C3 Fuel Tank Vent?
Thread Starter
2nd Gear
Joined: Apr 2004
Posts: 2
Likes: 0
From: long beach MS
C3 Fuel Tank Vent?
Please tell me how gas fumes vent from a C3 fuel tank. I have a 1968 and when I recently removed the gas cap, to fill the tank, an unbelievable geyser of fuel shot into the air! Will a new gas cap fix the problem? Thank you.
Team Owner
Joined: Jun 2001
Posts: 23,375
Likes: 1,067
From: Virginia USA
I'm not sure if '68's had vented gas caps or sealed. On my '71 my tank is sealed and the tank is vented through a line that runs up the drivers side frame rail to a charcoal canister behind the left wheel well (Evaporative Emission Control system ). Then there is a vac hose from the can to the carb. Might want to find someone with a '68 to confirm what vent system is on a '68 as '68's are a little different and I don't know when the government mandated a closed fuel system. The EEC system was one of the first pollution control systems. If you have a copy of your owners manual it might talk about emission control devices on your car and the AIM would have it as well.
Safety Car
Joined: Sep 2013
Posts: 4,355
Likes: 2,633
From: Draper Utah
68 and 69 are vented through the gas cap and do not have a charcoal canister.
70's have a sealed tank and vent through a valve on the left side of the fuel tank and do not have a charcoal canister. They vent to the atmosphere (except CA cars which had a canister).
71 and later have a sealed tank and vent through a charcoal canister.
I have no clue if a new gas cap will solve your spraying gas issue, but that's where I'd start.
70's have a sealed tank and vent through a valve on the left side of the fuel tank and do not have a charcoal canister. They vent to the atmosphere (except CA cars which had a canister).
71 and later have a sealed tank and vent through a charcoal canister.
I have no clue if a new gas cap will solve your spraying gas issue, but that's where I'd start.
Last edited by Iceaxe; Mar 10, 2019 at 06:15 PM.
