I've just been reading stuff on how the thermastart works
and how you should make sure it has clean fuel .Well,, I don't have a thermastart on my 1600 , but I do have a box on the top rear of my engine,the air filter holder and the decompression link are attached. It is part of the air intake system, there is a fill plug and a dip stick on it. What is it and what do I put in it?