[Bibio]

unlock the filler cap, undo the three bolts that hold it on (two are false) take off and clean with oily rag. what ever you do dont try and brush it out unless you put a rag in the filler neck. while you are there blow out the breather hose and the overflow/water drain. use a bicycle pump. then if you have some squirt in the holes of the hoses acf-50, this stops the metal spigot rusting.