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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.If you can tell me the year , make and model of your VW I will have a look at the fuel door control system and see if I can help you with this if you are still needing help. Post back with complete information and we can work from there.
Yes is very possible the water intrusion is causing a problem and the first thing you are going to need to do it to get the water removed and see if you can get things to dry out. In the mean time , pop the fuel door switch out and check and see if you have power in and out of it while pressing the switch. See the removal steps in the link below.