No vent on any gas cap after 1974 in the USA. System has charcoal cannister to vent the tank system.
The fuel guage is part of the instrument cluster (computer).
There are 2 sending units in the tank, connected in series. The guage averages those readings.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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