This must be very common its just most people do not notice. A word of warning. When you get the tank lose and it will not come down any further. It is held by the breather spigot being close to the chassis. if you pull the tank downwards it is possible to snap it clean off the tank as its plastic. Ask me how I know that.
If there is nothing obvious holding it up you will need to get over the top of the tank to release the breather pipe. It will be very difficult to see. In fact I didnt and Im usually careful.
|