Greetings from New Zealand. Twice in the last month, my fuel tank pressurises and allows fuel to bypass the filler cap and drain to the ground via the small overflow pipe below the filler neck. This occurs even with only half full capacity. NZ franchise service dealer has never heard of the problem and advises that there are no technical service bulletins that refer to this problem. When I discovered it, I released the fuel cap and was able to hear a rush of air escape the tank and a small amount of fuel drain back down the filler neck. I note on earlier forums here that this is not an unknown problem in the UK. Has anyone solved the problem yet and how? Just love the car, but need this possibly dangerous fault remedied!