[thirty3]

I'm pretty convinced there is a bowden cable in case of such a situation.

It will be located behind the trim in the boot/trunk of the car obviously directly behind the filler flap.

And if your solenoid has gone you would have to go there anyway...lol

e.g

http://www.justanswer.com/uk-car/1h9tt-replace-fuel-filler-flap-mk5-golf.html