Date registered: May 2007
Vehicle: 2003 Mercedes Benz E500
Location: San Francisco Bay Area
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Quoted: 1 Post(s)
works against a pin on the reverse of the front carb lever as I recall. The "cup" may well be a lip seal for the accelerator pump piston; it is rather difficult to tell from your description. [They were not blue in my day.]
Remove the cir-clip and throttle plate linkage on the front carb and take the lever off, you should be able to see the pin on the reverse, unless the peening has come loose and the pin has fallen out. You may also be able to check this out by "feel" or of the top section of the front carb is removed, by looking down the backside of the lever. If the pin is loose, I used to fix them by silver soldering the pin in place. [with the lever removed from the carb, of course...] Also, sometimes the carbs are repaired/re-built via cannibalizing old units, and I have seen front carbs fitted with rear unit levers, minus the pin...
Yes, it is not unusual to have a few bits and pieces left over, as most kits cover a range of Zenith units.
The carbs can be frustrating at times, but can be made to work; it just requires time and patience.