Superb 2011 vibration buzz from under car

I have lived with rpm specific vibration buzz for months and you would think 3 garages and a Skoda dealer would have seen this before -no. Finally found a mechanic on YouTube who realised that it is the fuel pipes vibrating in their enclosed tunnel under the car floorpan. I injected expanding foam into the space-no more vibration buzz. Hope this helps anyone who is still being tortured by this issue!!