An old Mercedes tech told me the cigar hose dampens pulses to protect the metal fuel return line under the car, which could fatigue over time from the pulses. True or not? I am not sure.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked