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Why lawn mower starts then stops?

Why lawn mower starts then stops?
Why lawn mower starts then stops?

If you own a lawn mower, you may be having trouble starting it, or even shutting it off. This can be frustrating, but luckily, there are a few easy fixes you can try before calling a repairman. In this blog post, I’ll explore some common reasons why lawn mower starts and then stops. Keep reading to learn more!

Starting a lawn mower and having it stop shortly afterward can be a very frustrating experience. Luckily, there are a few potential problems that can cause this and with the right diagnosis and repair, you can get your lawn mower up and running again. The following are some potential problems and solutions associated with lawnmowers that start and then stop.

The first possible issue is that the lawn mower is out of fuel. If your mower will not stay running, it could be due to a lack of fuel, or a stale fuel supply. To check for fuel, simply open the gas tank and make sure there is gasoline inside. If there is gasoline in the tank, it is possible that it has gone stale. To fix this, you can drain the gas tank and refill it with fresh fuel.

Another potential issue is a clogged carburetor or air filter. The carburetor and air filter of your lawn mower control the fuel and airflow to the engine. If either one of these components is clogged, it can restrict the fuel and air, causing the mower to cut out. To check if this is the issue, remove the air filter and carburetor and clean them with a carburetor cleaner.

The spark plug of your mower could also be the source of the problem. If the spark plug becomes fouled or worn out, it can prevent the engine from starting or running. To check if this is the issue, remove the spark plug and inspect it for signs of wear or dirt. If it looks worn out or dirty, you will need to replace it with a new spark plug.

Finally, your mower may be having issues with the ignition system. If the ignition system is not working properly, it can prevent the engine from starting or running. To check if this is the issue, you can use a multimeter to test the ignition system and check for any problems. If there are any faulty components, you will need to replace them.

By carefully diagnosing and repairing any of the above issues, you should be able to get your lawn mower back up and running.

Page Contents

Overview of Common Causes of LawnMowers Starting and Then Stopping

Lawnmowers can be one of the most frustrating pieces of outdoor machinery to troubleshoot. While it’s common for lawnmowers to start and then stop, there are multiple reasons why this may be occurring. The three most common causes of lawnmowers starting and then stopping are clogged air filters, improper fuel mixtures, and a dead battery.

Air filters are one of the most common reasons why a lawn mower may start and then stop. Air filters are responsible for supplying clean air to the engine, and when they become clogged, the engine will not be able to receive enough air and will shut off prematurely. In order to fix this issue, the air filter should be checked and replaced regularly.

Improper fuel mixtures are another common cause of lawnmowers starting and then stopping. If the fuel mixture is too rich or too lean, the engine will be unable to start or will run poorly and eventually shut off. To prevent this issue, it is important to use fresh, high-octane gasoline and to use a fuel stabilizer in order to prevent the gasoline from becoming stale or contaminated.

Finally, a dead battery can also cause a lawn mower to start and then stop. If a battery has gone dead or is not supplying enough power to the engine, the engine may start and then quickly shut off. To prevent this, it is important to check the battery regularly and replace it as needed.

In conclusion, the three most common causes of lawnmowers starting and then stopping are clogged air filters, improper fuel mixtures, and a dead battery. By understanding these common causes and taking the necessary steps to prevent them, you can ensure that your lawn mower will run smoothly and reliably.

Primer Bulb Troubles

Have you ever encountered a problem when your lawn mower starts up, only to stop shortly afterward? This is a common issue that is usually attributed to a malfunctioning primer bulb. The primer bulb is an important part of the lawn mower’s fuel system, as it helps to draw fuel up to the carburetor. When this small but important part is not functioning correctly, the lawn mower will be unable to pull in enough fuel, resulting in its eventual shutdown.

To diagnose a primer bulb that is not working correctly, it is important to first understand the operation of the lawn mower’s fuel system. The primer bulb is usually located near the carburetor and is connected to the fuel system via a fuel line. The operation of the bulb is simple: when it is pushed down, it draws fuel from the tank and sends it up to the carburetor. If the bulb does not compress correctly, then the fuel will not be sent up to the carburetor, resulting in the lawn mower’s eventual shutdown.

A malfunctioning primer bulb can easily be identified by inspecting the fuel lines for any signs of clogs or other obstructions. Additionally, the bulb itself should be inspected for any cracks or other damage. If it is found to be damaged, it should be replaced immediately with a compatible part. If there are no signs of damage, the bulb may simply need to be cleaned or adjusted. Either way, it is important to ensure that the primer bulb is functioning correctly so that your lawn mower can operate properly.

Clogged Air Filter

If your lawn mower starts and then stops shortly after, it could be due to a clogged air filter. The air filter is an important component of a lawn mower because it helps to keep dirt and debris out of the engine. When the air filter is clogged, it prevents air from flowing freely into the engine, causing it to start then stall shortly after. To check for a clogged air filter, you can remove it and inspect it for damage or blockages. If the air filter is clogged, you will need to replace it with a clean one.

It is also important to keep your air filter clean. This can be done by cleaning it with a soft brush and soapy water. You can also use compressed air to blow out any dirt or debris that may be stuck in the filter. If your air filter is particularly dirty, you may need to replace it. In addition, you should check the air filter regularly to ensure that it is not clogged.

A clogged air filter can be a common cause of lawnmowers starting and then stopping. If your lawn mower has this issue, you should inspect the air filter for dirt, debris, or blockages. Cleaning or replacing the air filter may help to solve the issue. Be sure to check the air filter regularly to prevent the issue from recurring.

Clogged Fuel Filter

If your lawn mower starts up and then stops without warning, it could be due to a clogged fuel filter. The fuel filter’s job is to remove any contaminants from the fuel before it reaches the engine, and can become clogged over time. This can cause a restriction in the fuel flow, resulting in decreased engine performance and the mower stopping suddenly. To check the fuel filter, remove it from the mower and inspect for any signs of dirt, debris, or blockage. If it looks clogged, replace it with a new one. Additionally, it may be worth checking the fuel line for any kinks or blockages that could be causing the restriction.

Inspecting and replacing the fuel filter is not a difficult job, and can help to ensure that the fuel is getting to the engine without any issues. It can also help to prevent any further problems down the line, as clogged fuel filters can lead to issues with the spark plug, engine, and other parts. Additionally, it’s a good idea to use fresh, clean fuel when refilling the mower, as old and dirty fuel can quickly clog the filter and cause the mower to start and stop unexpectedly.

Regular maintenance of the fuel filter is essential for a healthy lawn mower. Taking the time to inspect and replace the fuel filter when needed can help to avoid any further issues, and will help to keep the engine running smoothly.

Dirty Carburetor

A dirty carburetor is one of the most common causes of a lawn mower that starts and then stops. If a carburetor is not clean and working properly, the fuel will not be able to flow properly through the system, resulting in the lawn mower having difficulty starting and staying running. The carburetor is responsible for mixing the proper ratio of air and fuel to the engine, and if it becomes dirty or filled with debris, it can cause the engine to misfire or become clogged, resulting in the engine not having enough fuel to run properly.

To clean a dirty carburetor, first, remove the air filter and spark plug. Once these items have been removed, the carburetor can be removed from the engine. Once the carburetor is removed, use a carburetor cleaner to clean the parts. Make sure to get into all of the small crevices and openings in the carburetor to remove any buildup of dirt and debris. After the carburetor has been cleaned, make sure to reassemble the parts and reattach them to the engine.

If a dirty carburetor is not the issue, other causes for a lawn mower that starts then stops could include a bad spark plug, a clogged air filter, or an issue with the fuel system. If the carburetor has been cleaned and the issue persists, it is important to inspect the other components to ensure that they are working properly. If all of the components are in good condition, it could be a sign that the engine is in need of a tune-up or repair. It is important to take the lawn mower to a qualified technician for inspection and repair if necessary.

Faulty Ignition Coil

One of the most common reasons why a lawn mower starts and then stops is a faulty ignition coil. The ignition coil is a vital component of the engine’s ignition system and is responsible for transmitting the high-voltage spark needed to ignite the fuel and air mixture in the engine. If the ignition coil fails, it can cause the engine to start and then immediately stop, with little or no sign of running. In some cases, the engine may run but will be very inconsistent and lack power.

In order to test the ignition coil, use an ohmmeter or multimeter to measure the resistance across the primary and secondary windings of the coil. If the reading is too low or too high, then it is likely that the ignition coil has gone bad and needs to be replaced. Additionally, the spark plug should be checked for proper operation and replaced if necessary. If the spark plug and coil are both functioning correctly, then other components of the ignition system such as the spark plug wire, flywheel, and rotor may be the cause of the no-start condition.

When diagnosing and repairing a faulty ignition coil, it is important to use the appropriate tools and follow the manufacturer’s instructions. Maintaining proper engine operation can be difficult if the ignition system is not functioning properly and should not be attempted by the inexperienced. Professional help may be needed in some cases in order to ensure the safe and reliable operation of the lawn mower.

Faulty Fuel Pump

If your lawn mower starts and then stops, it could be a sign that you have a faulty fuel pump. The fuel pump is responsible for pushing fuel from the gas tank to the carburetor or fuel injection system, and if it is not working correctly, it can cause the engine to start and then die.

In order to determine whether or not the fuel pump is the problem, you should first check the fuel line and filter. If they are clogged or damaged, they should be replaced. If the lines and filter are in good condition, then you should check the fuel pump itself. If the pump is not functioning properly, it can cause the engine to start and then stop. You can test the fuel pump by disconnecting the fuel line from the pump and running the mower, if it runs but then dies, then the pump is likely the source of the issue.

Replacing a faulty fuel pump is usually a relatively simple repair. You will need to make sure to purchase a new pump that is compatible with your lawn mower make and model, as well as the correct fuel line size. Once you have the new pump, you can simply disconnect the old one and install the new one, making sure to properly connect the fuel lines and filter.

Conclusion

The issue of why a lawn mower starts and then stops is a common one and is often caused by a number of different problems. From air filters that need to be changed, to fuel problems, to spark plug issues, it is important to identify the underlying cause of why your lawn mower is starting then stopping so that you can resolve the problem and get your lawn mower back up and running. Taking the time to properly diagnose and repair the issue can save you a significant amount of money and time in the long run.