Fuel leaking from the purge canister

Could be. There's two, perhaps three hoses to the tank. One is the high pressure line to the injectors, the second is low pressure return from the injector rail, and a third is the evaporative (purge) line. Get the last two mixed up (often the same size) and I'd expect a leak.

SD

Hi SD, you are really an expert. Thing is just as you said. I sent my car to the garage today. After they switched those two lines, there is no leaking again so far. Although it needs to drive a while for further verify, I think the problem has been fixed.

BTW, since a lot of fuel went through the canister, I wonder if it would damage the canister or the valve or any other parts?

Thanks a lot for your help.

Best regards, Fred

The fuel may damage the canister, but probably not.

Thanks, Ray.

After driving for two days, everything is ok. The canister seems ok too since I didn't get any gas fume.

Thank you and SD again for your help, Fred

You're welcome! Glad to hear you are back in business.