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Fix a Lawn Mower That Won’t Start: Check Gas, Air Filter & More (2023)

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It’s like the classic story of Sisyphus, but instead of pushing a boulder up a hill for eternity, you’re trying to get your lawn mower started. You know there’s something wrong and you just want it fixed already so that life can go on – and maybe even enjoy some outdoor time in the process.

If this sounds familiar to you, then we have good news: There are simple steps that can help fix your lawn mower when it won’t start. From checking the gas tank to cleaning or replacing an air filter, these tips will let you take control over what was once beyond repair (at least in your eyes).

Read on for all our advice about fixing a lawn mower that won’t start—and get ready to bring order back into one small corner of your chaotic world!

Key Takeaways

how to fix a lawn mower that won

  • Check the gas tank, spark plugs, air filter, battery, oil level, fuel line, and carburetor for any issues when troubleshooting a lawn mower that won’t start.
  • Use the proper tools and materials, such as fuel lines, carburetor cleaning kit, ignition system tester, oil change supplies, air filter cleaner, and spark plugs, to fix the mower.
  • Clean or replace the air filter to ensure efficient airflow and prevent dirt buildup.
  • Regularly maintain and troubleshoot the battery, carburetor, oil, and other parts during the peak season to prevent starting problems.

What Are the Steps to Fix a Lawn Mower?

What Are the Steps to Fix a Lawn Mower?
If you’re having trouble getting your outdoor machine up and running, here are some steps to try out!

Start by checking the gas tank. If it’s empty or almost empty, fill it up with fresh fuel and then move on to changing the spark plugs.

After that’s done, clean the air filter in order to make sure any debris is cleared away.

Next step would be testing your battery; this will determine if there is enough power for a successful start-up process.

Following that would be inspecting oil level; if too low, add more until full again – but not overfull!

Lastly, check the fuel line & carburetor for blockages which can affect the proper starting of the engine. Also, check the starter rope for pull-started engines or other ignition components like spark plugs – all these can lead to the failure of the lawn mower when trying to get going again after repair work has been completed.

In short, ensure all necessary parts are properly checked before attempting start-up once more – this should help reduce potential issues down the road while providing peace of mind about reliable operation in future use situations.

Tools and Materials Needed

Tools and Materials Needed
To successfully repair a lawn mower, you’ll need some specific tools and materials. On average, it takes around 50 minutes to complete the task with the right equipment.

To get started, you’ll need several items such as fuel lines, a carburetor cleaning kit or spray cleaner for gasoline-powered engines if necessary, an ignition system tester, oil change supplies including fresh oil and filter, air filter cleaner or replacement element depending on the type of engine used in your mower model, and spark plugs that match those in use by your particular machine make/model.

In addition, don’t forget about using fuel stabilizer when storing any gasoline-powered engine during periods of non-use. This will help protect against damage from condensation buildup due to humidity changes indoors and out over time.

With everything ready, go ahead and begin diagnosing potential issues related directly to starting problems.

Check the Gas Tank

Check the Gas Tank
Checking your gas tank is the first step to diagnose potential issues related to starting problems. Before pulling on that rip cord, you should clean out the fuel tank and replace its filter if necessary.

This will help ensure an efficient flow of gasoline to the engine during operation.

Additionally, make sure all connections are secure and free from corrosion or blockage so air can get in as well! Finally, test both fuel lines for obstruction by disconnecting them from their fittings at each end.

A clogged line could cause problems with starting up too quickly after sitting idle for some time due to lack of lubrication inside it.

Inspecting your lawn mower’s fuel pump is also important when troubleshooting why it won’t start up properly each season. This component helps deliver pressurized gasoline into carburetors, which then allow engines running on petrol-based fuels like these types found in most modern machines today! If any signs of wear show themselves here, such as leaking hoses or broken seals around gaskets/connections, then replacing parts may be required before trying again later down the line.

However, doing regular maintenance checks throughout the year can help avoid costly repairs due down the road later one day unexpectedly catching owners by surprise, just like a heart attack does sometimes too unfortunately.

So don’t forget about checking everything over every now and again between uses, especially before the start of a new season rolls around next time soon enough!

Check the Air Filter

Check the Air Filter
Examine the air filter for any signs of dirt or debris, as clogs can cause your mower to hesitate before leaping into action.

The most common problems with lawn mowers relate to fuel filter cleaning, carburetor adjustment, and oil level testing. However, blade sharpening and air filter replacement are also important steps in maintaining a healthy lawnmower engine.

If you notice that grass clippings are collecting in the drain pan below your machine, it may be time for an air filter change!

Replacing this component is essential if you want performance from your kind of lawnmower. But remember, not just any old part will do – make sure whatever fits has been specifically designed for use with its exact model type.

Otherwise, you risk damaging other parts inside due to incorrect installation or fitting sizes being off by even just one millimeter.

Check every few months and replace when necessary – it’s a small price compared to what could happen if left unattended long enough!

Check the Spark Plugs

Check the Spark Plugs
Investigate the spark plugs to ensure they’re in good condition, as faulty or worn-out ones will prevent your engine from firing up.

To troubleshoot spark plugs:

  1. Inspect connections between the plug and flywheel for any signs of damage or breakage.
  2. Clean plug contacts on both ends using a wire brush if needed. Then, apply dielectric grease before reconnecting them securely together again with the proper torque settings in place.
  3. Replace any parts that show wear, such as gaskets and o-rings, which may have degraded due to heat exposure over time.
  4. Adjust settings like timing belt tensioners (if equipped) by turning clockwise until snug but still able to spin freely when rotated manually at least once per second. Too loose can lead to misfires, while too tight could cause permanent damage down the line later on.
  5. Lastly, check the car battery voltage since low power output can also create similar symptoms as those caused by bad/faulty spark plugs. Use batteries rated specifically for lawnmower applications only because they provide a more consistent charge than other alternatives available today.

Whether you’re dealing with problems related directly to ignition source components such as old and failing part replacements combined with various adjustments necessary to ensure peak performance levels are maintained consistently throughout the lifespan of the machine itself, then following the tips above should help resolve issues quickly and easily.

Troubleshooting Tips

Troubleshooting Tips
If you’re having trouble with a lawn mower that won’t start, there are several things to check.

Start by clearing any debris from the mower deck. Then, inspect the carburetor and fuel filter for signs of damage or blockage.

Test your battery power output too, as this can sometimes be an issue if it’s low on charge.

Cleaning or replacing the air filter is also important since dirt buildup will reduce engine performance over time. Similarly, raising the height on your mower may help depending on where you live geographically speaking.

Finally, as a last resort, consider calling in a professional technician who has experience dealing with these types of issues regularly and knows exactly what needs doing right away without wasting any more precious time than necessary!

Check for Debris in the Mower Deck

Take a look and see if there is any debris or obstructions that may be preventing your mower from starting. Inspect the blades, connections, and filter for any clogs, and clear out any debris. Additionally, lubricate the blades and replace the deck if necessary. Experiencing rough idling? Refer to the manufacturer’s manual or contact a local lawn care service to handle cutting tall grass.

Check the Carburetor

Check the carburetor to make sure it’s not running on empty – give it a thorough inspection. Cleaning the lawn mower’s carburetor can be challenging, but it is necessary for maintaining proper air pressure and fuel line flow.

To adjust the gas ratio, you can try cleaning the spark plug; if that doesn’t work, examine the combustion chamber of your lawn mower.

Check the Fuel Filter

Examine the fuel filter – it may be clogged, preventing power. Replacing or cleaning it with a mixture of gasoline and following proper steps can help get your engine running again.

Test the Battery

Test the power of your battery to ensure it is supplying enough energy for the mower. Check spark plugs, fuel filter, oil level, and mower deck too. Battery test is important – Robert Maxwell says black smoke means a new mower! Good news? The starter motor could be the culprit if all else fails.

Check the Oil Level

See if your oil level is up to par – it could be the key to getting your engine running again! Check the gasoline, replace the blades, clean the carburetor, and adjust the height. Test the spark on heavy machinery or take a trip to an inexpensive local lawn mower repair shop for smaller push models and electric riding mowers.

Clean or Replace the Air Filter

Clean the air filter or replace it if necessary to get your engine going again. Check the fuel quality, replace the fuel line, and change the oil filter for an easy solution. A common problem could be a clogged air filter – a common reason why a lawn mower won’t start – so adjust the mower height and clean the blades as part of troubleshooting how to fix it! More serious repair may be needed; always check with an expert first.

Raise the Height of Your Mower

Raise the height of your mower for optimal blade adjustment and engine troubleshooting. Sharpening blades often helps with grass cutting; maintain a regular maintenance schedule to keep it running smoothly.

If this is done, that’s usually a good sign – one of the most common reasons why lawn mowers won’t start.

When to Call a Professional

If troubleshooting is unsuccessful, it might be time to call in a professional. Check fuel lines, inspect oil, diagnose the carburetor, replace blades, and clean the air filter for optimal lawn mower performance.

Be sure to keep up with regular maintenance such as sharpening blades, or an empty gas tank may be the culprit of your woes! If all else fails, consider calling an expert who can assist you in resolving further issues.

Frequently Asked Questions (FAQs)

What type of fuel should I use for my lawn mower?

You need to use the correct fuel for your lawn mower. Look for unleaded gasoline and a motor oil that is specified by the manufacturer – this will help ensure optimal performance.

How often should I change the oil in my lawn mower?

Change your lawn mower’s oil every season. Regularly replacing the oil will help keep it running smoothly and prevent any costly repairs down the line.

What type of oil should I use for my lawn mower?

To optimize performance, use oil specifically designed for your mower. Look for an oil labeled SAE 30 or 10W-30 that meets the standards set by API Service Classification SJ or higher.

How do I know when to replace my lawn mower’s spark plug?

Replacing your spark plug is crucial for maintaining optimal mower performance. Regularly inspect it and replace it if you observe a decrease in power or efficiency. Additionally, if the engine fails to start, this is also an indication that the spark plug needs to be replaced.

Is there an easy way to clean the air filter on my lawn mower?

Clean your lawn mower’s air filter quickly and easily. Unscrew the cover, remove the filter, rinse it with soapy water, and let it dry before replacing.


Your lawn mower should now be running smoothly. But if you’re still having difficulty getting it to start, there are a few other things you can try.

Make sure you clear any debris from the mower deck, check the carburetor, fuel filter, and battery.

If these steps don’t help, it’s time to call in the professionals. Don’t be intimidated by the thought of a repairman. A qualified technician will be able to quickly diagnose and fix any underlying issues efficiently.

Plus, they’ll be able to provide you with tips and advice on how to keep your mower running smoothly for years to come.

Avatar for Mutasim Sweileh

Mutasim Sweileh

Mutasim is a published author and software engineer and agriculture expert from the US. To date, he has helped thousands of people make their yards lush and thick.