my .02.......
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