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from around the fuel cap or the fuel can you use to fuel it. if it is a metal fuel tank then you can get rust built up in it and it starts to flake off
it may not have one. If it does it will be located on the fuel line between the fuel tank and the carburetor.
it will probably explode or it will burst into flames either or its bad
That will vary for each make and model of mower.
Lawn mower gas mileage is generally categorized by gallons-used-per-hour, and the larger the motor's horsepower, the more fuel is used. A riding mower, for instance, with a 12 h.p. motor, and a one-gallon-tank, in middle-gear, will get around two hours per gallon.
bubbles on top of gas in tank
on the fuel line running from the tank to the carb.
A Wheel Horse riding lawn mower that ran out of gas and will not turn over after refilling the gas tank might be vapor locked. Maybe it will start after it sits a while with the gas cap off. There isn't much else a person can do if the tank vapor locked.
Possible buildup in the line from the gas tank to the carb.
There will be an inline filter on the fuel supply line from the tank to the carburetor
Lawn mower-under 1 gallonSemi-over 100 gallonsLawn mower-under 1 gallonSemi-over 100 gallons
Fuel tank cap vent is plugged.