Best thing is to open up the element & examine the black stuff. If its like crumbly rubber, its bugs.
There is a better antimicrobial than fuel doctor. A Penrite product that comes in a black metal can. Normally they have it at supercrap.
Once you get rid of bugs out of your tank, best get only good fuel & dont leave it sitting in the tank for months at a time.
Bugs in diesel will make a mess of your fuel system. Very expensive repair.
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