Fuel Filler Lid Fix
The fuel filler lid of our red project car only opened intermittently when using the release button. When it didn't work, we had to use the manual release to get it open. There was a pretty unpleasant groan from the solenoid whenever we used the manual release, so I pulled out the carpets to investigate. Turns out, the solenoid 'plunger' needed to be lubricated. This is also a good thing to do for preventative maintenance.
DISCLAIMER: As always, follow all safety protocols. Don't undertake this task if you aren't comfortable with it and fully understand it. You are ultimately responsible for anything you do. Neither Redpants, LLC or myself is responsible or liable for anything that may occur.
WD40 or other lubricating spray
Paper towel or rag
About 5 minutes
Open up the cubby in the left-hand side (driver side in the US) of the trunk. The solenoid is located above the navigation system's DVD drive.
Spray the WD40 (or other lubricant) into the solenoid where the white 'plunger' goes into it. Having an aiming straw will help tremendously to make sure the lubricant gets inside and doesn't make a huge mess. Use the paper towel or rag to clean up any mess you make.
Open and close the fuel filler lid several times to work the lubricant into the solenoid. You may need to use the manual release loop the first few times, then you should be able to use the button inside the cabin.