Harry,
  You didn't say whether things were loose at the top end of the
filler and at the expansion tank or at the gas tank itself.
   Loose/deteriorated lines at the plastic tank above the wheel  can
perhaps be repaired by splicing in some new line, but you will
probably have to drop the tank to replace it properly as it is
probably getting too old.  The main filler pipe vent is a larger
diameter hard plastic tube which runs parallel to the filler and is
quite durable.  Its end plugs into a grommet on the top of the tank.
  Any hose you use needs to be rated at least for low pressure fuel.
No need for high pressure fuel injection hose on this side of the fuel
pump.
  Very likely you can look forward to dropping the tank, a challenging
job, especially the first time.  Ask questions if the procedure is not
clear.  Our on-line vendors have kits of hoses and grommets.

good luck,
Larry A.

On Sat, Dec 11, 2010 at 9:35 PM, Harry Hoffman
<hhoffman@ip-solutions.net> wrote:
> Hi All,
>
> So, I was filling the tank today when all of the sudden I noticed gas
> spilling out from underneath the filler neck.
>
> I had a peek down there and it seems like the vent lines from the fuel
> expansion tank and the filler pipe are just kind of hanging loose :-(
>
> Are the lines the same hose as the standard fuel injection hose? The
> bentley doesn't seem to specify it.
>
> This is for a '89 GL Wolfsberg.
>
> Cheers,
> Harry
>