Why does my lawn mower start and then stall?

A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.

Why does my lawn mower start and then die?

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that’s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.

Why does my lawn mower run for a few minutes then stops?

If your lawn mower starts, runs for a while, then dies, check the ignition coil, gas cap, and spark plug. … If your lawnmower starts up but then dies in the middle of mowing your lawn, you could have a bad spark plug. The spark plug works with the ignition coil to create a timed spark in the cylinder, causing combustion.

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What causes a lawnmower to stall?

Being Overworked. One of the most common reasons that a lawn mower might stall while it is cutting grass is that it is being overworked. This is a mechanism that is intentionally incorporated into the mower to prevent the motor from being blown.

How do you clean a carburetor on a lawn mower without removing it?

However, you can not spray the carburetor when the engine is off since it cannot do the cleaning without being propelled. All you need to do is to start the engine and spray directly at the center of the carburetor while it is running. Any deposits clogging in the carburetor will easily be removed.

How do you clean a clogged carburetor on a lawn mower?

Step-by-step guide to cleaning lawn mower carburetor

  1. Safety first. …
  2. Check to see if the problem really is the carburetor. …
  3. Remove the outer casing and air filter. …
  4. Unbolt the carburetor and remove it from the fuel line. …
  5. Unbolt the bowl and clean the nut. …
  6. Replace the needle.

Why does my mower only run when I push the primer?

When you prime the engine you are manually adding extra fuel in, so the running issue is most likely related to poor fuel that will not burn unless there is an excess amount present or a fuel deliver issue preventing enough fuel from getting through to begin with.

How do I know if my lawn mower spark plug is bad?

How to Tell When it Is Time to Change the Spark Plug in a…

  1. Hard Start. The most common problem associated with a bad spark plug in a lawnmower is that the mower is more difficult than normal to start. …
  2. Poor Engine Performance. …
  3. Excessive Fuel Consumption. …
  4. Physical Appearance.
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Will a bad spark plug cause a lawn mower to stall?

Poor Engine Performance



A bad spark plug often causes an engine cylinder to misfire or sound like it’s struggling. The engine might even stall out completely while you are mowing. You may also notice that it becomes increasingly more difficult to restart the mower each time that it dies.

What stops a lawn mower from running?

Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas. If this doesn’t work, you might need a new fuel filter.

What causes a lawn mower to stop running when it gets hot?

Vapor Lock



A simple, often overlooked, trigger for an engine stall occurs when the heated gases inside the fuel tank can’t vent properly. The pressure causes the gas flow to reverse and move out of the carburetor, effectively shutting the engine down.

Why does my lawn mower stall in high grass?

Loss of Air Causing the Mower to Stall



The loss of air flow to the engine caused by too tall or too thick grass or a dirty air filter is often the reason a mower engine stalls. … When you try to mow on overgrown lawn, you end up clogging the air filter and shutting off air to the engine.

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