This came up on mine again yesterday (after months of being ok) - EML came on a day after filling the tank to the
brim. Weirdly happened after giving the car foot-to-floor in 2nd to redline at the same place and tank level as before, guess it just shows under the same conditions the car will throw the same fault.
Vagcom scanned the car today, and the same P0441 fault appeared. Have cleared the fault & light is off, with car driving ok. I really must get on & fit the new canister and hoses I've bought...