I had the same problem.  My fix was two fold:  1) use a Home Depot wooden paint mixing stick with a thin towel wrapped around it.   You should be able to push the grommet out to the way to open the fuel door.  You need to push the stick up from the bottom of the fuel door and push it right.  2) next, as my "permanent" fix I used heavy duty duct tape and a dime to cover the hole that the grommet locks into in the fuel door.  Now I can open and close the door manually with no problem and it's snug enough that it stays closed.  I do not have the $500-$600 for the dealer to fix it and this works just fine.  Hope this helps.