Yep, use a big square shaft screwdriver and an adjustable wrench.  Drive it into the slot with a hammer an twist it open.  Cheaper to replace the $18 cap than pay a locksmith. BTDT.

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of mark drillock
Sent: Wednesday, January 21, 2015 3:34 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Fuel filler cap stuck

Yes, if it is the small key type a stout flat screwdriver can sometimes be used to force it counter-clockwise to open.

Mark

Edward Maglott wrote:
> Can't you use a flat screwdriver or just about anything to unlock some 
> of those caps?
>
> On Wed, Jan 21, 2015 at 6:04 PM, mark drillock <mdrillock@cox.net> wrote:
>
>> While the original 87 gas cap used the same key as the rest of the 
>> locks it is common for the gas cap to have been replaced with a cap 
>> that uses a small key. The replacement cap may look like the original 
>> but still need the small key.
>>
>> Mark
>>
>>