Most likely you have to replace the wax seal. You can do this by going to the hardware store and buying a wax seal in the Plumbing department. Next, you turn off the water to the toilet ( empty it by flushing it AFTER you have the water off). Now, you unscrew the screws on the base of the toilet, next you lift the toilet off . Now, you will see the old wax seal. Remove it. Put the new one on. Replace the toilet, redo the screws, start the water back. You should be ready to go. You can also call a plumber in to do it for a 60.00 service call and his labor would probably cost you a 100.00 to 150.00. I know all of this because I have replaced 3 wax seals.
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?
Only if it is leaking there. They do sometimes, but not that often. If you have taken the tank off for some reason, you should probably go ahead and change it.
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.
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.
The wax ring which seals the toilet to the drain is leaking. turn off water, drain tank by flushing. Disconnect water line. remove tank, unbolt toilet from floor. Remove any old wax from toilet and drain. Replace with new wax ring. Reset toilet and press firmly into place.
The flush valve (flapper) is leaking slightly, lowering the water level in the tank. To see if the flapper is leaking, put some food coloring in the tank and see if the color shows up in the bowl. This means the flapper is leaking by. Do not flush toilet for a while to see if the food coloring shows up in the bowl
Your question isn't very clear. Toilet must be leaking somewhere. Shut off valve, supply line, the seal between the tank and the bowl or the wax ring underneath the toilet. In warm weather, the tank can sweat if the water filling it is cold in high humidity. It pretty much has to be one of these places.
The width of a toilet tank can vary in size. The average width of a toilet tank is about 18 inches.
adjust the floating bulb, it may be running over the top of the overflow pipe
spray WD40 ON IT
You can stop a leaking gas tank, by making a paste of soap on the hole of the gas tank.
They are called tank bolts.