Have you all checked that the spring on the flap is there? If you can pull the lever then get out of the car and open the flap by hand, there is obviously nothing wrong with the cable. Its quite common for the release spring on the flap to fall off.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i