aglewando

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.

theandies

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.

Iceaxe

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.

BLUE1972

The cap should say vented on it.