Why Won’T My Lawnmower Stay On? Find Solutions Here!

Quick Answer: If your lawnmower won’t stay on, the problem is likely related to either the fuel system, such as a clogged carburetor or fuel line, or an issue with the ignition system, like a faulty spark plug or ignition coil.

Have you ever experienced the frustration of trying to mow your lawn, only for your lawnmower to sputter and die after a few seconds? It can be incredibly frustrating, especially when you have a to-do list as long as your arm. But fear not! In this article, we’ll delve into the reasons why your lawnmower won’t stay on and provide you with some practical solutions to get it back up and running smoothly.

Before we get into the nitty-gritty, it’s important to understand that lawnmowers are complex machines with various components that work together to ensure proper operation. Any malfunction or blockage in these parts can cause the engine to stall. So, let’s roll up our sleeves and uncover the possible culprits behind your lawnmower woes.

Why Won't My Lawnmower Stay On? Find Solutions Here!

Why Won’t My Lawnmower Stay On?


Maintaining a well-kept lawn requires a lawnmower that is in good working condition. It can be frustrating when your lawnmower constantly shuts off or refuses to stay on. While there can be various reasons behind this issue, it is essential to address the problem promptly to ensure your lawnmower operates efficiently. In this article, we will explore the common causes of a lawnmower that won’t stay on and provide practical solutions to help you get back to a perfectly manicured lawn.

1. Lack of Fuel

One of the first things to check when your lawnmower won’t stay on is the fuel level. Running out of fuel or having a low fuel level can cause the engine to sputter and eventually shut down. Here are a few troubleshooting steps to consider:

  • Check the fuel tank: Ensure that your lawnmower has an adequate amount of fuel. If the fuel level is low, refill the tank.
  • Inspect the fuel line: Over time, the fuel line may develop cracks or blockages, preventing the proper flow of fuel to the engine. Inspect the fuel line for any signs of damage or clogs. If necessary, replace the fuel line.
  • Clean the fuel filter: A clogged fuel filter can restrict the flow of fuel to the engine, causing it to stall. Clean or replace the fuel filter if it appears dirty or clogged.
Read also  Is Mowing The Lawn At 8Am Considered Rude?

2. Carburetor Issues

The carburetor plays a crucial role in regulating the fuel-air mixture needed for the engine to run smoothly. If the carburetor is malfunctioning, it can cause your lawnmower to stall frequently. Consider the following steps to address carburetor issues:

  • Clean the carburetor: Over time, dirt, debris, and old fuel can clog the carburetor, obstructing the proper flow of fuel. Remove the carburetor, disassemble it, and clean all the components thoroughly. Pay close attention to cleaning the jets and passageways.
  • Inspect the carburetor gasket: A worn or damaged carburetor gasket can lead to air leaks, disrupting the fuel-air mixture. Inspect the gasket for any signs of wear and replace it if necessary.
  • Adjust the carburetor settings: If you’re familiar with carburetor adjustments, you may need to fine-tune the settings to ensure the ideal fuel-air mixture. Refer to your lawnmower’s manual for specific instructions on adjusting the carburetor.

3. Spark Plug Problems

A faulty spark plug can also be a contributing factor when your lawnmower won’t stay on. The spark plug provides the necessary spark to ignite the fuel-air mixture, powering the engine. Follow these steps to troubleshoot spark plug issues:

  • Inspect the spark plug: Check the spark plug for signs of wear, such as a worn electrode or heavy carbon buildup. If the spark plug is damaged or too dirty, replace it with a new one.
  • Adjust the spark plug gap: Ensure that the spark plug gap aligns with the manufacturer’s specifications. Use a gap gauge to adjust the gap if necessary.
  • Check the spark plug wire: A loose or damaged spark plug wire can disrupt the electrical connection, preventing the spark plug from firing consistently. Inspect the wire for any damage or loose connections and replace if needed.

4. Air Filter Troubles

A clogged or dirty air filter can impede proper airflow to the engine, leading to stalling issues. Maintaining a clean air filter is vital for optimal lawnmower performance. Consider the following steps to address air filter problems:

  • Inspect the air filter: Check the air filter for dirt, debris, and excessive oil buildup. If the air filter is dirty, clean it, or replace it if it’s beyond cleaning.
  • Replace the pre-filter (if applicable): Some lawnmowers have a pre-filter that traps larger particles before they reach the main air filter. If your lawnmower is equipped with a pre-filter, ensure it is clean or replace it if necessary.
Read also  How To Drain Gas From Lawn Mower Without Siphon?

5. Overheating Engine

An overheating engine can cause a lawnmower to shut off unexpectedly. If your lawnmower consistently stalls due to overheating, consider the following solutions:

  • Clean the cooling fins: Over time, the cooling fins on the engine can accumulate dirt, grass clippings, and debris, obstructing airflow. Clean the cooling fins using compressed air or a soft brush to improve cooling efficiency.
  • Check the engine oil level: Insufficient oil levels can lead to increased friction and heat in the engine. Ensure the oil level is within the recommended range. If needed, change the oil and replace the oil filter.
  • Inspect the cooling system: Examine the cooling system components, such as the radiator and coolant reservoir, for any leaks or blockages. Repair or replace any damaged parts as necessary.

A lawnmower that won’t stay on can be a frustrating issue to deal with. By addressing the common causes discussed in this article, such as fuel problems, carburetor issues, spark plug problems, air filter troubles, and overheating, you can troubleshoot and resolve the problem effectively. Remember to perform regular maintenance on your lawnmower to prevent these issues from occurring. With the right care and attention, you’ll have a lawnmower that stays on, allowing you to effortlessly maintain a beautiful lawn.

Lawn Mower starts and then dies, turned out to be an easy cheap fix -Loctite!

Frequently Asked Questions

Why won’t my lawnmower stay on?

Here are some frequently asked questions and answers regarding lawnmowers that won’t stay on.

1. What could be the reason my lawnmower keeps shutting off after starting?

There could be several reasons for this issue. One common cause is a dirty or clogged air filter, which can restrict airflow and lead to engine stalling. Another possibility is a malfunctioning spark plug that needs to be cleaned or replaced. Additionally, check if the fuel line is properly attached and not blocked.

2. Is it possible that the fuel quality is affecting my lawnmower’s performance?

Yes, poor fuel quality can contribute to a lawnmower’s inability to stay on. Stale or contaminated fuel can cause blockage, affecting the flow to the engine. It is recommended to use fresh gasoline and avoid using old or untreated fuel.

Read also  Top Riding Lawn Mower Engine Review For Excellent Performance

3. How can I troubleshoot if the lawnmower’s carburetor is causing the issue?

If the lawnmower is not staying on, the carburetor may be the culprit. Start by ensuring that the carburetor is clean and free from debris. If cleaning doesn’t resolve the problem, adjusting the carburetor’s settings may be necessary. Refer to your lawnmower’s manual for specific instructions on carburetor maintenance and adjustment.

4. Could a faulty ignition coil be responsible for the lawnmower’s stalling?

Yes, a defective ignition coil can cause intermittent engine stalling. When the ignition coil fails to deliver a consistent spark to the spark plug, the engine may shut off unexpectedly. If you suspect an issue with the ignition coil, it is recommended to have it tested or replaced by a professional.

5. What else should I check if none of the above solutions fix the issue?

If the lawnmower still won’t stay on after trying the suggested solutions, it is advisable to check the fuel lines for any blockages or leaks. Additionally, inspect the mower’s safety features, such as the kill switch or safety interlock system, to ensure they are functioning properly. If the problem persists, seeking assistance from a qualified technician or lawnmower repair service may be necessary.

Final Thoughts

If you are struggling with your lawnmower constantly shutting off, there could be several reasons behind this issue. One possibility is a dirty air filter, which can starve the engine of air and cause it to stall. Another common culprit is a clogged fuel line or carburetor, impeding the flow of fuel to the engine. Additionally, a faulty spark plug can prevent proper ignition and keep the lawnmower from staying on. To address these issues, regularly clean or replace the air filter, inspect and clean the fuel system, and ensure the spark plug is in good condition. By addressing these potential causes, you can troubleshoot and resolve the problem of why your lawnmower won’t stay on.