I run B99 in my 300D and have replaced all my fuel lines with new lines. All the non-return lines I actually did with extra thick and resistant marine diesel lines. Question about the return lines: the NAPA lines I've put on the return seem to be sweating and getting soft after 2-3 tanks of B99. Are the new MB cloth covered return lines I can buy from this site made with synthetic rubber and thus OK with biodiesel? It's hard to find the small diameter lines and I can't find anything here in the forum that answers this question.

Thanks for any help.

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1978 300D