'76 2.0 engine, there is a metal tube projecting out from the driver's side tin in front of #2 cylinder. It looks like an air outlet for some purpose. Does anyone know what it's for?
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Fuel vapor vent system

Thanks Cabinet, should something be hooked up to it? Going where if so?

There are two hoses coming from the charcoal canister on top of the fuel tank.
They come down the drivers side outer long and up into the engine bay, drivers side near the firewall. From there they change to fiber wrapped hoses, one of which plugs into the fan to push air into the tank, the other connects to the air cleaner to suck in the vapors.

I only have one big tube coming off my gas tank vapor canister, no other connection on it not being used. Could that be why there is no tube connected to the pipe on the engine bay tin?
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They weren't used in mid year 74 and later.

Thank you, that explains nothing attached to that pipe fitting, and thats how it should be.

Lots of misinformation in this thread. See this diagram for what that port attaches to.

The 75/76 914 moved the charcoal canister to the engine compartment. There should be a plastic line that runs from the fuel overflow tank in the front trunk all the way back to the engine compartment. It terminates by the battery. The charcoal canister is mounted to the battery hold down bolt with the end with the small line facing forward. The big line on the front end goes to the fan shroud (the empty fitting you see) and the rear fitting goes to the air cleaner. When the car is running, the air blowing through the charcoal canister pulls the vapor out and sends it into the air cleaner to be burned in the engine.

Hook it back up. The weight is negligible, it does not rob any horsepower, and it both keeps the gas smell down and helps the environment.

My charcoal canister is like you said, hooked to the battery hold down. The big rubber tube next to the firewall goes to the fan shroud right next to it below. The big tube on the other end (back of car side) goes to the air cleaner. The short metal tube not hooked up to anything that I'm concerned about is on the driver's side, but post above said 76 did not use it.
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Would you happen to have the same diagram but for a 71 1.7? Semper Fi!

This is for the 1970-71 1.7L cars. Found here: http://bowlsby.net/914/Classic/TechNotebook.htm