You'll probably find the fuel is wood chips, tip some in the bunker that hasn' got a spout.

Where in the h*ll do I apply fuel? Starting to piss me off that I cant apply fuel to it

I agree with JASMAZ, it is very frustrating to see a mod, but due to no description or a foreign language you have no idea what it is for, so you do not bother to download it and so you lose out on some good mods.

WHAT DOES IT DO? ALL YOU FOREIGNER'S UPLOAD MODS STRANGE LANGUAGE'S AND NOT ENGLISH!

either use it for fuel for the saw mill or sell them at the wood chip sell point