I have read all the posts regarding the pros and cons of these old oven/stoves and am very aware of the dangers, However, I just want to understand how they work. My C30 has a tank which rusted thru and is now gone, but the stove is still there and in pretty good shape. I just can't understand where the "pressure" is developed. How do you refill? Do you just pour liquid alcohol in the tank and charge with compressed air (that can't be)? How else can the alcohol get from the tank to the stove? I feel like and idiot....but please enlighten me. Thx