How To Fix A Smoking Lawn Mower? – Troubleshoot Engine Smoke. Lawn mower engine smoking

Lawn Tractor Stopped on Hill now smoking

My neighbor borrowed my lawn tractor and stopped on a hill and now the tractor is blowing out large amounts of white smoke. I did an oil change after to try and see if that stopped the smoking but to no avail. Any thoughts on what could be or how to repair? My father in law says to just let it burn off but wanted to get another set of opinions and post a video below

White smoke is caused by oil burning. I recommend checking the oil level. If the oil were over filled, it would cause the engine to smoke. Once you have the oil level set to the proper level check the air filter. If the engine was over filled with oil, it could have soaked the paper air filter with oil. If the air filter is soaked in oil or dirty, you need to replace it. Before installing the air filter start the mower and let it run for a few minutes. This should clear all of the oil out of the carburetor and muffler. The mower should be done smoking at this point. If the smoking has stopped, reinstall the air filter. The mower should be back to normal.

I have had this happen, it is probably a flooded carburetor/excessive gas. The slope/angle of the hill can cause your float in the carburetor to be at an odd angle and to work how it was designed to (on a level surface) and with extended use, it will let more gas in than normal.

you could try draining the carburetor bowl, normally there is a small access/purging screw that you would use for winterizing it to drain the gas from the carb.

Your neighbor stopped on a hill and what? Did he stop because all of a sudden the motor started smoking? Did it start running funny all of a sudden? Never saw any smoke before? Did you change the oil over on the hill or drive it back to a flat area, and if so does it run OK, or does it have less power? Has the amount of smoke changed? How long have you run it while smoking? 1 minute, 10 minutes, 30 minutes? Still smoking?

Yes, white smoke is from burning oil. Did your neighbor put 2 stroke mix in it by mistake? Change the gas.

You said you changed the oil, I assume on a level surface, and I assume you know how much to add and how to check it. What did the oil look like that you drained? Did you drain it into a clean pan and look for bits of metal? Why not?

Again, I assume you changed the oil on a level surface, because otherwise you’d overfill it which would splash too much oil on the cylinder from the crankcase, which might get past the rings and smoke. Check the oil on a level surface.

It doesn’t sound bad, but the video has it running pretty fast. Does it idle smoothly. A quick check for worn or broken rings and or worn valve guides is a compression test. pretty easy on a small engine. If that rules out something broken, and the oil level is correct, it should burn off.

How To Fix A Smoking Lawn Mower? – Troubleshoot Engine Smoke

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Noticing smoke from your engine is definitely not a good sign. This is especially so if you don’t know how to fix a smoking lawn mower. Blue or white smoke may indicate that oil is being burnt along with too much fuel.

When it comes to black smoke, it means that the engine is running rich, and the carburetor isn’t getting enough air due to a dirty or clogged air filter. But relax, here’s how to identify the issue without the help of a professional.

Among the three colored smoke, your mower may create white or blue smoke- the most common. It will most of the time go away on its own after a while from running until the smoke clears out. It’s a sign that your lawnmower’s engine is burning oil, which is the main reason.

This can result due to any of the following reasons :

– Tipping your mower on its side or using it at a steep slope

If you tip your lawnmower the wrong way so you can take a look under the deck or replace the blades, it can cause the engine oil to make its way into the cylinder and start burning.

Also, you might have used it at a surface or angle that is too steep. Both of these situations may happen in the bottle filling up with oil and white or blue smoke produced from the exhaust.

What To Do

If your mower has begun smoking after being tipped over, you can get rid of the white smoke by only letting the mower run on idle until the spilled oil clears.

Similarly, it is best to evade using your mower at a surface with a slope of more than 15 degrees. Check your owner’s guidebook to find the best way to reduce the risk of oil leaks if you frequently tip the mower for cleaning or maintenance.

– Overfilling the engine with oil

Lawnmower engines usually require a little over half a quart, so sometimes it’s easy to overfill them. While a lawnmower engine with less than an average amount of oil is going to face a lot of friction. On the other hand, a mower with too much fat will start leaking, and when the engine gets hot, it will exhibit smoke as the oil burns.

So ensure you didn’t overfill the mower by checking the oil level with the dipstick located in the reservoir. I wrote a small guide down below – shows you how to check and change your lawnmower’s oil.

What To Do

Simply lift the dipstick cap, wipe off the stick with scrap, and reinsert it into the reservoir. Then raise the dipstick once again and determine the oil level depending on the recommended “fill” line on the stick.

If the level is very high, pour the oil, then refill the reservoir with it. Keep on adding small amounts of oil until the scale matches the recommended “fill” line.

– Damaged head gasket

A damaged head gasket is much less likely, but it will produce lots of smoke. Unlike previous solutions, this would be a cause of worry or require you to do a severe repair.

It is a metal seal used to keep the engine locked off, located between the cylinder head and the cylinder block of an engine. Its role is to seal the combustion chamber. If your lawnmower has a cracked head gasket, then the smoke won’t disappear if you pour the mower for a while as it does if it’s tipped on the side or overfilled with engine oil.

When it is not sealing the cylinder head well, oil can leak into it from the crankcase and start burning. You can also hear the noise of smoke being blown from the leaking gasket and loss of compression, which generates low power output from the mower.

What To Do

Head gasket is found in the OHV engine, and if it is damaged or starts leaking, the only way you can fix it is by placing a new head gasket in.

First, you will have to remove the sparkplug wire and remove the bolts that contain the cylinder head over the engine block using a socket.

Then, You will find the damaged gasket on the engine block where the cylinder head connects. Take it off and use a tool to scrape off any hard to remove debris, but be careful not to break the smooth surface when scraping off the pieces.

Finally, place the new gasket on the engine block. Place the cylinder head back in position before bolting it back onto the cylinder head and putting the sparkplug wire on the sparkplug.

– Failed piston rings

A damaged piston ring is probably the worst one of all the previous reasons. It is typically seen in older worn out lawnmowers or if the mower is poorly controlled. When these piston rings crack, there is nothing to hold the engine oil from accessing the combustion chamber. They may get damaged due to :

A dirty or worn out air filter may let dust and other shreds stuck in the combustion chamber and harm the piston rings.

Not replacing the engine oil on time will cause inadequate lubrication and damage the piston rings.

What To Do

Failed or worn piston rings are the end, sadly it requires a complete engine rebuild. It is best installing a new engine – a cheaper option, and it comes with a guarantee.

A lawn mower engine will blow black smoke when the fuel and air mixture are too rich. It’s an indication that there isn’t sufficient air, combustion is incomplete, and the unburnt fuel in the combustion chamber converts to smoke. This can happen to your machine due to the following reasons:

– Choke Stuck On

When you light a mower, the choke closes so that the carburetor sends a frequent gasoline mixture to the cylinder. Once then motor starts, the choke opens since that rich mixture is no longer necessary to keep the engine running. If the choke sticks, it declines to open, and the gas mixture continues to be too oily.

What To Do

Check any linkages to the choke to make sure they are running correctly, and the choke is free of dirt and debris.

– Blocked Air Filter

Another reason for faulty air in the combustion chamber is a dirty air filter. When the filter gets clogged or dirty, it prevents sufficient airflow into the carburetor. So it cannot pull in the required volume of air, which makes the mix too productive.

What To Do

– Faulty Carburetor

Small motor carburetors have either two or three adjustment pins — one is for adjusting the idle speed. The other one is for adjusting the fuel mixture ratio. Inside the carburetor pot, a float rises and falls with the quantity of gasoline in the carburetor. If the float is sticking or has revealed a hole, it cannot regulate how much gas enters the carburetor.

When the engine generates black smoke, it could be because the low-speed screw – marked ‘L’ on the majority of mowers – is open too far.

What To Do

Locate the carburetor’s adjustment screws, which are usually under the air filter, and use the low-speed screw 1/4 to 1/2 turn clockwise with a screwdriver to produce a leaner fuel mixture. When you precisely adjust it, you’ll probably notice that the mower’s engine sounds better because it’s blazing fuel more efficiently.

How to check and change your lawn mower oil?

When To Change The Oil?

When you buy a new lawn mower, one of the primary questions is how often you have to change the oil. In general, every model comes with a guidebook where you can tell the most specific timing for this plot.

It can also help you how to fix your smoking lawnmower. Still, I can tell you that most of them need the oil to change after every 20 to 50 hours of work on average. Don’t forget to replace the oil in a new lawnmower engine after the first five hours of working.

Another thing, check the oil every time you use it. Harsh conditions such as wet grass, heavy dust, high temperatures, and rough or hilly terrain, may increase the frequency of needed oil changes.

How to Check Oil Level?

It is a shared problem that users will accidentally put in too little (or too much) engine oil. If they then try to start the mower, the engine can seize. And if you’ve just bought a new lawnmower, this will be absolutely disturbing.

Step 1

Clean the area around the fill tube cap with a rag. This stops dirt and grime from getting inside the crankcase when you lift the mower’s fill tube cap.

Step 2

Remove the cap from the fill tube. The dipstick connects to the bottom of the lid. Wipe it with a clean rag.

Step 3

Enter the dipstick back into the fill tube, and turn the cap clockwise. Check where the oil comes up to. The standard should be near the upper hole or fill line on the dipstick.

Step 4

Too much or too limited oil can cause significant damage to the engine. If needed, top up your oil to the correct level and then recheck using the dipstick. Once the level is perfect, replace the dipstick and tighten. Now you can operate your mower.

1 ) Prepare For The Oil Change

Before discarding the oil from your unit, you need to warm up the engine for at least 15 minutes. Clean around the oil fill area to remove all dirty debris. After that, you will need a pot or any other container to catch the old oil extracted from your mower.

2) Draining The Oil

If your lawnmower has a drain plug, you just need to move and drain it. Otherwise, remove the plastic oil fill cap, lean the mower on one side carefully, and completely drip out into the mower’s container.

3) Replace The Oil Filter

Most of the walk-behind cord mowers don’t have oil filters at all. If your model is one of those with this filter, you should change it while replacing the oil.

4) Refill The Oil

Now, you can spill in the new, clean oil. Read your operator’s manual to select the best oil for your engine type.


In case the previous steps couldn’t ease how to fix a smoking lawnmower, it might have a more severe problem and require professional help.

If your mower is still under warranty, consult with the manufacturer for the nearest servicing mechanic, or poor workmanship that may garner free repairs. If your mower is not included under warranty, a decent small-engine repair shop should also be enough to get the job done.

Lawn mower engine smoking

I’m assuming that you were trying to use the drain plug at the bottom of the engine, not where the oil is added. Draining is done most effectively when the plug on the bottom is removed and the mower is placed level again, over a catch basin and left to sit.

Oil has gotten into the combustion chamber area. The muffler (if it now contains oil) can be washed (flushed out) in a safe solvent, and allowed to dry.

When tipping a vertical shaft engine to get to the drain plug, keep the sparkplug end of the engine higher than the rest of the engine. and follow the safety precautions.

Tipping the crankcase end up will put oil at the combustion chamber end of the engine, and seep into the combustion chamber. and sometimes through the crankcase passage into the carburetor area. In cases where a lot of oil gets into the combustion area. the engine might not rotate (due to a hydraulic lock), until the oil has returned to the crankcase.

If this should happen. allow the engine to sit for an hour or so, with the sparkplug end elevated, and most of the oil will return to the crankcase.

If the air/fuel intake area has become flooded with oil, you might need to have the engine serviced. the carburetor might need to be removed to evacuate the oil from that area.

When the oil gets into the combustion area, the sparkplug is usually soaked. and after cleaning or replacement, the engine will smoke (for a short time) like a fog machine. This will often foul the plug again, and create a lot of carbon in the combustion area. There isn’t an effective way of removing the excess carbon aside from removing the cylinder head. For an old mower, that might not matter much. for a new one that you’d like to get years of trouble-free service from, you might want to consider having the head removed and the oil carbon cleaned out.

Lawn Mower Smoking: Reasons Why How To Fix Them

It can be an alarming sight when you fire up your mower and instead of running smoothly, it starts billowing smoke – especially if it starts sputtering and stalling too. While it’s understandable that your immediate reaction may be to panic, very often the source of a smoking lawn mower or engine is an innocuous issue that will go away on its own or with a simple DIY fix.

When assessing the severity of a smoking lawn mower, the clue is in the color of the smoke. In the majority of cases, a lawn mower smoking white or blue smoke will stop producing the smoke on its own after you let it run for a few minutes. However, if the smoke continues to billow out of your mower and you notice other telltale signs that the mower’s engine isn’t running the way that it should, you may need to address the issue yourself or have it repaired by professionals. A lawn mower smoking black smoke is also a cause for concern and indicates there’s an issue with the inner workings of your mower.

Read on to learn more about the different causes of a lawn mower smoking white, blue, or black smoke, along with step-by-step guides on how to fix each issue at the source.

Before following these troubleshooting tips, make sure you’re using the right technique to start your lawn mower by referring to our guide: How to Start a Lawn Mower.

Why is My Lawn Mower Smoking White Smoke?

Oil Spilled on the Engine

Mower oil spilled onto the engine can be a cause of the lawn mower smoking white smoke. If you notice your mower smoking after adding oil, you may have accidentally spilled some of the oil onto the engine’s housing. Oil may also inadvertently spill onto the engine if you’ve been mowing on a slope steeper than 15 degrees, or if you’ve tipped the mower onto its side for any reason.

How to Fix an Oil Spill on the Mower’s Engine

The smoke may appear alarming, but this issue is relatively minor and is easily fixed using the steps below.

Simply restart the mower’s engine and allow the spilled oil to burn off.

Wait until white smoke stops

If the white smoke doesn’t completely dissipate after about 15 minutes of running the mower, it’s an indication that there may be a bigger issue that needs to be addressed. If this is the case, see the following sections where we have gone through the next steps you should take towards identifying and solving other potential causes.

Oil in the Fuel of a 4 Stroke Mower

If you don’t own a 4 stroke mower then you can skip this section. In the case that you do have a 4 stroke mower, it may be smoking white smoke due to oil mixing in with its fuel. Many up-to-date lawn mower models come with a 4 stroke engine, as they are more reliable and tend to have a longer lifespan than 2 stroke engines do. Not only are they more reliable, 4 stroke engines require less maintenance than their 2 stroke counterparts, and don’t require oil to be mixed in with its fuel. If you put fuel that has been mixed with oil into a 4 stroke mower engine, then the mower will burn the oil which causes it to smoke white smoke. If you continue to run the engine of a 4 stroke mower when there’s engine oil in the fuel tank, it may lead to the engine becoming damaged and prematurely worn out.

How to Remove Oily Fuel from a 4 Stroke Mower

You should take care to avoid draining the fuel out of the mower by tipping it, as this can cause engine oil to spill into the carburetor or cylinder.

Locate the fuel line, which is the part that exits the fuel tank responsible for feeding fuel into the mower’s engine.

Undo the clip on the fuel tank that’s holding the fuel line in place and pull the fuel line off. Alternatively, you could follow the fuel line to where the shut-off valve is located and remove the line at the point at which it connects with the valve. The shut-off valve is a small switch that enables the user to control the flow of fuel to the engine, and is easy to spot around the base of the fuel tank. Be aware that when you complete this step, fuel will start pouring out of the tank.

Drain fuel from fuel tank and collect it in appropriate container

After you remove the fuel line, fuel will start pouring from the fuel tank. Use an appropriate container such as a metal pan to collect it and prevent it from spilling everywhere. Spilt gasoline is not only a nuisance, but also a serious fire hazard, so make sure to clean up any liquid that you don’t manage to contain.

Drain fuel from carburetor

As you drain the fuel from the fuel tank, find the carburetor on your mower to drain the fuel from it as well. Underneath the carburetor you will find the carburetor bowl, which has a small screw or nut located on the side or bottom of the bowl that can be tweaked to empty it out. Loosen the screw or nut and allow the fuel to drain out of the carburetor into your container.

Wash fuel tank if necessary

This step is unnecessary if you can’t see any oil stuck to the inside of the mower’s fuel tank. If you do, then you will need to remove the tank from the mower completely and give it a deeper clean with dishwashing liquid. Pour dishwashing liquid into the fuel tank and give it a good shake to remove the oil from the inside of the tank. You can then clean the carburetor using a can of carburetor cleaner.

Overfilled Oil Reservoir

If your lawn mower is leaking oil and smoking white smoke, you may have accidentally overfilled the crankcase. Lawn mowers suffer from having too much oil as much as they do from having too little. An excess of oil in the reservoir can spill into the engine’s cylinder and start burning with the fuel, which can cause white smoke to come from the mower’s exhaust and oil to start leaking from the muffler. Excess oil in the mower can also leak onto the housing of the engine, which causes the mower to smoke white smoke when the engine heats up and burns it off. In addition to creating the white smoke, the excess oil may also drown the mower’s crankset, impeding its motion. If the mower’s engine won’t start, or takes a much longer time than normal to start and you find that it’s difficult to idle it, these are telltale signs that the combustion chamber is burning oil.

How to Fix Prevent an Overfilled Oil Reservoir

It varies between models, but generally speaking, lawn mowers take just over a pound of oil. This isn’t very much, which is why it’s common to accidentally overfill the oil reservoir. Check the manual for your mower to find out the exact recommended amount of oil for your model.

Check current level of oil

Use the dipstick to check whether the oil level is within the indicated amount marked on the stick. If it shows that there’s an excess amount of oil in the engine, follow the next steps to fix it. You may need to seek the help of professionals if the oil is present in unmanageable amounts.

Remove the excess oil by draining it out of the engine. Tilt the lawn mower onto its side so that the carburetor is facing upwards in order to prevent oil from spilling into the combustion chamber. Let the oil run out of the mower into an appropriate container, and clean up any oil that spills onto other parts of the mower. Dispose of the excess oil appropriately. Finally, change the oil filter.

Check new level of oil is adequate

Use the dipstick to ensure that the new level of oil is within the recommended amount. Run the mower and wait until the white smoke dies down. If it doesn’t, refer to the next section.

Why is My Lawn Mower Smoking Blue Smoke?

For the most part, a lawn mower smoking blue smoke is likely to be suffering from one of the issues known to cause white smoke – read through the previous sections to find out more about the potential causes of blue or white smoke. Other possible reasons why your lawn mower is smoking blue smoke can be due to the use of the wrong oil grade, or if you have over-tilted the lawn mower when mowing on a slope.

Dirty or Worn Out Air Filter

Dirty or worn out air filters are a common cause of lawn mowers smoking black smoke. The air filter in your mower ensures that the air flowing to mix with the gas is clean and free of contaminants such as dirt, dust, and leaves, which would potentially damage the mower’s engine. When the air filter becomes dirty or worn out over time, airflow is restricted and the combustion mix becomes too gas-rich due to the reduced amounts of oxygen. This can cause black smoke to pour out of the mower’s muffler, and may also cause the mower engine to stall after a few minutes of use.

How to Clean an Air Filter

We’ve provided some rough guidance below on how to clean an air filter, but you can refer to your mower’s manual to know the exact instructions for your model. If the filter is severely clogged, it may be easier to just replace the part entirely.

Clean light dirt with compressed air

As air filters are made from a sturdy and porous material, you can use a can of compressed air like the Innovera Compressed Air Cleaner to clean out light amounts of dirt.

Clean heavy dirt with lukewarm water water and dish soap

If the air filter is severely clogged and needs more of a deep clean, you can remove it completely from the mower and hand wash it. Fill a bowl with lukewarm water and dish soap, and remove as much of the debris as possible. Let the filter air dry and then replace it in the lawn mower.

Run the engine and check for smoke

Run your mower’s engine for a few minutes and check if it’s still smoking any black smoke. If it is, then the issue may lie with the carburetor instead. See the next section for more information on this.

Malfunctioning Carburetor

If your air filter isn’t the problem, then the next source of the issue could be with your mower’s carburetor. The carburetor and other parts of the fuel system work together to mix oxygen and gas in the right ratio to create combustion, which in turn regulates the flow of fuel to the crankshaft that powers the lawn mower’s engine. When airflow to the carburetor is restricted, the fuel mixture becomes too rich in gas, and this can cause the mower to smoke black smoke from its muffler. Other signs of a malfunctioning carburetor in a lawn mower include the mower’s engine stalling during use or failing to start at all, the engine running roughly during use, and the mower consuming more fuel than usual.

How to Clean a Carburetor

Find the carburetor located on the side of the mower, behind the air filter and on the opposite side to the muffler, and inspect it. If the carburetor appears damaged or worn-out, you may need to replace the part entirely. If it’s just a case of a blocked or dirty carburetor, you can follow the steps below to remove the blockage and get it functioning properly again. If neither of these things seem to be the issue, it may be necessary to adjust the carburetor to increase airflow.

Remove carburetor bowl and its screws from mower

Use a plug wrench to loosen the screws holding the carburetor bowl in place, and remove them along with the bowl from the mower.

Clean carburetor bowl, hole and screws

Purchase an aerosol carburetor cleaner and use it to clean away any debris or residue from the carburetor bowl and screws. Aerosol carburetor cleaners are cans of pressurized air specially designed to clean carburetors, and some brands come with directional nozzles that help get into the harder-to-reach corners of the part – this Carb and Choke Cleaner from Gumout will do the trick. To remove any blockages, use a thin piece of wire or a nylon cleaning brush to clean out the hole that sits underneath the carburetor – we like to use the wire needles in this Cleaning Tool Kit to break through any tough debris.

Replace the carburetor bowl and screws

Take your plug wrench again and use it to reattach the carburetor bowl and its screws. Take care not to over-tighten the screws when replacing the bowl as this may distort the seal.

Our East Coast editor Frank focuses on lawn cutting and maintenance. His experience with lawn mower repair and lawn maintenance is second to none.

He is a lawn mower and fertilizer expert with over 30 years of experience in the industry. He has been providing advice to homeowners and businesses on lawn care since 1990 with his lawn maintenance business based in the small town of Waterbury, Connecticut.

When Should I Change My Lawn Mower Oil?

Change the oil in your lawnmower engine after the first five hours of use on a new mower, then at least once a year during the spring and summer mowing seasons, or after 50 hours of operation, whichever comes first.

Which Oil Is Best For A Toro Lawn Mower?

smoking, lawn, mower, troubleshoot, engine, smoke

The outside temperature determines the type of oil you use.


SAE-30 is the most popular motor oil for small engines such as lawnmowers, chainsaws, and snowblowers. It denotes a viscosity rating of 30, as specified by the Society of Automotive Engineers (SAE).

The oil classification ranges from 0 to 50. Highly viscous oils perform better in hot environments or high-temperature use. If you live in a warmer climate, you should use this engine oil.

SAE 10W-30

The SAE 10W-30 is a multigrade oil. It is multigrade because it has a variable range of viscosity. The oil’s viscosity is 10 when the engine is cold and 30 when the engine is hot.

The advantage of using SAE 10W-30 is that it performs better in cold weather. However, using this grade of oil may increase your oil consumption.

If temperature differences are relevant in your area, you can use a multigrade oil.

5W-30 SAE

SAE 5W-30 has a cold temperature viscosity value of five compared to 10W-30. This rating indicates that it is highly beneficial for cold-weather areas.

Because the viscosity of any fluid increases at low temperatures, if you live in an area where the temperature falls below 0 degrees, use 5W-30 instead of 10W-30.

How Long Does A Lawn Mower Engine Usually Last?

smoking, lawn, mower, troubleshoot, engine, smoke

The average lawnmower can last 8 to 10 years with proper maintenance and care.

A poorly maintained lawnmower may only last half as long. The number of hours used by some manufacturers determines the service life of their lawnmowers and components.

It’s A Wrap

Lawn Mower smoke can cause severe concern and anxiety in people unaware of the issues caused by their mower blowing smoke. Smoke from the mower is frequently caused by minor problems that can be resolved quickly.

Allow the burning mower to run for a while if there is white and blue smoke. Smoking will usually stop after a few minutes. Otherwise, follow the directions above. In the case of black smoke, check the fuel and ensure the carburetor and air filter are in good condition.

Made it to the end? Check out these helpful s below:

Cause #5: Oil Spilled on the Fuel Tank (Applicable to 4-Stroke Lawn Mowers)

Never mix oil and mower fuel if you own a 4-stroke lawnmower. Most lawnmower available in the market now comes with a 4-strokes engine, making them more reliable than the traditional 2-stroke ones. It’s also less difficult to maintain, but mixing oil will cause a serious issue.

Once they infuse inside the lawnmower, the oil will start burning, causing smoke while running. It’s also a perpetrator of premature engine wearing.

How to Fix Oil in the Fuel Tank

To fix the oil in the fuel tank and avoid smoke, the only way is to burn off the contaminated gas by letting the mower run and then replacing it with clean and fresh gas. You will experience white smoke coming out from the mower until it’s able to exhaust all the oil burnt.

But if you’re not comfortable with this fix, you can remove the fuel by detaching the fuel tank and filling it out with a new and clean one.

Step 1: Search for the Fuel Line

Look for your mower’s carburetor and search for the fuel line and fuel tank. This part of the engine is what feeds fuel into the engine.

Step 2: Detach the Fuel Line

Undo the clip that connects the fuel line and maintains its hold. Pull the fuel line off, and unplug the connection from the fuel line to the shut-off valve. The shut-off valve stops the fuel flow to the engine.

Step 3: Gather the Spilled Oil/Gas

Once you have removed the fuel line, the fuel will start to pour and collect with a pain to avoid engine oil spillage, which will be more difficult to clean. It’s also a fire hazard, so be careful about spilling oil over the floor.

Step 4: Empty the Carburetor

Please search for the carburetor and drain the fuel coming out from it. The carburetor of lawnmowers is located underneath, containing a tiny nut or screw used to empty the carburetor.