The electric locking mechanism for the fuel door on my Kizashi does not appear to be locking. If I manually lock it the door lock will open it. I tested the actuator with a battery and it opens with voltage and closes when I reverse the polarity, so the actuator is not the problem. What triggers the gas cap door lock actuator to close?
Not sure what you mean by "manually lock it", I thought it was locked or unlocked along with the doors.
I know the tether for the gas cap can get in the way of the latch. I had mine that way once and the gas door kept opening up as I drove. Just removed the cap, turned the tether around the other way as I put it back on.