If you are running an engine on Diesel fuel that has algae/ bacteria/ fungus growing in it, and it doesn't just cause the filter to clog entirely, will it result in heavy black smoke emissions?
From my experince when I worked in a truck shop I saw a lot of black fuel when changing FWS's, didnt notice that any of them smoked. for some reason they were usually Volvos with an ISX (not that its related, could be a driver thing).
Worked on a lot of tractors and trucks that I've seen black fuel in, and I've never seen them smoke more that anything else... just plugs the filters up.
