Thanks everyone for the help here. A few issues;

100% Biodiesel (of ANY type) is not compatible with original Mercedes fuel line (Buna-N or Nitrile) or any of the Mcparts fuel lines either (they are usually Bune-N or a nitrile compound. Biodiesel will make "goo" out of it.

I would really like to hear from people who've actually done this changeover and ARE using 100% Biodiesel. Need to find sources (other than McMaster & Carr) for Viton lines (which IS compatible with Biodiesel)

The issue is not a "fuel injection" or pressure issue at all. Also, fuel line is not compatible with oil service (like using it for tranny cooler line will decompose it, ANY of the common fuel lines, whether high pressure or not).

So the same generally goes for diesel (being, well.., an oil).

The problem is finding lines that will handle 100% biodiesel. So my original question.....????

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1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


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"If you don't know where you are going, any road will get you there". Lewis Carrol