how to fix a broken gas cap door

Can't help with information on the cost of a new lid as I live over the ditch, but super glue won't cut it either as it doesn't stick most plastics. Araldite would be a better bet if you're forced to go down this route but I'm with you on wanting to fix it properly. If you're already prepared to do a spray job, why not look at a wreckers? gotta be cheaper than a new one which will need a spray paint anywayz.

the fuel door is held on by two screws, remove these and replace with the new door

I know this is an old as the hills thread, but I thought this would be helpful since I see so many VT/VX running around with no fuel door.

I broke mine off a few weeks ago, and to fix it all it took was some decent epoxy glue. Cost like $6 from Bunnings, sets in about 3 minutes and fully hard in about 12 hours. My door is now good as gold, though it doesn't look as pretty, who the hell looks at the inside of their fuel door . I didn't use any clamps or anything else, just held together with my hands for 3 minutes, added some more layers, 3minutes, more layers, until it covered a good deal of surface area on the flap and the hinge.

Just use two part epoxy glue,not superglue. I got one that comes with some nozzle that it mixes itself before it comes out, very handy.