What are the scientific issues with this method of dragons breathing fire?

I am including some dragons in the universe I'm building. Now, I have already decided that only baby dragons will fly, but I am having some problems with breathing fire. My current design:

Dragons have lots of symbiotic anaerobic fungi in their alimentary canals. Breathing fire requires a diet heavy in sugar, and as a result, dragons will often make their homes in places with lots of carb-rich food. The symbiotic fungi will break down the sugar, producing alcohol which will be stored in special glands on either side of the end of the dragon's mouth. The dragon's tongue has a small, hard protrusion under its tip. When the dragon must breathe fire, its alcohol glands undergo violent convulsions, ejecting their load with great force. At the same time, the dragon strikes its tongue against one of its teeth, creating a spark that ignites the alcohol. For extended torrents, glands in its mouth secrete an oily, highly flammable solution. The dragon sets this on fire, and then proceeds to shoot a continuous barrage of alcohol. Fire-resistant mucus protects its mouth.

Now, I'm pretty sure there is a problem with the science somewhere. Can somebody help me find it, and/or suggest a better method?

posted over 6 years ago

Budhaditya Ghosh‭

11 reputation 3 1 1 0