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Why Won’t My Leaf Blower Start?- (Possible Causes & Fixes)

When you’re ready to tackle your yard work, there’s nothing more frustrating than a leaf blower that refuses to start. It can bring your outdoor tasks to a halt and leave you scratching your head, wondering what could be causing the problem.

However, with a little troubleshooting, you can often identify and fix the issue, getting your leaf blower back in action quickly.

In this article, we will explore the most common causes of leaf blower starting problems and provide solutions for each.

Whether you’re a seasoned gardener or a new homeowner, this guide will help you troubleshoot and fix your leaf blower so you can get back to maintaining your yard in no time.

Why Won't My Leaf Blower Start

How to Identify a Leaf Blower That Won’t Start

Before delving into the possible causes and solutions, let’s first understand how to recognize a leaf blower that won’t start.

Typically, when you pull the starter cord or press the ignition button, the engine should come to life with a smooth roar.

If your leaf blower fails to start, you might encounter one or more of the following scenarios:

  • The engine doesn’t respond at all, remaining silent despite your attempts to start it.
  • You hear clicking or sputtering noises, but the engine doesn’t fully ignite.
  • The engine starts briefly but then quickly dies out.
  • The pull cord feels jammed or doesn’t recoil properly after pulling.

Causes of Leaf Blower Starting Problems and How to Fix Them

If you’re experiencing any of these issues, it’s time to dive into the possible causes and solutions for getting your leaf blower up and running again.

1. Spark Plug Issues and Fixes – Carbon Buildup and Weakened Electrode

A Leading Cause One of the most common causes of a leaf blower failing to start is spark plug issues. Over time, carbon buildup can occur on the spark plug, hindering its performance.

Additionally, the electrode, which creates the spark needed for ignition, can weaken and degrade with extended use. When the spark plug is compromised, it can prevent the leaf blower from starting.

Inspecting the Spark Plug for Damage or Wear

To determine if the spark plug is the culprit behind your leaf blower’s starting problem, you need to inspect it for any damage or wear. Start by disconnecting the spark plug wire and removing the spark plug using a spark plug socket wrench.

Examine the spark plug carefully for the following signs:

  • Fouling: If the spark plug is covered in black, oily residue, it may be fouled and unable to create a spark effectively.
  • Damaged electrode: Check if the electrode is bent, broken, or excessively worn down. A damaged electrode will hinder the spark plug’s performance.
  • Excessive carbon buildup: Inspect the tip of the spark plug for excessive carbon deposits. A buildup of carbon can cause the spark plug to misfire or not ignite at all.
Using an Ignition Tester to Diagnose a Defective Spark Plug

If you’re unsure whether the spark plug is functioning correctly, you can use an ignition tester to determine its condition. An ignition tester is a simple tool that allows you to check if the spark plug is producing a spark when the engine is cranked.

To use an ignition tester, follow these steps:

  1. Reconnect the spark plug wire to the spark plug.
  2. Attach the ignition tester to the spark plug wire.
  3. Firmly hold the ignition tester against a metal surface on the engine, away from the spark plug hole.
  4. Pull the starter cord or press the ignition button to crank the engine.
  5. Observe the ignition tester for a visible spark. If you see a strong spark, the spark plug is likely not the issue. However, if there is no spark or the spark is weak, it indicates a defective spark plug that needs to be replaced.

Importance of Regular Spark Plug Replacement

As a general guideline, it’s recommended to replace the spark plug in your leaf blower once a year, even if it appears to be in good condition.

Regular replacement ensures optimal performance and reduces the likelihood of starting issues.

When purchasing a new spark plug, refer to the manufacturer’s specifications to ensure you select the correct type and gap size for your specific leaf blower model.

2. Fuel System Problems and Possible Fixes

Old Fuel Residue and Carburetor Restrictions Another common culprit behind a leaf blower’s failure to start is related to the fuel system.

When old fuel is left sitting in the tank for an extended period, it can degrade and leave behind residue. This residue can find its way into the carburetor, leading to clogs and restrictions in the fuel flow. As a result, the leaf blower may struggle to start or not start at all.

Use Stabilizers As a Solution

The Significance of Using Fresh Fuel and Fuel Stabilizers To avoid fuel-related starting issues, it is crucial to use fresh fuel when filling your leaf blower’s tank.

Fresh fuel ensures optimal combustion and reduces the risk of clogs in the fuel system.

Additionally, consider using a fuel stabilizer when storing your leaf blower for an extended period.

Fuel stabilizers help maintain the quality of the fuel, preventing degradation and residue formation.

3. Opt for Pre-mixed Fuel

For even better fuel stability, you can opt for pre-mixed fuel and oil products that are specifically designed for small engines like leaf blowers.

These products often come in a convenient, ready-to-use formula and are typically ethanol-free, further reducing the chances of fuel-related problems.

Pre-mixed fuel comes in pre-measured containers, ensuring the right balance and eliminating the risk of running the engine with an improper fuel mixture. Using these products not only simplifies the refueling process but also promotes better engine performance and reliability.

When selecting a pre-mixed fuel and oil product, look for one that is specifically labeled for two-stroke engines, as most leaf blowers utilize this type of engine. Follow the manufacturer’s instructions regarding usage and storage to maximize the benefits of the pre-mixed fuel and oil mixture.

Clean The Carburator to Eliminate CLogs

Carburetor Cleaning to Eliminate Clogs If you suspect that the carburetor is clogged, cleaning it can often resolve the starting issue.

  • Begin by removing the air filter cover and air filter to access the carburetor.
  • Once you have access to the carburetor, use a carburetor cleaner specifically designed for small engines.
  • Spray the cleaner into the carburetor’s intake and other accessible openings.
  • Allow the cleaner to sit for a few minutes, then use a soft brush or toothbrush to gently scrub away any debris or residue.
  • After cleaning, use compressed air or a gentle stream of water to rinse the carburetor and ensure all cleaner and loosened debris is removed.
  • Allow the carburetor to dry completely before reassembling the components and attempting to start the leaf blower.
Carburetor Repair Kit or Replacement

Making the Right Choice If cleaning the carburetor doesn’t resolve the issue, it may be necessary to repair or replace certain components.

Carburetor repair kits are available for many leaf blower models and contain replacement parts such as gaskets, diaphragms, and seals.

These kits allow you to replace worn or damaged components, restoring proper fuel flow and increasing the chances of a successful start.

In some cases, if the carburetor damage or wear is extensive, it may be more practical to replace the entire carburetor assembly. Consult your leaf blower’s manual or a professional for guidance on the appropriate course of action based on your specific situation.

3. Starter Assembly and Recoil Issues

The starter rewind spring is an essential component of the leaf blower’s starting mechanism. It is responsible for the retraction of the starter cord after it has been pulled, allowing for repeated starting attempts.

However, if the rewind spring becomes broken or damaged, it can result in the cord not recoiling properly, making it difficult or impossible to start the leaf blower.

Replacing Individual Rewind Springs vs. the Entire Assembly

In some cases, the rewind spring itself may become worn or broken due to regular use or excessive tension.

Fortunately, many leaf blower models offer the option to replace the rewind spring individually.

This allows for a more cost-effective and straightforward solution to address the issue.

However, in certain instances, the damage to the starter rewind spring may be extensive or accompanied by other issues in the starter assembly.

In such cases, it may be easier and more efficient to replace the entire recoil starter assembly. This assembly includes not only the rewind spring but also the starter pulley, rope, and other associated components.

When deciding whether to replace the individual rewind spring or the entire recoil starter assembly, consider the extent of the damage, the availability of replacement parts, and your comfort level with disassembling and reassembling the starter mechanism.

Troubleshooting Malfunctioning Recoil Starters

Sometimes, the issue with starting the leaf blower may not lie with the rewind spring itself but rather with the recoil starter as a whole.

The recoil starter may fail to engage properly with the blower’s engine crankshaft, preventing the engine from starting. This can be caused by various factors, such as worn gears, a damaged pawl mechanism, or a loose connection.

To troubleshoot a malfunctioning recoil starter, follow these steps:

  1. Disconnect the spark plug wire to ensure safety during the inspection and troubleshooting process.
  2. Remove the starter housing cover by unscrewing the fasteners or following the manufacturer’s instructions.
  3. Inspect the recoil starter assembly for any visible signs of damage, such as broken or worn gears, a loose or damaged pawl mechanism, or loose connections.
  4. If you notice any damaged or worn components, determine whether they can be repaired or replaced individually or if the entire recoil starter assembly needs to be replaced.
  5. Follow the manufacturer’s instructions to disassemble and replace any faulty components or the entire recoil starter assembly.
  6. Reassemble the recoil starter, ensuring all components are properly aligned and secured.
  7. Test the leaf blower’s starting mechanism by pulling the starter cord to check for smooth operation and proper engagement with the engine crankshaft.
Ensuring Proper Engagement with the Blower Engine

Crankshaft When reassembling the recoil starter assembly or replacing any components, it is crucial to ensure proper engagement between the starter and the blower’s engine crankshaft.

Improper engagement can lead to starting difficulties or the starter cord not retracting correctly.

Before attempting to start the leaf blower, manually rotate the engine crankshaft a few times to ensure the recoil starter engages smoothly and without any resistance.

If you encounter any resistance or difficulty, double-check the assembly to ensure all components are properly aligned and secured.

By addressing starter assembly and recoil issues, you can overcome starting problems related to the leaf blower’s mechanism.

Whether it’s replacing the rewind spring or the entire recoil starter assembly, troubleshooting and resolving these issues will greatly increase the chances of your leaf blower starting effortlessly.

4. The Spark Arrestor Issues and Fixes

The spark arrestor is a small screen located within the muffler of your leaf blower. Its primary function is to prevent sparks emitted by the engine from exiting the exhaust system, reducing the risk of accidental fires.

However, over time, the spark arrestor can become clogged with soot and debris, obstructing the flow of exhaust gases. A clogged spark arrestor can restrict airflow and lead to starting difficulties or poor engine performance.

Cleaning vs. Replacing the Spark Arrestor

If you suspect that a clogged spark arrestor is causing your leaf blower’s starting issues, it is worth attempting to clean it before considering a replacement. Here’s how you can clean the spark arrestor:

  1. Begin by locating the muffler on your leaf blower. It is typically situated at the rear of the engine, near the exhaust outlet.
  2. Use a screwdriver or appropriate tool to remove the screws or fasteners securing the spark arrestor cover.
  3. Carefully remove the spark arrestor from the muffler. Take note of its orientation for proper reinstallation.
  4. Inspect the spark arrestor for visible signs of clogging, such as soot buildup or debris. A clogged spark arrestor may appear black or grayish in color.
  5. Clean the spark arrestor by using a wire brush or a soft-bristle brush to gently scrub away any accumulated soot or debris. Ensure you clean both sides of the screen thoroughly.
  6. Once cleaned, examine the spark arrestor for any remaining obstructions. If necessary, use compressed air to blow out any stubborn debris.
  7. Reinstall the spark arrestor in the correct orientation, ensuring it is securely fitted into the muffler.
  8. Secure the spark arrestor cover by tightening the screws or fasteners.

If cleaning the spark arrestor does not resolve the issue, or if the spark arrestor is damaged or excessively worn, it may be necessary to replace it. Replacement spark arrestors can typically be purchased from the leaf blower’s manufacturer or authorized dealers.

Regularly inspecting and cleaning the spark arrestor, as well as replacing it when necessary, will help maintain a clear path for exhaust gases, ensuring proper engine function and increasing the chances of a successful start for your leaf blower.

5. Air Filter Problems, Causes Behind and Fixes

The Impact of a Dirty Air Filter on Leaf Blower Performance The air filter in your leaf blower plays a vital role in maintaining clean airflow into the engine.

However, with regular use, the air filter can become clogged with dirt, debris, and other particles.

A dirty air filter restricts the amount of air reaching the carburetor, leading to a rich fuel-to-air mixture and poor engine performance. In some cases, a severely clogged air filter can prevent the leaf blower from starting altogether.

The Importance of Regular Air Filter Replacement

To ensure proper engine function and prevent starting difficulties, it is crucial to inspect and replace the air filter as needed. As a general guideline, it is recommended to replace the air filter annually or whenever it becomes visibly soiled or damaged.

To check the condition of your leaf blower’s air filter, follow these steps:

  1. Locate the air filter housing on your leaf blower. It is typically situated near the carburetor or on the side of the engine.
  2. Remove the air filter cover or housing by unscrewing the fasteners or following the manufacturer’s instructions.
  3. Take out the air filter from the housing and inspect it for dirt, debris, or excessive discoloration.
  4. If the air filter appears dirty or clogged, it is time for a replacement.

When purchasing a new air filter, make sure to obtain the correct filter type and size for your specific leaf blower model. It is advisable to use genuine manufacturer-recommended filters or high-quality aftermarket filters that provide equivalent performance and filtration.

To replace the air filter, follow these steps

  1. Insert the new air filter into the housing, ensuring it fits properly and covers the entire opening.
  2. Replace the air filter cover or housing and secure it with the appropriate fasteners.
  3. Ensure the air filter is properly seated and sealed to prevent the entry of unfiltered air.
How to Fix Leaf Blower Starting Problems

5. Faulty Ignition Coil Issues Causes and Fixes

The ignition coil in your leaf blower is responsible for generating the high voltage needed to create a spark at the spark plug. This spark ignites the air-fuel mixture in the engine cylinder, enabling combustion and starting the engine.

However, if the ignition coil becomes faulty or fails, it can disrupt the spark generation process, leading to starting issues or a complete failure to start.

Using an Ignition Tester to Determine Ignition Coil Failure To diagnose whether the ignition coil is the cause of your leaf blower’s starting problem, you can use an ignition tester. An ignition tester is a simple tool that allows you to check the spark produced by the ignition coil.

To test the ignition coil, follow these steps:

  1. Disconnect the spark plug wire from the spark plug.
  2. Attach the ignition tester to the spark plug wire.
  3. Ground the metal clip of the ignition tester to a metal part of the engine.
  4. Attempt to start the leaf blower by pulling the starter cord or pressing the ignition button.
  5. Observe the ignition tester for a visible spark. A strong and consistent spark indicates a healthy ignition coil, while a weak or no spark suggests a faulty ignition coil that needs to be replaced.
Replacing a Faulty Ignition Coil

If the ignition tester indicates a faulty ignition coil, it is necessary to replace it to restore proper spark generation.

Here’s a general outline of the steps involved in replacing the ignition coil:

  1. Locate the ignition coil on your leaf blower. It is typically situated near the engine’s flywheel or on the engine block.
  2. Disconnect the spark plug wire from the old ignition coil.
  3. Remove any retaining screws or fasteners securing the ignition coil in place.
  4. Carefully disconnect any electrical connectors attached to the ignition coil.
  5. Install the new ignition coil, ensuring it is properly aligned and securely fastened.
  6. Reconnect the spark plug wire to the new ignition coil.
  7. Double-check all connections and ensure there are no loose or disconnected wires.
  8. Test the leaf blower’s starting mechanism to verify that the new ignition coil is functioning correctly.

It’s important to use a compatible replacement ignition coil recommended by the manufacturer to ensure compatibility and optimal performance.

By diagnosing and replacing a faulty ignition coil, you can restore the spark generation process, enhancing the chances of your leaf blower starting smoothly and reliably.

6. Worn Flywheel Key Issues Causes Behind and The Fixes

The flywheel key is a small metal piece that fits into the crankshaft of your leaf blower’s engine.

Its primary purpose is to engage with the flywheel, ensuring proper timing and synchronization between the engine’s rotating components.

The flywheel key is designed to break in the event of sudden resistance or engine malfunction, preventing severe damage to the engine.

Signs of a Worn Flywheel Key and Its Replacement Overtime

The flywheel key may become worn or damaged due to regular use or excessive stress. A worn flywheel key can cause the timing between the crankshaft and the flywheel to be off, leading to starting difficulties or an engine that won’t start at all.

Here are some signs that indicate a worn flywheel key:

  1. Engine misfires: If the flywheel key is worn, it can disrupt the ignition timing, causing the engine to misfire or run erratically.
  2. Difficulty starting: A worn flywheel key can affect the engine’s ability to start smoothly. You may experience resistance or a lack of response when attempting to start the leaf blower.
  3. Engine backfires: Improper timing due to a worn flywheel key can result in engine backfires, causing loud popping noises or even damage to the engine.

To replace a worn flywheel key, follow these steps:

  1. Disconnect the spark plug wire and remove the spark plug from the engine.
  2. Locate the flywheel cover on the top or side of the engine and remove any screws or fasteners holding it in place.
  3. With the flywheel cover removed, locate the flywheel and the crankshaft.
  4. Carefully remove the flywheel by loosening the retaining nut or bolt in the center using an appropriate tool, such as a socket wrench.
  5. Once the flywheel is loose, you should be able to see the old flywheel key seated in the keyway of the crankshaft. Remove the worn key.
  6. Clean the area around the keyway and ensure it is free of debris or residue.
  7. Insert a new flywheel key into the keyway, making sure it fits snugly and aligns with the corresponding slot on the flywheel.
  8. Reinstall the flywheel onto the crankshaft, tightening the retaining nut or bolt securely.
  9. Replace the spark plug and reconnect the spark plug wire.
  10. Test the leaf blower’s starting mechanism to ensure that the new flywheel key allows for proper engine starting and operation.

Prevention and Maintenance

  1. Regularly clean or replace air filter: Clean or replace the air filter regularly to ensure proper airflow to the engine.
  2. Regularly clean or rebuild carburetor: Clean or rebuild the carburetor regularly to ensure proper fuel delivery to the engine.
  3. Replace spark plug at regular intervals: Replace the spark plug at regular intervals as recommended by the manufacturer to ensure proper ignition.
  4. Check fuel levels and freshness regularly: Keep the fuel tank full and ensure the fuel is fresh, adding a fuel stabilizer if needed.
  5. Check and clean exhaust regularly: Check the exhaust regularly and clean it out if necessary to ensure proper exhaust flow.
  6. Check compression regularly: Use a compression tester to check compression in the engine at regular intervals, and address any issues if found.
  7. Store the leaf blower properly: Store the leaf blower in a dry, clean place when not in use to prevent damage from moisture or debris.
  8. Regularly check and lubricate moving parts: Check and lubricate moving parts such as the throttle control, cable, and pulley regularly to ensure smooth operation.
  9. Follow manufacturer’s recommendations: Follow the manufacturer’s recommendations for regular maintenance and troubleshooting to keep your leaf blower in top working condition.
Dirty or clogged air filterClean or replace the air filter
Old or fouled spark plugReplace the spark plug
Dirty or clogged carburetorClean or rebuild the carburetor
Low or no fuelRefill the fuel tank
Faulty ignition coilReplace the ignition coil
Exhaust cloggedClean the exhaust system
Low compressionCheck the compression and repair or replace the engine if needed

Note: This table is not exhaustive and there may be other causes and solutions depending on the specific leaf blower model and problem. Always consult the manufacturer’s manual or a professional for guidance.


How can I tell if my spark plug is worn?

A worn spark plug will typically have a dark, sooty appearance and may have a worn or damaged electrode. You can also test the spark plug using a spark tester to see if it is producing a strong spark.

How often should I clean my leaf blower’s air filter?

The frequency at which you should clean your air filter will depend on the amount of use and the environment in which you are using your leaf blower. A general rule of thumb is to check the air filter after every use and clean or replace it as needed. If you are using your leaf blower in a dusty environment, you may need to clean or replace the air filter more frequently.

What is the best way to clean a clogged carburetor?

The best way to clean a clogged carburetor is to disassemble it and use a small brush and carburetor cleaner to remove any debris or buildup. You can also use compressed air to blow out any debris. However, it’s recommended to refer to the manufacturer’s instructions for specific steps and precautions.

Can I fix a leaf blower that is not getting compression?

If your leaf blower is not getting compression, it may be due to a worn or damaged piston or cylinder. This is typically a more serious issue that will require professional repair or replacement.

Can I use gasoline mixed with oil or should I only use 2-stroke oil for my leaf blower?

It depends on the manufacturer’s instructions, some leaf blowers require a specific oil to be mixed with gasoline, while others only need 2-stroke oil. Be sure to read your leaf blower’s owner’s manual for specific recommendations on fuel and oil types.


Leaf blower starting problems can be caused by a variety of factors such as a dirty air filter, a clogged carburetor, a worn spark plug, or a lack of compression.

It is important to regularly maintain and troubleshoot your leaf blower to prevent these issues from occurring.

By following the tips outlined in this article, you can keep your leaf blower in top working condition and ensure that it starts quickly and easily every time.

Remember to always refer to the manufacturer’s recommendations for specific troubleshooting steps and to seek professional assistance if needed.

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