Please post the model and year anytime you ask a question (or if you have one car, put it into a signature line that appears automatically).

Assuming this is a w126 or w123 turbo, the shape of the cigar line is designed to dampen pulses in the return line. In theory it is one factor necessary to ensure a smooth idle.

There is no serious detriment to replacing it with standard fuel hose if the need arises, but given that it's about $11-13 from online suppliers I choose to use the correct part myself.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22