dang solenoid thing i guess

after waiting for replies,I had talked to a friend that called a "dealers" .....service dept. by hitting the unlock btn on the remote ,and at the same time someone taps the rear fender close to the fuel door near the rear top of the car it opened,dont know if if it was the wd40 or the tap ...

1st time here, my problem is the release on the fuel door,tether for fuel cap wore out and must have been hanging in the way of course when anyone else drives this car something malfunctions,pushed tether back inside but the door wont release .20degrees out and need to gas up . sprayed wd40 inside t...