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check your pinion seal
If its leaking from the gas tank directly, then yes...but it could also be leaking from the gas line or the engine or any of the connections in between.
Percy is the small engine.
An "unlevel" toilet flange might be a little difficult for a wax ring to seal, but could not in any way be responsible for a tank leak. If the tank is leaking between the tank and bowl, remove the tank, check the tank itself for a crack or defect, then check the flange gasket and tank bolts and gaskets. How do you know your flange is unlevel?
If the gas isn't leaking while the engine is running and you have half a tank, then the problem is with the fuel tank itself. You either have a hole in the upper half of the tank, or the gasket for your fuel sending unit is leaking.
You can stop a leaking gas tank, by making a paste of soap on the hole of the gas tank.
Where is it leaking ? Flapper in the tank, replace flapper. Between tank and bowl, separate and replace the seal. Toilet to floor. Replace the wax ring under the toilet, making sure it is thick enough to form a seal and the bolts are installed correctly and holding the toilet down.
Either the cap isn't on tight, the seal is bad or some other part of the tank is leaking air.
Coolant is leaking- either onto the ground or into the engine where it mustn't.
A small leak in the vapor system from the tank to the engine.
If it's leaking between the toilet and the floor, you put the wax ring in wrong. If it's leaking between the toilet and the tank, you need to replace the gasket.
The overflow tank is either cracked or its overheating and leaking from the cap