No it is NOT true that the key for the tank filler is universal, if you have
the older style filler that uses the separate locking plug under the cover.
The new replacement filler with the cover hinged at the bottom does use a
cheap plastic key.  We do have ways to generate keys for the locking caps,
and have new locking caps also.  There are 125 possible different keys for
the filler, though we've only known the lock manufacturer to use 34 of the
possibilities.  There arre no codes on the locks, but we generate keys on a
nearly daily basis for that application.  Feel free to contact me for
further information.
Steve Sandlin, Registered Locksmith
Steve's Lock Shoppe
'84 Wolfsburg Westy
'79 Transporter
'00 New Beetle

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