Join Date: Jul 2011
Location: Cologne, Germany
normally the plastic vapour tank (#3 in diagram) is behind the flip down carpet in the trunk....never heard of it on the tail light panel! (but maybe Automatic S4 were different...someone?)
here is a nice diagram of the S4 system (from anothr BB member) with key legend (nb. there is also a thin hard plastic tube inside the vapour tank, not clearly shown on original diagram, that needs checking too)
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.