Phil, the carbon canister is there to filter the vapours from the gas the fuel tank/system produces from the movement of the fuel through the system and sloshing around the tank. These are usually used on a so called sealed system, not one with an external breather.
MFI 911's had a breather box in the boot area behind the LH bonnet hinge, this was just a hollow separator box that as its name suggests only separates the vapour from the gas. A similar theory to a gully trap. These were not so effective and eventually replaced by carbon canisters later on, when the K-jetronic system was introduced in the US. We did not get them until late SC's and 3.2's
MFI 911's had a breather box in the boot area behind the LH bonnet hinge, this was just a hollow separator box that as its name suggests only separates the vapour from the gas. A similar theory to a gully trap. These were not so effective and eventually replaced by carbon canisters later on, when the K-jetronic system was introduced in the US. We did not get them until late SC's and 3.2's
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