There are two vacuum lines coming off the vacuum can behind the passenger headlight. One of them is larger and goes to the throttle body. One is smaller and branches into a "V". One side of the "v" goes to a plastic fitting underneath the throttle body. I cannot figure out where the other one is supposed to go? I replaced all the vacuum lines when I did my top end gaskets and can't find the home for this one.

It an 87 TPI 305, thanks!

Dave

 

On my car the port under the throttle body feeds the egr system.

Here is what my car does with the charcoal canister. The big one goes to the gas tank meeting a pipe by the frame on the passenger side. The smaller one on top goes to the throttle body as you described. The one by itself vents into the fender well. Hope this helps.