From what I can put together, this version of air pump was only used on 1980 and 1981 models in north america? They switched to a different "puslair" system. The pump is belt driven and located beside the alternator and is connected via a number of 1" rubber hoses both supply and delivery as well as several vacuum lines . There are also a couple of control valve looking things, all controlled via the vacuum lines. There is only one vacuum inlet on the weber and about a half a gazillion on the solex which is tired and in need of a rebuild. The Weber sounds much better and seems to be an instant