Land rover Discovery 3 2007 stuck fuel filler flap

SOURCE: Petrol filler flap stuck in locked position

As a temporary solution you can normally force it open use something like a credit card (or credit card size piece of stiff plastic)

This forces it open without damaging the paintwork.

For a long term solution it will have to be dismantled to be cleaned up and greased etc

SOURCE: Petrol filler flap stuck in locked position

Sounds like the solenoid is defective, but the petrol cap can be opened by opening the boot and putting your hand down the side of the back panel (petrol cap side). You should be able to feel the solenoid and on the back there is a lever that can be pulled out which will release the petrol cap latch.