[keith6989]

I bought a 55 oldsmobile 5 months ago, and have done alot to it since, i have recently found a large can underneath the drivers side , it is scuba tank size, and has a rubber line that is connected to the carb, i cannot find this in my manual, and there is no opening to put anything in. should this be there? does anyone know what it is used for? anything would be useful.

thanks, robert