Been having some vapor lock issues and I think one of the charcoal cans is clogged b/c I've replaced everything else. I got one used but opened my hood (87 22r) and realized there are two cans under there. Any idea which one is the tank vent, rear right??? What's the front for?

 

I don't know much about the 22r, but I know that one of the charcoal canisters is for fuel tank vapors, and the other is for fuel bowl/carburetor vapors.

I can't for the life of me figure out how the evap system could have anything to do with vapor lock. (but see the first 7 words of this post.)