Okay I am trying to figure out where the middle hose from the charcoal canistor goes on an obd2 b18b1. This is coming from an original obd1 civic canistor. I already have the other two hoses connected one to the fuel hard line and another to the evap purge solenoid on top of the intake manifold. The third one I currently have plugged with a screw, since I don't know where it goes. I don't feel any vacuum coming from it, but wondering right now if it has something to do with my bad gas mileage.