[NinjaBraap]

Just remove it, they're for getting the bike basically into the US for dealers to sell. They don't do anything really other than catch any spilt or condensate fuel, and are basically dead after a couple years anyway. It's just adding unnecessary weight and reducing your access to and increasing times to work on the bike.

 

[NinjaBraap]

OK, what do I do with the hoses that go to it and won't the ECU complain?

You already said you looked it up, but search again. Just get the right resistor in the plug so it doesn't throw a check engine light. No, the ECU doesn't care, since this literally has nothing to do with the fuel/air mixture, which is all the ECU does. Just run a hose from the vent line to the back of the bike, and cap off the other one. Be sure you don't cap off the tank vent line, otherwise it'll build up pressure and might cause issues, you'll know pretty soon afterwards if you got the wrong one lol. If you cap off the vent line then after riding a full tank of fuel it'll be hard to open the fuel tank cap.