In a message dated 4/21/2011 3:13:23 P.M. Eastern Daylight Time,
jhecht@ALUM.MIT.EDU writes:

I'm  guessing the cap may have to be drilled out altogether, and I'll have
to
get a new one.  Does anyone know if it is possible to replace a gas  cap?
I'm sending this email directly to a few folks who I think might know  more
about replacement parts than some folks, but if anyone knows, please  let me
know!  I will phone my mechanic soon, but thought I'd rather  start by
finding out whether anyone has ever had to replace a gas tank cap,  and
what's involved.

Might I be able to get one from a parted-out  van?  (Chris, do you know?
You
often seem to have parts.)   How much of it would I have to replace, in
order
to end up with a gas cap  lock that works?  Might I be able to replace it
with some other cap,  even if it doesn't lock?  Ron, I didn't see this as
something Bus  Depot sells - do you know whether it's possible to replace
them?   Frank, have you come across them?  Or anyone  else???

did u squirt a bunch of liquid wrench in the keyhole?   try that  and
WD-40.   spray the heck out of it...and shoot it into the  keyhole..let it soak
for a day...  then try it..
if that fails then just stick a BFS (Big Freakin Screwdriver) in there and
turn.