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I have a 1987 Daimler (xj40). the fuel cap cover doesn't release when the doors are unlocked. I can unlock it manually using the override lever inside the boot.
not sure how it works. I'm supposing there is usage of a solenoid somewhere.
any ideas anyone please

I think all of thee must have failed by now? I have not seen one working before anyhow. Maybe on a very low mileage pampered car? But basically the solenoids rust in place and seize up. I did try to open one up once, but i think it would need cutting out of its position, so i left it.

I would suggest the best compromise is remove the pin catch on the fuel flap, so it can then be easily opened from the outside.

ok thanks for that.
i'd love to fix mine but I have too much other to do on it at the moment.
might just do what you suggested for now and remove the pin

WOW ! guess what. I've fixed my fuel flap !

I did spray the pin with wd40 last week but it didn't work.

I had l/h brake light fail problems and I sourced it to the rear light module. when I had a look at the module and wiring in that area I noticed a 1 amp bayonet type fuse and a 2 amp glass type inline fuse. I suspected these might have something to do with the fuel flap (done some homework on it online) I pulled both and they seemed ok but I bought new anyway as the fuse wire in the fuses is so fine I couldn't really tell if they weren't broken.

I put new fuses in this morning not expecting anything to work, walked pass the fuel flap and as an after thought pressed it and it popped up to my surprise ! tried it a few times and it kept working. fixed the brake light too.

Great result, very lucky.
I have up changing the fuses as it never worked for me, and once I saw the state of the solenoids.
You are the lucky one though.