No, the carburetor should not be leaking from anywhere. If it leaks from the top of the float bowl, the problem is just about certain to be flooding - but any petrol leak is hazardous and needs to be fixed immediately. That is especially true of ride-ons - a fire right under your backside is low on everyone's list of preferences - but even on a walk-behind mower, a fire under the fuel tank can ruin your day.
