Quote: If you block off that nipple you can starve the bowl of fuel.
i checked my center carb this weekend. the line that goes to the fuel bowl vent also goes thru a rectangular port in the center of the metering block and straight to the hole in the front center of the carbs ait horn. so theres a vent there all the time.
I figured that out years ago when I first capped off the vent line on the side. I diidnt want gas to pour out onto a hot manifold if the needle got stuck open.
