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What is this in? And can you see the tank or do you have to take some of the underbelly loose first?
They that is what you need to do so you can see if the problem is that the top of the tank ruptured or the end split out at the outlet. Both are common on those Kart tanks. Cheap ABS plastic! I never use them when I have tank issues like this and only use polypropylene tanks that won't break. About $249 if you need a new one. IF you got lucky and only have a problem AT the tank inlet or vent you might be able to repair that. And you can usually hose off the hard parts and replace the insulation. I will make a phone chat option offer for you in case you feel that would be more productive and faster here.......especially if you plan on repairing this yourself. All follow ups are included in our fee.