I think I found the cause of my problems...

Algae.

I pulled the tank strainer and it was clean.

I put a bucket under the tank drain and poured about a gallon of diesel into the filler. A bunch of flakey stuff came out.

It looks like fish flake food. I brought a sample down to a local diesel place and they think it's algae.

The clear inline filter was getting lots of gunk fast. Only 2 weeks and a new inline filter had almost clogged.

This all started a couple weeks after starting my WVO experiments. I guess the tiny bit of water that remained in my oil storage & mixing drums was enough to allow algae to grow. I had to wash out the drums I was using.

What I don't understand is that water should drop to the very bottom of the tank and drums. If I pump oil from above the bottom, should that prevent any water & algae from getting into my vehicle tank?

Also, the vehicle tank pumps off the bottom, would not any water in the car's tank get burned as soon as the car is started? Thus removing any water from the fuel and preventing algae growth?

Can Algae grow in veggie oil? Or grow only in water?

The local diesel shop sold me some stuff called BIOBORE. Any one heard of this stuff? Any good for algae control? Kinda pricey, $20 for 16oz. But one ounce treats 40 gallons.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5