Patti,
  'Pick' the latch with something small enough to fit in the little hole,
bent to turn the latch, but strong enough to rotate the little latch assy
without breaking or bending back  Maybe a large paper clip bent to do the
job would work. It only needs to go a small amount to release the lid.
Alternately, you can open the entire cover/ lid assy by removing the 2
screws, prying the larger cover open, thenusiing a little screwdriver or
something to rotate the latch.  The long-term fix is to buy the key, which
is sold by Bus Depot.  I did.
HTH,
Mike B.

----- Original Message -----
From: "PB" <pbrattan@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Thursday, May 17, 2007 5:46 PM
Subject: Water tank refill key?

>I don't know if I want to use the water tank, but it seems that I can't
>open
> the water refill cap without a key.  Where would I get one, or is there
> another "trick" to opening it.
>
> Patti
> '90 Westy automatic
>