Looks like the fuel return valve. There are many posts here on Zenith carbs. Perform a search in the Vintage Mercedes forum.
https://www.youtube.com/watch?v=7-bMXv_N-Vg&feature=youtu.be
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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor
Last edited by 865sp300e; 11-02-2015 at 05:51 PM.
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