Fuel tank venting??

Sure nuff 71 evidently did not (yet) use a carbon can. Bear in mind these systems changed every darn year almost. The fuel caps are especially a zoo of "differences" Diagram out of the 71 FSM

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Mine is set up like that except I don’t have the four tubes on one side, just on tube in the front of the tank but it follows from there up the same as this diagram. I’m just trying to use a different crankcase cleaner since I’m not using the other lines off of the cleaner any more. Only one I couldn’t figure out what to do with was the fuel line.