Aren't there three 13mm bolts? And be carefull, the plastic tends to get
brittle as it ages.

Alistair

>Per,
>
>You don't need to unscrew the big castle nut.  The filler neck goes through
>a rubber sleeve into the tank, and will separate easily.  You only need to
>undo the two 13mm bolts under the tank.
>
>Karl Wolz