HI, I've a '99 Passat TDI and recently when I went to fill up the fuel tank I found the Flap Covering the Fuel filler Cap was stuck on lock even though I has pressed the flap release button (beside handbrake). Ended up driving home on reserve and found out where the fuel flap actuator was located and manually removed it to release flap so I could fill up. I suspected a blown fuse but on inspection all fuses are ok, so next I suspected the Actuator, which is like a motorised plunger which attaches to an arm which locks the flap . Got a brand new one from dealer (he described as central locking boot actuator), but made no difference since replacing.
Has anyone else had this problem or can suggest something else to check to try and fix. Any help or advice much appreciated.

Thanks