Make a polish with a gallon pickle jar and an electric pump. Run an input tube in about 2/3 of the way down in the jar and the dis charge side about an inch from the top. Solder the pipes to the lid ( jb weld will most likely work). Biocide the holding tank and turn on the pump. Let the pump run all day and night. Clean the sediment jar as necessary. A 10 psi pump is perfect, you just want to circulate the fuel in the tank and let impurities settle out. It may take 2 or 3 days but it will polish out the fuel.
Just sitting here and thinking about it, you could take a piece of 4" pvc say 16 inchs long and put a clean out on the bottom with the inlet ind outlet on a cap on the top, mount it vertical under the hood of a truck that is having contaminate problems and fine the fuel as you drive. It would make quite a pre filter settling bowl.
Does any body know of any big rigs that use big settling bowls? That wouldn't be a bad addition to any of our trucks.
I understand the principle of a settling tank, but I'm not sure it would work with my particular strain of bacteria. Mine is like contact cement. Squeeze a little between your fingers, and you almost need your other hand to separate the fingers.
I first killed it using biobor. That left me with lots and lots of glue-like dead algae. Adding massive amounts of Diesel Kleen and other chemical dissolved some of it into the fuel.
But it was still there, and suspended into the fuel. I thought the filters would catch it, but it slipped through 10 microns, twice, and locked up the IP and injectors.
Perhaps a sub-micron filter would work. I'm building a filter assembly now, that uses two tightly packed rolls of toilet paper as filtering elements. The fuel has to go through both rolls longitudinally. There is no bypass.