Vented Gas Cap
Team Owner
Joined: Sep 2006
Posts: 31,270
Likes: 4,362
From: Westminster Maryland
Hi B.
Originally 71 cars had a sealed gas cap.
The tank had a vapor separator mounted on it's left side (you can see it if you look up pas the muffler.
A hard line ran forward on the driver's side to a vapor canister mounted on the rear side of the wheel well apron.
2 hoses run from the canister to the carb.
If this system is hooked up a sealed cap would be appropriate.
People find that with a sealed cap and operating vapor canister the raw gas smell in the garage is often decreased.
Regards,
Alan
The vapor separator, rubber hoses and hard line:
The canister:
The 2 lines running from the canister to the carb. (There is another small line below the larger hose that can't be seen.)
Originally 71 cars had a sealed gas cap.
The tank had a vapor separator mounted on it's left side (you can see it if you look up pas the muffler.
A hard line ran forward on the driver's side to a vapor canister mounted on the rear side of the wheel well apron.
2 hoses run from the canister to the carb.
If this system is hooked up a sealed cap would be appropriate.
People find that with a sealed cap and operating vapor canister the raw gas smell in the garage is often decreased.
Regards,
Alan
The vapor separator, rubber hoses and hard line:
The canister:
The 2 lines running from the canister to the carb. (There is another small line below the larger hose that can't be seen.)
Last edited by Alan 71; Feb 7, 2015 at 01:12 PM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Alan71 is spot on. But, to clarify a little more...
On the 71, the vapor recovery system was used as the method to vent the tank, also. IF the vapor recovery system is disconnected/plugged-off, a vented fuel cap needs to be installed to allow the tank pressure to equalize.
On the 71, the vapor recovery system was used as the method to vent the tank, also. IF the vapor recovery system is disconnected/plugged-off, a vented fuel cap needs to be installed to allow the tank pressure to equalize.
Thread Starter
Cruising
Joined: Aug 2005
Posts: 10
Likes: 0
Thanks for the replies. My system seems to have the vapor canister hooked up so I'll switch to a non-vented cap to see if that reduces the garage fuel odor. Thanks for the pictures, they were helpful in understanding the system.
Burning Brakes
Joined: Jan 2009
Posts: 766
Likes: 97
From: Lake Norman, NC
Interesting topic/thread. Thanks for posting. Does anyone know a sure-fired way to test the functionality/effectiveness of the system? Not being the original owner, I've often wondered how to tell if my '72's system is compromised in any way. The last thing I want is for the tank to collapse. I keep a vented cap on because of my "phobia".
Thanks.
Thanks.
Team Owner
Joined: Sep 2006
Posts: 31,270
Likes: 4,362
From: Westminster Maryland
Hi rr,
This is the 'diagnostic' info for the "Evaporative Control System" section of the 1971 Emissions Control booklet.
I don't know if this might be of help to you or not.
Member War Bonnet has another emissions control publication that might have some additional info for you. He may see this post or you might pm him.
Regards,
Alan
This is the 'diagnostic' info for the "Evaporative Control System" section of the 1971 Emissions Control booklet.
I don't know if this might be of help to you or not.
Member War Bonnet has another emissions control publication that might have some additional info for you. He may see this post or you might pm him.
Regards,
Alan
