fule odor

Vehicle Information: Model: 911T; Year: 1969; Body Type: Targa; Engine (type, size, modifications): 2.2L; Total Mileage: 85,000;

Ed,Every time I fill my tank all the way, gas starts flowing up through the vent hose and leaking all over the inside of the bonnet.I've checked the hoses, they're old, but not cracked, and checked the connection and all seems to be fine. I don't think it's a matter of the gas cap not venting properly since the overflow occurs even when the cap is not screwedd on. The only possible problem I can think of is that there is no charcoal cannister, which I believe was stock when the car was manufactured? I'm at my wits end...the fumes are overwhelming immediately after fill-up to the point where it's making me nauseous.Is the charcoal cannister necessary?Where can I get a diagram of how the vent hoses are suppoosed to look?thanks in advance.