Reply to "gas overflowing from vent line after filling"

The reality of the situation in the Pantera, IF you fill the tank to the top AND top it off to the top of the filler neck, the tank "vent" is below that fluid level.

Not only will it leak fuel through the hose to the charcoal canister, IF the fasteners that hold it to the tank are not perfectly tight, it will leak through there as well.

In it's first few years, the car had a reputation for gas fires involving the gas tank.

That is as much for the spilling of fuel on the hot exhausts inside of the engine compartment, but also little incidentals like the vent.


The "check valve-roll over" design was not introduced for the US versions as far as I know. It is something that came along later and was added by many then current owners.


The best solution is not to fill the tank to the top. Stay down about an inch below the vent AND if you decide to update it and change it over to the "anti-roll over design", whatever you do, make sure that the fasteners that you use are solid and not hollow like pop rivets are.

The most ridiculous thing I ever found were the hollow stem pop-rivets that Hall supplied as fasteners for the vent. Those would have turned the tank into a sprinkler head if it was turned upside down with fuel in the tank.

If you use a vented gas cap, you don't need the vent. It would not be a terrible idea to take the thing out and put a solid plug over the hole.