Like I said put a small piece of hose on the hole in the center of the inside of the cap and try to blow through it if you can't blow through it it is not vented or it's plugged. In the amount of time it took you to take the picture you could have checked it, drilled and put it back on your car and waxed a couple ricers. Like I said I just went through this 2 weeks ago. You might want to smell your oil you probably have gas in it from all of the fuel that was being pushed passed the needle and seat in the carb flooding the motor