Here is my WVO fuel station.
Settled, dewatered oil goes in the top 5 gallon bucket which has a
plastic 100 micron strainer that fits over the top lip.
(Strainer shown in front of top bucket)

That drains into larger blue bucket which has 25 micron sock filters in it.
(Sample sock filter shown in front)

Finally, the fuel is drained through a 5 micron sock filter into a 33 gallon barrel.
12V electric fuel pump is used to fill the car.

It has served me well for three years.

Good Luck,
Jeff

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1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end