hooking up a charcoal canister. I have questions.

[josh86k10]

Hey guys, I appologize for asking a toyota question here, but the yota tech forum I found sucks compared to CK5. And it's a general question for any motor I assume.

I ditched all of the 1977 yota emissions garbage leaving 3 items needing vacuum:

1) carb to distributor for vacuum advance
2) PCV to manifold vacuum
3) Charcoal canister - which is where my question lies

The charcoal canister originally went to some sort of switch that got vacuum from 2 sources, one of which got vacuum from like 5-6 sources and was fed by a smog pump which is no longer there, blah, blah, blah, you can see where this is going. I think all of this was an elaborate scheme to prevent vacuum from going to the charcoal canister (tank vent) until the engine was warm. Well, now most of this crap is gone (and was inoperable before).

I want to just hook up the charcoal canister in order to properly vent the tank. Would it hurt anything to just hook it up directly to manifold vacuum and bypass the switch, cuz I don't have a clue what the vacuum switch needs in order to function right (it has 3 vacuum ports on it and a wire). Apparently vacuum diagrams for a 1977 toyota don't exist anymore.

 

[josh86k10]

So apparently hooking it up directly to manifold vacuum will create the equivalent of a vacuum leak, so that's a no-go. Should I just eliminate it altogether and route a vent line somewhere near the tank itself with a piece of fuel line? Or how about routing the line from the charcoal canister to the air filter so the engine can suck the fumes through the carb? The canister has 2 lines, one to the tank vent and one to some form of vacuum (which was switched somehow). I just don't want to have fumes accumulating inappropriately and blow up or something (over-dramatic, I know).

 

[Jason4x4]

just leave the tank line going to the canister, and don't hook anything else up to it. I "think" it should be fine. that way it will still vent the tank.

 

[pauly383]

If the carb has a bowl vent it can go to the can too , then fumes can go back to the tank . Cap off the vacuum part .

Think like a early 70's truck or Chevelle , one line to can from carb , one line to tank from can .