I keep my 65 country squire stored in a 4 car garage that is open to all the other renters and the property care taker and it looks like the property care takers friend has been taking gas from my wagon since it has fresh gas (other cars have been in there for many years) so its time for a locking cap,I had a hard time finding a new regular cap for it and I think its smaller then the sedans so anyone know where I can get a locking cap for my 65 c/s.
I had the same concerns with my 65 truck, an od ball size so large you could put a fire hose into the tank. I went to my local auto parts store and the next day they had one for me, fairly cheap if I remember..under $20.
the main company is called "STANT"....you should be able to get one from 'almost' any auto parts store http://stant.com/part_locator/index.cfm
What about putting a gas can under the car full of water and sugar, and putting the filler tube directed to it? The old dog might learn to leave well enough alone. Here's the Stant page: http://www.stant.com/index.cfm?location_id=167 Part selector - Looks like you're in luck too: http://stant.com/part_locator/index.cfm
I wish I could do that but the filler neck comes out of the top of the tank,the owners of the property now know what is going on as there is other stuff that is missing too.