Does anyone know what the function of this bicycle-bell-shaped object is on top of the injection pump? It appears that there is a place to connect something like a vacuum hose... should I be worried that there is no connection at present? Look for red arrow in photo below. Thank you for your help!

Kurt

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Wow, a 4-banger pump, how cute!

Anyway, on my 603 that part with arrow pointing to it is the ALDA. If your car is not a turbo that would be for enrichment due to altitude. If your car is a turbo it also handles enrichment for boost pressure.

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Cheers!
Scott McPhee

1987 300D

That's just a vent to atmosphere it should just have a loose piece of vacuum line running under the dash.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

^ Kinda, that is normal, just open, no line attached. It's an altitude compensator, you have a non turbo engine, so it simply reads the local atmospheric pressure.
The vent is from the side of the VCV to the cabin.

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83 SD

84 CD

Thanks for setting my mind at ease.

Kurt