A lawnmower is essential outdoor equipment to keep the lawn clean and organized. But every so often, it becomes big trouble when it fails to start for several reasons. One example can be the gasoline leakage from the button. Even occasionally, the machine won’t restart when it’s hot. Overall, we need to deal with the mower carefully to solve or avoid the problems.

What shall you do when gas leakage or heat causes the lawnmower starting problem? You should identify the reasons why the device is not working. Replacement or repair can reduce the chances of engine failure. For example, if the gas leaks from the primer button, you may replace the O-ring or gas line or tighten the connections.

As it’s a matter of time, money, and labor, you should be skeptical about the roots of the current problem. You may treat it accordingly when you find the main cause of the lawnmower stopping working. If you cannot solve it yourself, ask the experts or contact the technical person to give life to the lawnmower again.

Now, I request you read the whole post to find out why the problem occurs and how to solve it in a lawn riding mower.

Problem #1

My Lawnmower is Leaking Gas from Primer Button

The primer button on a lawnmower is a small, round button used to prime the engine. This button is typically located near the spark plug on the lawnmower. Hence, many of us know this primer button as the primer bulb. There is no primer button for the simpler started lever in most modern lawnmowers. But older models have this button to help in the cranking process.

Unfortunately, the primer button gets damaged due to overexposure. It leads to gas leaking, resulting in the engine failing to start or work actively. This part of the article teaches the reasons and solutions for gasoline leakage from the primer button.

The Reasons & Solutions

Suppose you are experiencing gas leakage from the primer button on a lawnmower. You should act wisely and immediately to reduce the risks of getting further issues. After all, gas leaks can be hazardous as gas is highly combustible. If you leave it unchecked, severe damage or even explosions can happen.

Many things are there to cause the gas leak. So, it's essential to troubleshoot and figure out the problem.

First, find out any cracks or damages available on the primer button. If you can find it, you must replace it with a new one.

The lousy seal between the primer bulb and carburetor can be another reason. This seal degrades over time and penetrates gasoline to the outside. If it happens, you can repair the seal with a suitable sealant.

If the gas tank is not sealed correctly, the problem may occur. The ineffective seal happens due to the old or poor installation of the gas tank. If this is the reason for your mower starting failure, call the experts soon.

Finally, the fuel line may be leaking. A fuel filter or pump problem can cause fuel line leakages. In this case, you should contact the professional.

Gas leaks are serious business. So, it's vital to take care of them right away. By troubleshooting the problem and taking the appropriate action, you can prevent further damage or danger.

Can I Start Lawnmower without an Active Primer Button?

Yes, you can start the mower without an active primer button. Here are the processes:

Make sure you have turned off the engine first.

Then, locate the spark plug and unscrew it.

Next, use a wire brush to clean the spark plug.

Once the spark plug is clean, screw it back in.

Now, pull the cord to start the engine.

Once the engine is running, push the primer button a few times.

Following these steps will help to keep the engine going. Once the engine runs, you can release the primer button and continue mowing your lawn.

Problem #2

Lawnmower Won’t Start After Replacing Head Gasket

A blown gasket can cause the lawnmower to stop working. Most experts suggest replacing the head gasket with a new one when it happens. Then again, there can be a chance of lawnmower starting problem after replacing it. Below are the ways to handle the situation:

The Reasons & Solutions

Mostly, it happens for the installation of an incompatible or defective head gasket. If you find it in this condition, you should look for a brand-new head gasket. Or, at least you should know which model or size works well with your lawnmower.

Another reason can be the improper installation of the replacement head gasket. Check everything Properly, like the seating of the gasket. Also, tighten everything acceptably to prevent any further leaks.

If the placement of the parts is fine, but the problem still occurs, you may need to replace the cylinder head.

Sometimes a damaged or faulty spark plug resists the lawnmower from starting after replacing the head gasket. The faulty spark plug fails to fire in a regular pattern in such a case. If this is the reason, you should inspect the gap on the spark plug. Also, ensure the fuel line is free of clogging.

Pre-ignition is another reason why the lawnmower fails to restart after replacing the head gasket. Usually, excessive combustion in a single-engine cycle causes the cylinder head to achieve more pressure inside. It leads the engine to work undesirably, fouling the head gasket performance.

Coolant leakages from rusted piping can cause lawnmower head gasket failure. This leakage increases the regular engine temperature that the head gasket cannot control. So, ensure there are no possible coolant leakages.

Problem #3

Lawnmower Won’t Restart when Hot

Lots of problems appear when the lawnmower fails to restart. Mainly, it is common to get failure of garden mower restart when hot. You may think of filling the gasoline tank fully and expect the engine works fine. But things are not like these. Below are some reasons and solutions to make the riding mower work again actively:

The Reasons & Solutions

Overheated engines may happen due to scorching hot weather. But there are also other reasons why the engine gets overheated. For example, clogged cooling fins or mufflers can precast into the engine block. Again, the plastic housing on top of the device may trap dirt that leads to an engine stop. Sometimes, an off-beam plug or fuel can harm the fins. Remove the plastic housing to solve all these problems.

Air leakages of the engine can increase the engine temperature. They become larger gradually when you run the engine for a long time. Again, any loose bolt can create leaks to the engine. So, you should seal the machine by tightening the bolts properly.

The spark plug length is essential to keep the engine running. This length ensures the correct combustion of the air-gasoline mixture. Also, it keeps the gap between the dual electrodes of the spark plug. Change the spark plug, the condenser, or the ignition coil to solve the problem if it appears.

The carburetor choke opens when you turn on the engine. A malfunctioned carburetor cannot open the choke, which leads to engine flood. So, you should always clean the carburetor or use a solenoid to keep the choke working correctly.

Fill the gasoline tank if you find the fuel level lower than recommended. Low fuel can decrease the lifespan of the engine. You should use top-quality 5w30 or 10w30 gasoline suggested by experts for a better result.

Batteries can get excessive acid buildups. It eventually shortens the battery life. Therefore, the fitness test of the battery, correct pole placement and battery replacement can solve the issues.

Defective battery connections can turn over the engine but fail to start. Yet again, loose connections can make the mower vibrate a lot. When these happen, you should tighten the connections properly. Then, replace the rusted cables. You may also use sandpaper to prevent buildup on the battery connections.

Solenoid enables engine cranking when you hold the mower key correctly. A solenoid failure creates the engine click sound without turning it on. Consequently, find the solenoid and solve the errors by disconnecting the battery.

A jammed binding started motor can be another reason for lawnmower failure to start when hot. If you find the motor jammed, turn off the engine with your hand in an anti-clockwise motion. You may also rotate the crankshaft with a ratchet and a socket. Lastly, spray WD40 on the starter gear head to see the magic.

Maybe there is no oil cooler in your gear. Installing a lawnmower oil cooler can solve the troubles and increase the engine lifetime.


A lawnmower is a handy machine to make our life beautiful. As discussed in this article, being a technical device, it can often face problems. If your garden mower is defective due to gas leakage or high temperature, you may follow the steps I have mentioned above. Still, if you fail to find the answer, you can call the local professionals. After all, they are ready to welcome you and make things tiptop.