My central locking on my 1997 vw golf just stopped working it sounded like it was trying to work but now does nothing. also the gas tank cover wont open as its stuck on lock...any advice on what i can try?

The gas flap is operated with the central locking,stand at rear of car with tailgate open,just inside to the right,under the floormat you will find the central locking pump.but first renew the batteries in the remotes then unlock the car with the key and hold the key over for 30 secs, the windows may go down,
then lock the car with the key and hold over for 30 secs,the windows may go up and the sunroof,if fitted will close,then unlock with remote button held down for 30 secs,this will reset alarm/central locking.
if you need to get to gas flap, pull carpet away in boot behind flap area and pull wire to unlock....