It depends on the lawnmower some have in line valves which you should be able to see at the gas tank or close to the carb.But most just use the float to control the gas flow if it won't shut off the float is probably stuck if so try putting some good carb. cleaner threw it.
Hope this helps.
A gas lawn mower is a lawn mower which is powered by gasoline.
Either you don't have gas in it. You have the gas valve off. Or the blade is stuck to itself.
Dirty or stuck open needle valve in carburetor.
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Can I buy a replacement gas cap for.my riding lawn mower
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make sure the gas valve is turned on and you put the air filter in right
drain it
1958
No
A lawn mower works by converting chemical energy (energy stored in the gas) to mechanical energy.