You carburetor needs cleaning out. This can happen when the lawnmower sets over the winter with fuel in the carb. Always put in a fuel stabilizer before storing the mower. I would even advise that you run the tank dry and run the carb completely dry of fuel before storing the mower. This will prevent the buildup of fuel deposits and varnish in the carb.
Most common problem is a dirty/clogged fuel filter restricting a good flow of fuel to the engine. Otherwise, the carburetor needs adjustment. Or, if the engine is blowing black smoke before it dies, check the spark plug and the air filter, or a too rich mixture from the carburetor.
It doesn't have a carburetor, it's fuel injected. Could be a faulty fuel pump. See if it will run briefly with a squirt of starting fluid to confirm it's not getting fuel.
It could be that your carburetor needs to be rebuilt.
If your lawnmower stops working after five seconds of use, you may need gas. It can also be a problem with your fuse.
Its possible that the fuel filter is clogged. More likely the fuel pump quit working.
Clogged fuel filter, defective fuel pump, or a carburetor problem.
The engine is running rich. Clean or replace the spark plug and the air filter. If problem persists, close (turn clockwise) the needle valve on the carburetor 1/8 turn.
It doesn't have a carburetor, it is fuel injected. What seems to be the problem?
No, it is incorrect, and should be "it is" or "it's".The problem with the lawnmower is that it's cold. - Here, it's refers to temperature/weather, which is not stated.
Busted diaphragm in the fuel pump. Replace the fuel pump to solve this problem. Can also be a carburetor problem such as a leaking needle valve and seat or a pinhole in the carburetor float. This would require disassembly and rebuilding the carburetor.
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The problem is not the cleaning but the reassembly. There are very special tools required for that. You really need to call around and find out who does overhaul your type of carburetor.