Gas Sending Unit Tubes- 2 Questions

[Zonaman]

My Gas sending unit has quit on me. The gauge goes up when disconnected and drops to E when connected. A float perhaps? In the event I need to change the entire unit I noticed that my '69 has a two-tube unit on it looks like either a vent or some kind of return. I though that was only on the '72? Will it make a difference if I use the two tube as it is now or should it be a single line setup?

Thanks.

[54blackhornet]

One line should connect to the charcoal canister behind the battery/passenger side fender area. Definitely replacement with same type.

[Wrenchbender Ret]

The 72 had the charcoal cannister. Some models had a vent tube that went up in a loop & down through the floor. Some models, particularly A/C models, had a return hose to the fuel pump. Like Hornet said. Get the right one for your model.

[Zonaman]

Okay, got under there and here's the rest of the story (see photo) the extra line is just blocked off. Possibly a previous owner was anticipating a return line for a future fuel injection setup?