I am going through this right now... just bought a 66 and I have gas fumes in the interior... not good! When I open the trunk... whew... fumes-o-rama!
So, I have deduced a couple things... my vent tube is old and needs to be replaced and my tank is equally as old... so I am going to replace that as well. There are many places to buy a tank... JC Whitney, eBay, Crites, Auto Parts Warehouse (just Google Fairlane Fuel Tank) and you will find plenty out there for around 200 bucks.
btw... the gas tank just bolts into the trunk floor, so in theory, it should not be that big of a deal to do the swap.
I am going to replace (if I can find) the following:
- gas tank
- vent line
- possibly... sending unit
- and if I can ever figure out how to do it... fuel line from the gas tank to the carb.
I will let you know how it goes.
Eric