The sun is shining, the birds are singing, and you’re ready to tackle your lawn, but your trusty lawnmower refuses to cooperate. The dreaded “click” or the deafening silence instead of a roaring engine can be incredibly frustrating. Don’t worry, we’ve all been there! This comprehensive guide will take you through the most common reasons why a lawn mower won’t start after sitting, and provide step-by-step instructions to get your mower back in action. From troubleshooting basic issues to tackling more complex problems, this guide will have you mowing the grass in no time.
In a nutshell, lawnmowers that have been sitting idle for a while can suffer from various issues like old fuel, clogged fuel lines, dead batteries, and even spark plug problems. This article will explore each of these issues and provide solutions to get your mower up and running again.
Fuel Issues: The Most Common Culprit
The most likely culprit for a lawnmower refusing to start is stale fuel. Gasoline is a volatile substance and degrades over time, turning into a gummy residue that can clog fuel lines and injectors. Here’s how to tackle fuel issues:
1. Drain and Replace the Fuel
- Safety First: Always work in a well-ventilated area and wear appropriate safety gear like gloves and eye protection.
- Locate the Fuel Tank: Identify the fuel tank on your mower. Most models have a clear fuel cap.
- Drain the Fuel: With the mower on a level surface, carefully remove the fuel cap. Use a siphon pump or a clean container to drain the old fuel.
- Fill with Fresh Fuel: Once the tank is empty, pour in fresh, high-octane gasoline. Be sure to use gasoline that is less than 30 days old.
- Add Fuel Stabilizer: For extended storage, consider adding a fuel stabilizer to your gasoline. This helps prevent the fuel from degrading.
2. Inspect and Clean the Fuel Lines
- Locate the Fuel Lines: Trace the fuel line from the tank to the carburetor.
- Look for Clogs: Carefully inspect the fuel line for any visible kinks, cracks, or blockages.
- Clean the Lines: If you find debris or a clog, you can attempt to clean the line with compressed air. Be sure to use a clean air source.
3. Clean the Carburetor
- Understand the Carburetor: The carburetor is the heart of the fuel system, mixing air and fuel to create a combustible mixture.
- Remove the Carburetor: The process of removing and cleaning a carburetor varies depending on the mower model. Refer to your owner’s manual for specific instructions.
- Clean Thoroughly: Use a carburetor cleaning kit or compressed air to remove any dirt, debris, or varnish buildup.
Battery Troubles: A Quick Check
If your lawnmower has an electric start, a dead battery is a common reason for failure. Here’s how to troubleshoot battery issues:
1. Check the Battery Terminals
- Corrosion: Check for any corrosion on the battery terminals. This can prevent a good electrical connection.
- Clean the Terminals: Use a wire brush or a solution of baking soda and water to clean the terminals.
2. Check the Battery Voltage
- Use a Voltmeter: Use a multimeter to check the battery voltage. A fully charged battery should read around 12.6 volts.
- Charge or Replace: If the battery is low, charge it or replace it with a new one.
Spark Plug: The Igniter of Your Engine
The spark plug is crucial for igniting the air-fuel mixture. A faulty spark plug can prevent your mower from starting.
1. Inspect the Spark Plug
- Remove the Spark Plug: Use a spark plug socket to remove the spark plug from the engine.
- Check for Damage: Examine the spark plug for any cracks, corrosion, or excessive wear on the electrodes.
- Gap Check: Use a spark plug gap gauge to check the electrode gap. The correct gap will be specified in your mower’s manual.
2. Clean or Replace the Spark Plug
- Cleaning: If the spark plug is dirty, you can clean it with a wire brush.
- Replacement: If the spark plug is damaged or worn, replace it with a new one of the correct type and gap.
Beyond the Basics: More Advanced Troubleshooting
If the basic steps above haven’t solved your starting problems, you may need to delve deeper into the workings of your lawnmower.
1. Check the Air Filter
- Clogged Filter: A clogged air filter can restrict airflow to the engine, causing starting problems.
- Clean or Replace: Remove the air filter and clean it with soap and water or replace it with a new one.
2. Inspect the Engine Oil
- Low Oil: Low oil levels can damage the engine and prevent it from starting.
- Top Up or Change: Check the oil level and top up or change the oil as needed.
3. Examine the Fuel Pump
- Fuel Delivery: The fuel pump delivers fuel from the tank to the carburetor.
- Testing the Pump: You can test the fuel pump by applying pressure to the fuel line. If fuel is delivered, the pump is likely working.
4. Seek Professional Help
If you’ve tried all the basic steps and your mower still won’t start, it’s time to seek professional help. A qualified mechanic can diagnose and repair more complex issues like electrical problems, carburetor adjustments, or engine damage.
Preventative Maintenance for a Smoother Start
Taking care of your lawnmower can prevent future starting problems.
- Regular Maintenance: Perform regular maintenance, including oil changes, air filter cleaning, and spark plug checks.
- Fuel Stabilizer: Always use fuel stabilizer in your gasoline if the mower will be stored for more than 30 days.
- Store Properly: Store the mower in a dry, clean place, with the fuel tank empty.
By following these tips and implementing regular maintenance, you can significantly reduce the chances of your lawnmower refusing to start when you need it most.
FAQs
What are some common reasons why a lawnmower won’t start?
There are several reasons why your lawnmower might be refusing to start. The most common culprits include a lack of fuel, a clogged air filter, a dead battery (for electric mowers), or a faulty spark plug. It’s also possible that the carburetor is clogged, preventing fuel from reaching the engine. If you’ve recently used gasoline, it’s important to check if the fuel is fresh and not stale.
If the fuel is fresh and the air filter is clean, the problem may lie with the spark plug or the carburetor. A spark plug that is fouled or corroded can prevent the engine from igniting. A clogged carburetor will also restrict fuel flow, leading to starting problems. It’s also essential to check the fuel lines for any blockages or leaks.
How do I troubleshoot a lawnmower that won’t start?
Start by checking the basics. Make sure there’s fuel in the tank, and that the fuel valve is open. Check the air filter for dirt and debris, and clean or replace it if necessary. If you have an electric mower, check the battery to ensure it’s charged. If your lawnmower is still refusing to start, move on to more in-depth troubleshooting steps.
The next step is to inspect the spark plug. Remove the spark plug and check its condition. A fouled or corroded spark plug will need to be replaced. While you’re at it, check the spark plug wire to make sure it’s securely connected. You can also try testing the spark plug with a spark plug tester to confirm if it’s generating a spark.
How do I check the spark plug?
You can check the spark plug by removing it from the engine and inspecting its condition. A healthy spark plug should have a clean, light-brown electrode. If the electrode is black, sooty, or covered in oil, it’s likely fouled and needs to be replaced. You can also test the spark plug using a spark plug tester. This device will allow you to see if the spark plug is generating a spark.
If the spark plug is in good condition, you can test it by grounding the spark plug to the engine block and then pulling the starter cord. You should see a spark jump between the electrode and the engine block. If there is no spark, you’ll need to troubleshoot further, potentially focusing on the ignition system.
How do I clean or replace a clogged air filter?
The air filter is a crucial component of your lawnmower’s engine as it prevents dirt and debris from entering the engine and causing damage. A clogged air filter can restrict airflow and cause starting problems. To clean a paper air filter, remove it from the mower and tap it gently against a hard surface to remove loose dirt. You can also use a vacuum cleaner with a brush attachment to remove dirt. If the filter is too dirty or damaged, it’s best to replace it with a new one.
If your lawnmower has a foam air filter, you can clean it using soap and water. Rinse the filter thoroughly and allow it to dry completely before reinstalling it. Remember to replace the air filter regularly to prevent future starting issues.
What do I do if the carburetor is clogged?
A clogged carburetor can prevent fuel from reaching the engine, leading to starting problems. The best way to address this is to clean the carburetor. However, this can be a complex process, requiring specialized tools and knowledge. If you’re not comfortable cleaning the carburetor yourself, it’s best to take your lawnmower to a qualified mechanic for professional cleaning.
Cleaning a carburetor involves removing it from the engine, dismantling it, and soaking the parts in a carburetor cleaner solution. Once the parts are clean, reassemble the carburetor and reinstall it on the engine. After cleaning the carburetor, it’s crucial to adjust the carburetor settings to ensure proper fuel mixture.
How do I check the fuel lines for blockages or leaks?
The fuel lines are responsible for delivering fuel from the tank to the carburetor. If the fuel lines are blocked or leaking, it can prevent fuel from reaching the engine. To check the fuel lines, start by inspecting them visually for any cracks, tears, or kinks. If you find any damage, you’ll need to replace the affected fuel line.
You can also check for blockages by disconnecting the fuel line at the carburetor and blowing through it. If you can’t blow through the line easily, there’s likely a blockage that needs to be addressed. If you notice any leaks, you’ll need to address them promptly to prevent fuel spills and potential safety hazards.
What are some preventative measures to keep my lawnmower running smoothly?
To keep your lawnmower running smoothly and avoid starting problems, it’s important to perform regular maintenance. This includes changing the oil and air filter regularly, cleaning the spark plug, and inspecting the fuel lines for any leaks or blockages.
You should also store your lawnmower properly during the off-season. Empty the fuel tank and add fuel stabilizer to prevent fuel from going stale. Store the mower in a dry place, out of the elements, to prevent corrosion. By following these preventative measures, you can ensure your lawnmower stays in good working order and avoids starting problems.