Date registered: Dec 2008
Vehicle: MB 300SE -90, > 500 000 km
Location: Oulu, Finland
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I drove my 300SE for months and months without that tube attached to the FPR. Did not notice any issues performance- or MPG-wise.
Then I finally bought a new rubber insert (there was actually no difference to the old one I had; probably just gotten loose somehow !) and found out that with reasonable effort, I was not able to get it into the orifice of the FPR (while everything in place in the engine compartment). The lazy man's solution was then to invert the rubber insert, cut the other end enough to fit in the vacuum tube and stick it in (went way easier). That's the way it has been ever since...
W 126 300SE -90 anthrazite grey, > 565 000 km +
W 123 200D -84 classic white, > 595 000 km
(W 140 S320 -95, blue black, > 330 000 km, wife's)