Why not the standard solenoid everyone else uses.....
http://cgi.ebay.co.uk/UNIVERSAL-ELECTRIC-BOOT-RELEASE-DOOR-POPPER-SOLENOID-/390152761902?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5ad6eab22e
Or for just £15 a standard mk.4 fuel flap release actuator?
Chris.
http://cgi.ebay.co.uk/UNIVERSAL-ELECTRIC-BOOT-RELEASE-DOOR-POPPER-SOLENOID-/390152761902?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5ad6eab22e
Or for just £15 a standard mk.4 fuel flap release actuator?
Chris.