What is the smoke stack looking thing behind the rear seat? It is about 5 inches wide by 9 inches tall by about 1 inch thick. It is held in place by a strap. I can't see under the car where it come out anywhere but it looks like it does. There is a cap on top that doesn't look like it comes off. It has a bunch of coating painted around it. At least it does in my car. (72)
thanks.

Rear window defroster?? Just a guess

Bubba

I belive that is a vent, not for ac or anything but for fumes from the tank.

Just a vent. I've got one too. It's under/behind the rear seat

your emission lines run to it. I am restoring a 71 now and the tank vent lines and the charcoal canister line runs to it.

Any pics of this avaiable? My 72 Chevelle has two oval openings in floorboard just above the pumkin. I think my old 70 Nova had these too but a rubber patch hung over it on the inside.

Its a fuel vapor seperator for the fuel tank vent system. The service manual and the assembly manual both have pics and explainations of what it does.

Pg. 401 of the '72 Assembly Manual........ Seperator Asm (Fisher Body Installed).

I've got the same thing on my 71 Chevelle, been thinking of eliminating it. I'll be putting a rear sump in the tank and can also close up the corner tubes for the vent thingy at the same time. A vented gas cap should work fine I bet. The factory deal sure is a weird looking setup, why the heck did they design it like that? Bob

Any pics of this avaiable?

Here's the one in my car...

http://www.gigem.com/images/classique/newseatpan.JPG

Great,
Thanks

Hey!! Rear seat pan. I've been there and done that!

Here's the one in my car...

http://www.gigem.com/images/classique/newseatpan.JPG

Gigem, you should always apply primer before any seamsealers. rust will run under seamsealer like a rabid dog once it starts. If you prime the metal with an epoxy or metal etch primer the sealer adhesion will be ten times better and the primer offers protection should the sealer ever fail. Just trying to help you out. Bob