follow this steps and fix it. God bless you
Carburetor
If the lawn mower engine stops after a few
seconds, the carburetor might be clogged or have bad fuel in the float
bowl. If old fuel was left in the lawn mower for a long time some of the
volatile ingredients may have evaporated, leaving a thicker, stickier
product that is more like varnish or shellac. This sticky fuel can clog
up the small jets and ports in the carburetor and it can be difficult to
burn allowing the engine to only run for a few seconds. The only
solution is to drain the old fuel from the float bowl and thoroughly
clean the carburetor with carburetor cleaner. If that isn't effective,
replace the entire carburetor.
Carburetor Kit
If the engine stops after a few seconds it
may not be getting enough fuel. The engine needs air, fuel and spark to
maintain operation. The carburetor has two inputs, fuel from the gas
tank and air through the air filter. The carburetor is designed to mix
the air and fuel in a consistent ratio so that the engine can run
continuously. If the carburetor is not getting enough air or fuel, or if
the fuel is blocked inside the carburetor the engine stops after a few
seconds. Rebuild the carburetor with this carburetor kit.
Gas Cap
If the lawn mower engine stops after a few
seconds and then stops running, the gas cap might be defective. All gas
caps have a small vent to allow air back into the tank when the engine
is running - otherwise as gas is drawn from the tank it would create a
vacuum. The vent can be difficult to see and there are many different
types of vent. If loosening the gas cap a little allows the engine to
stay running, replace the gas cap. It's sometimes possible to clean the
vent, but on most newer engines the vent cannot be cleaned, it should be
replaced.
Gas Cap with Gauge
If the lawn mower engine stops after a few
seconds and then stops running, the gas cap with gauge might be
defective. All gas caps have a small vent to allow air back into the
tank when the engine is running - otherwise as gas is drawn from the
tank it would create a vacuum. The vent can be difficult to see and
there are many different types of vent. If loosening the gas cap a
little allows the engine to stay running, replace the gas cap. It's
sometimes possible to clean the vent, but on most newer engines the vent
cannot be cleaned, it has to be replaced.
Old or Bad Gasoline
If the lawn mower stops after a few seconds,
the carburetor might be clogged or have old or bad fuel in the float
bowl. If old fuel was left in the lawn mower for a long time some of the
volatile ingredients may have evaporated, leaving a thicker, stickier
product that is more like varnish or shellac. This old or bad fuel can
clog up the small jets and ports in the carburetor and it can be
difficult to burn allowing the engine to only run for a few seconds. The
only solution is to drain the old or bad fuel from the float bowl and
thoroughly clean the carburetor with carburetor cleaner. If that isn't
effective, replace the entire carburetor.
Spark Plug
If the lawn mower engine stops after a few
seconds the spark plug might be defective. All small engines have an
ignition coil. The coil is the device that provides spark for the spark
plug(s). If the coil is bad there won't be spark to the plug(s). The
coil is essentially a small, induction generator. It is mounted next to
the flywheel. The flywheel has one or more strong, embedded magnets. As
the flywheel spins, the magnet(s) zip past the induction coil, this
action of a magnet passing past a coil induces a voltage. Depending on
the design of the coil and the strength of the magnets, a stronger or
weaker spark can be created and delivered to the spark plug(s). Each
time the flywheel spins around a spark is generated. The best way to
test a spark plug is to use a spark plug tester. The spark plug should
have a strong, visible spark between the electrodes when the engine is
cranking. If it doesn't, replace it.
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