Spilled gas on mower. 7 Tips to Add Gas Safely to a Lawn Mower

How Long Is Spilled Gasoline Flammable For?

If you have a vehicle of some sort, then the odds are pretty good that you’re going to put gasoline in it and that at some point or another, you might spill some of that gasoline. The bad news is that gasoline is flammable and if you spill it, it becomes a fire risk. But how long is spilled gasoline flammable?

A gasoline spill will remain flammable as long as it continues to produce flammable vapors. This time can vary from a few minutes to a day, depending on the size of the spill and ambient temperature.

Let’s take a closer look at this, so you are well informed about a gasoline spill and what you should do.

Your priority is keeping your family safe. As a firefighter, I recommend everyone has updated smoke detectors that don’t require battery changes, like these ones from Kidde. a fire extinguisher, like this one from Amerex. and a fire escape ladder if you have bedrooms above the first floor, I recommend this one from Hausse.

How Long Is Gasoline Flammable When Spilled?

It really depends on the volume of spillage. In order for gasoline to be flammable, the wet liquid needs to be able to boil and become vapor.

Unfortunately, the boiling point of gasoline is fairly low and that means it’s easy for it to boil and become flammable.

However, this is also good news, because it means that the gasoline should dry reasonably quickly. Once the gasoline has dried up, it’s been consumed, and assuming the area is well-ventilated, the risk of a vapor ignition is low.

That doesn’t mean that the risk of a fire is reduced to zero, though, because while dry gasoline isn’t flammable, it can still burn.

So, as a semi-useful rule of thumb, for a small gasoline spill, assuming that you’ve mopped up most of the liquid, you can probably consider the gasoline to be flammable for about 15 minutes or so.

For a bigger spill though, it may take longer to clear.

How Long For Gasoline To Evaporate?

Gasoline takes almost no time to evaporate under ideal circumstances. Unfortunately, most of the time, circumstances are not ideal.

You need an impermeable surface to spill your gasoline onto for “ideal circumstances”, that is a surface that won’t absorb the gasoline.

Most of the time gasoline spills tend to be onto concrete or tarmac and thus, the gasoline can soak into the surface or even deep down into the area it was spilled on.

Woods and fabrics are even more likely to become soaked through with gasoline and thus, even more, likely to retain that gasoline for longer.

spilled, mower, tips, safely, lawn

All this means in real terms is that while gasoline could evaporate quickly, it probably won’t and it may take from 90 minutes to a whole day to do so.

Is Spilled Gasoline Actually Flammable?

Yes, while it’s the vapor that ignites rather than the fluid, gasoline has a very low flashpoint, and thus, whenever the fluid is present, so is the vapor.

The flashpoint of the vapor is around.46 degrees Fahrenheit! That means it takes almost no effort to burn gasoline.

Can Gasoline Ignite?

In fact, almost everything can ignite under the right circumstances.

The ignition point of gasoline is low in the presence of a spark or fire, but it won’t auto-ignite (that is spontaneously combust) until you reach about 500-800 degrees Fahrenheit.

Can Dried Gasoline Catch Fire?

Everything can burn if put under the right circumstances. However, assuming that the area is thoroughly dried then it should be no more combustible than it was before the gasoline was applied to it.

Be careful with fabrics and wood though, it is possible for the gasoline to sink into the material to a depth where you are unaware that it is still “wet”.

If you can smell gasoline on something, proceed with caution.

Does The Quality Of The Gasoline Matter To Its Flammability?

Yes, the quality of gasoline does affect the flammability, but not as much as some people online claim.

Nobody uses pure gasoline except in laboratory conditions, almost all other forms of gasoline are mixed with other chemicals to change the burning properties of the gasoline.

This is done for use in different vehicles depending on the needs of the engine. However, if we take unleaded gasoline, it has a flashpoint of.45 and an autoignition range of 459-853 and we compare it with 50-100 octane fuel then that has a flashpoint of.36 to.45 and an autoignition range of 536 – 853.

Does Where The Gasoline Is Spilled Affect Flammability?

Yes, to some extent. There are two types of surface to consider permeable and impermeable.

An impermeable surface (say glass or steel) won’t soak up any of the gasoline that has been spilled. This allows all the gasoline to easily evaporate.

This, in turn, means that in the early moments of a gasoline spillage, the gas is going to become vapor more easily on an impermeable surface and thus, be more flammable.

However, assuming the area is well-ventilated, the vapor will swiftly clear and the chances of fire will quickly drop once the gasoline has all evaporated.

With a permeable surface, the risks are different. It takes longer to evaporate in the first instance, which means the surface may hold gasoline for much longer, and thus, there’s a risk of fire for a longer period of time.

spilled, mower, tips, safely, lawn

How Long Will The Smell Of Gasoline Last?

Gasoline has a harsh odor and this might be considered a “good thing” because as long as you can smell the gasoline that was spilled, you know that there’s a risk of fire due to its flammability.

How to use these new gas can spouts. Silly

After all, what you smell is the vapor given off as the gasoline evaporates.

However, when gasoline is spilled into heavily porous surfaces the smell can last even when the vapors are all gone because there’s some gasoline trapped in the material. It may last until it has been properly cleaned.

This can be a problem for your clothes and for your vehicle.

Can You Remove The Smell Of Gasoline From Your Clothing?

It depends on how much gasoline has soaked into the clothing. If you basically dipped your t-shirt in gasoline, you’re going to need to throw it out.

If you have to throw it out, then make sure that you allow them to dry completely before putting them in the garbage (flatten the clothes out don’t ball them up for this).

If that’s not an option, then take them to a local waste management facility and drop them into a designated container for disposing of gasoline-soaked items.

Assuming that your clothes are salvageable:

  • Blot off the excess gasoline using a paper towel or rag
  • Then cover the stain in baking soda and let it sit for around 5 minutes
  • Then pop the baking soda in a plastic bag and dispose of it
  • Next soak the clothing in a bowl of 1:1 vinegar and hot water. Leave it for an hour.
  • Then ensure that there’s not even a hint of gas smell on the clothing, if there is, soak it some more.
  • Take only the clothing you have soaked (do not wash it with other items) and place it in the washing machine.
  • Run the machine at the hottest possible cycle for the clothing and use a no-fragrance detergent.
  • Then air-dry the clothing outside.

It should now be safe to wear again.

How Do You Remove The Smell Of Gasoline From A Vehicle?

Baking soda, vinegar, and water, then soap and water and a lot of air drying and open Windows.

Unfortunately, it’s harder to clean a car from a gasoline spill than a t-shirt because you can’t easily soak the interior of a car.

If you’re at all nervous about the job you’ve done, it might be a good idea to call in a professional to clean it for you.

This video gives some more specific tips for gasoline spilled in a car:

What Should You Do If You Spill Gasoline?

If you want to avoid a gasoline fire, the best thing to do is not spill it in the first place, but if you do spill gasoline, you can certainly make things less dangerous.

Firstly, ensure you do not turn on any electrical equipment or other possible sources of ignition (sparks) and don’t start any fire (such as for lighting a cigarette). That could lead to an immediate ignition of the gasoline.

Stop The Spillage Of Gasoline

The first thing to do is to stop the spill. That is close up any taps or open lids, stand up the fallen canister, that sort of thing.

Catch Any Spilling Gasoline

Then if there’s still gasoline pouring out of the container, catch it in something. Ideally, a metal tin or bucket but anything that stops it from continuing to run all over the place is a good idea.

Place Physical Barriers To Prevent Gasoline Leakage

Then it’s time to ensure that gas that has already spilled doesn’t go anywhere else, put up some temporary barriers of cloth to prevent it from rolling away, douse the fluid in baking soda or flour to help soak it up, and leave it for 2 hours.

Sweep up the material as needed after 2 hours and if it’s still wet, re-apply the baking soda/flour.

Then take the material outside in an open container and leave it to dry thoroughly.

Then wash the space with soapy water.

Ventilate The Space That You Spilled The Gasoline In

Once you’ve got things as dry as you can. Remove the cloths you caught the spill with and leave them to air somewhere safe until they are dry.

Open the Windows and doors in the space that the spill took place in to allow the vapors to mix with the outside air.

Wait for the space to dry fully and keep others away from it until then.

Finally, contact a local hazardous material management center and ask for their help in disposing of the waste products.

Here is a video showing another cleanup method using kitty litter:

Tips to Add Gas Safely to a Lawn Mower

Moving to the suburbs or buying your first home with a yard—especially for a previous city-dweller—is exciting, but there’s definitely a learning curve when it comes to mowing a lawn. Good on you for doing research since lawn mower accidents and injuries are (unfortunately) all too common. In this guide, learn seven tips to help you add gas to your fuel tank and preserve the health of your mower.

Read Your User’s Manual

Every lawn mower works a little differently. You’ll want to understand where the gas tank is located, as well as if you’ll need to prime your device before you use it to avoid lawn mower mishaps.

But let’s be honest: Sometimes, we buy new things and toss the manual. If that’s the case here, do a quick internet search of your lawn mower model to find the instructions as a PDF.

Buy the Right Type of Gas

For most lawn mowers, fresh unleaded gas works just fine. You can buy a 5-gallon gas can (around 20), then fill it right at the gas pump. The octane rating should be 87 or higher. If regular unleaded gas in your area is below 87, opt for premium gas.

Make sure you unscrew the lid and put the nozzle firmly in the gas can before filling at the pump. Don’t walk away as it fills. Take any other precautions as needed to prevent spills.

TILTING your lawnmower to the CORRECT side (and the reason why)

Natural gas has a shelf life of three to six months. If your canister still contains gas from last season, pour the old gas in a government-approved container and dispose of it at a local site.

Don’t Add Fuel When a Lawn Mower Is Running

According to the U.S. Consumer Products Safety Commission, tens of thousands of Americans suffer from lawn mower accidents each year. One of the most common injuries they face are burns, often from fuel that ignited due to misuse. Not good.

The vibrations from a running mower could cause you to spill gas on the engine, which can create harmful vapors or gas fire. It may seem convenient to keep the lawn mower running, especially if you’re halfway through the job and don’t want to walk your device back to the shed. But that’s exactly what you should do.

Make Sure Your Lawn Mower Has Cooled Down

Similarly, never add gas to a lawn mower when it’s really hot. The heat could be from use or even from a mower that sits in storage on a hot, humid summer day. Let it cool for 15 to 30 minutes before unscrewing the lid and adding gas.

Use a Funnel When Adding Gasoline

Investing in a funnel makes adding gas to a lawn mower safer and easier. You can buy a plastic funnel at home improvement stores for under 5. Place it in your gas tank, then gently pour gas in to fill.

You might as well get two funnels while you’re at it, so you have one to re-up your oil levels as well.

Screw the Gas Cap on Tightly

Most lawn mower gas tanks have a screw-on lid. Some click into place when they’re locked, while others may simply tighten. Always double-check that the gas cap is secure before pulling the rip cord to start your lawn mower.

Inspect Your Mower

You’re about ready to go! Since we’re talking safety, though, here are a few other steps you should take before hitting play on that podcast while you mow your lawn. These steps will help ensure safety.

  • Check the air pressure in the tires.
  • Check the oil levels and cleanliness of the oil.
  • Check the sharpness of your blade.
  • Remove any grime or dead grass from the bottom.

It’s a good idea to inspect and make any repairs each season, especially if your lawn mower has been in storage all winter. Also, maintaining your lawn mower should be an annual task. Doing so can make it last a decade or more.

⛽ Accidentally Put Gas in the Oil Tank on your Lawn Mower?

Affiliate Disclaimer: My content may contain links to products I use and love. As an Amazon Associate and participant in various other affiliate programs, I earn a small commission at no extra cost to you from qualifying purchases. I only recommend products I personally vetted!

We’ve all done silly things in the past and most likely you are here because you accidentally put gas in the oil tank on your mower. Well, fear not! I have even done that on occasion and there are a few simple suggestions to get the gas out of the oil tank safely.

Here is an example of when you put gas in the oil tank:


Handled properly, this can be a minor accident which can be fixed relatively easily.

Be sure to shut off the engine if there is any amount of gasoline inside of the oil tank.

Completely drain the oil tank using the drain plug and allow the oil tank to air out and dry overnight. Do this outdoors.

Fill the oil tank with new oil. If needed, drain the oil tank again to ensure all of the gas is out of the oil tank before adding new oil again.

Try starting the engine. If it works your mower is good to go. If not, seek the help of a professional who is able to take a look at your lawn mower’s engine and properly assess any damage that has been done to avoid making matters any worse.

You may be interested in…

How To Fix A Lawnmower That Will Not Start

Hi, Alex Kuritz here. Growing up I remember that my family had one of the best lawns in the neighborhood. Richly green and lush. I did a lot as I grew up in terms of caring and tending for not only my family’s lawn but also my neighbors. I can say I have years of experience, and I am here to share it with you.

2 thoughts on “⛽ Accidentally Put Gas in the Oil Tank on your Lawn Mower?”

Hi Alex, my name is Lily I live in Harvest, Alabama and I made this mistake. I poured gasoline into the oil tank. Of course not having realized what I had done I keep trying to turn the mower on. Eventually a neighbour came over and tried to help me also, then he asked me if it had gas and he pointed to the gas cap. That’s when I realized what I had done. I later carefully tilted my mower and poured out the gas and whatever oil was in there. Afterwards, I put the oil cap back on and stored my mower back in the garage because I knew it wasn’t going to work right away. I figured maybe it just needed to dry out and it would be OK. It’s been almost 3 weeks, I poured some new oil in there and I tried running it and white smoke came out everywhere. My neighbours told me that it was just burning oil. So I pushed it along a little bit mowed half of my front yard and it turned off on its own. I am just curious, is there a chance that I could still salvage my mower? As I think that I did not properly drain it or let it sit outside to dry out without the caps … I am just curious what are your thoughts.

Hi Lily, Thanks for writing in. I apologize for not getting back sooner. I’m actually over in Huntsville so HI! As for the oil issue, you would want to fill it and drain the oil a good 3-4 times to make sure you are getting all of the gas out. It is blowing through good oil but that is really the best thing you can do to get all the gas out.

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A smoking lawn mower is never a good sign. Whether the smoke is blue, white, or black, here’s how to identity and address the issue without the help of a professional.

By Glenda Taylor and Bob Vila | Updated Sep 24, 2020 1:40 PM

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Q: Recently, my mower started billowing smoke when I powered it up, so I shut it off immediately. Why is my lawn mower smoking? And is it a fire hazard? I want to know how to proceed so I don’t harm the machine.

A: Your lawn mower can emit smoke for numerous reasons—many of which don’t require the services of an expert. A homeowner can usually identify the reason for a smoking lawn mower by gauging the color of the Cloud coming around the engine, then fix it accordingly before lasting damage occurs. Keep in mind that all mowers with internal combustion engines contain the same basic parts, but the configuration of those parts varies widely, depending on manufacturer and model. Consult your owner’s manual if you’re unsure how to access a specific part of your lawn mower’s engine.

White or blue smoke may indicate an oil spill on the engine.

If you’ve recently changed the oil in your mower and the engine is emitting white or blue smoke, it’s possible that some of the oil spilled onto the engine. Similarly, you could’ve spilled oil on the engine by mowing on a slope greater than 15 degrees or tipping the mower on its side. The smoke may look disconcerting, but it’s completely harmless. Solve the problem by restarting the mower and allowing the spilled oil to burn off. If you tip the mower often for cleaning or maintenance, check your owner’s manual to determine the best way to reduce the risk of oil leaks.

An overfull oil reservoir may also cause white or blue smoke.

Ensure you didn’t overfill the mower by checking the oil level with the dipstick located on the reservoir. To do this, remove the dipstick cap, wipe off the stick with a rag, and reinsert it into the reservoir. Then remove the dipstick once again and determine the oil level in comparison to the recommended “fill” line on the stick. If the level is too high, drain the oil (consult your owner’s manual for instructions), then refill the reservoir with it. Start checking the oil level with the dipstick after you’ve added about ¾ of the amount recommended in the manual. Continue to add small amounts of oil until the level matches the recommended “fill” line. Also note that using the wrong grade of engine oil may cause blue or white smoke. Consult the owner’s manual for the exact type of oil recommended for your mower.

Black smoke may indicate that the mower is “running rich,” or burning too much gasoline.

Your lawn mower’s carburetor regulates the ratio of gasoline to air mixture. If the carburetor isn’t getting enough air, the mixture has a higher percentage of gasoline, which can create black exhaust smoke. It’s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor. Try replacing the air filter. (Note: air filters vary by mower model; view example air filter on Amazon.) Next, run your lawn mower for a few minutes. If the black smoke still appears, the carburetor might need to be adjusted in order to increase airflow. Either take the mower to a professional or adjust the carburetor yourself with instructions in your owner’s manual.

Take your mower to a repair shop if necessary.

If the previous steps don’t correct blue or white smoke, your mower could have a more serious problem, such as an air leak in the crankshaft (the cast iron or cast aluminum case that protects the moving parts of a mower’s engine). Continuing blue or white smoke could also indicate that some of the engine’s components or seals are worn out and need replacement. Similarly, if black smoking still persists after you’ve replaced the air filter and adjusted the carburetor, you could be facing a more serious mechanical issue. All of these problems require the help of a professional. If your mower is still under warranty, check with the manufacturer for the location of the nearest servicing dealer; problems stemming from a factory defect or poor workmanship may garner free repairs. If your mower is not covered under warranty, a reputable small-engine repair shop should also be sufficient to get the job done.

Which Way To Tilt Lawn Mower? (Don’t Do This)

A clogged grass chute is a real pain in the jacksie, and it’s very tempting to just trough the mower on its side, making clearing the grass easy…. but wow! Not so fast. There’s a right and wrong way to do it.

Which way to tilt lawn mower? The correct way to tilt a mower is with the handlebars to the ground or turn the mower on its side, but always with the carburetor side facing upwards.

In this short post, I’ll show you the right way to tilt your lawnmower over and why it’s so important to get it right.

This post covers tilting your mower pretty well; however, if you need video help, check out “Correct way to tilt mower video” and if your mower is struggling to start after tilting incorrectly, check out “How to unflood a mower engine video”.

Correct Way To Tilt Your Mower

Before working on a lawnmower, it’s always a great idea to pull the spark plug wire; this prevents any possibility of the engine starting.

spilled, mower, tips, safely, lawn

The correct way to tilt your mower is with the handlebars to the ground. In the workshop, I hook the handlebars under a sturdy workbench. This is the recommended way to tilt a mower for inspection. Problem is, tilting the handlebars to the ground doesn’t offer good visibility or access.

Correct way – Handlebars to the ground.

The alternative is to tilt the mower on its side, but it’s important you choose the correct side; see below. Both sides of a lawnmower engine aren’t the same. Most lawn mower engines are configured with the air filter/carburetor positioned on one side and, on the opposite side, the exhaust/muffler.

It’s important to identify the air filter/carburetor side. This is the side that must face skyward when the mower is tilted. Get this wrong, and the symptoms include:

  • Leaking gas
  • Leaking oil
  • Hard to start mower
  • No start mower
  • White smoke when starting

While a mower fire is rare, it does happen. Leaking gas and vapors can ignite when they come in contact with a hot exhaust/muffler.

Carburetor Side Up

Great, but how to identify your air filter/carburetor side? On some mowers, the carburetor won’t be very obvious, but luckily the air filter cover lives in the same location as the carburetor and is usually pretty easy to spot.

You can identify an air filter and its cover by its characteristics; they include:

  • Positioned to one side of the engine
  • Easily accessible
  • Made from plastic (black usually)
  • Easily detachable
  • Often rectangle shaped

Need more info on the fuel system, carburetor components, and how they work, you can check them out here.

Take a look at the photos below, and you’ll get the idea. If you need more help, check out this post “Where’s my carburetor?”

Don’t forget to refit your spark plug wire before attempting to restart your mower.

What If You Tilt Your Mower The Wrong Way?

Don’t panic. It’s not that big a deal. If you tilted your mower the wrong way, just tilt it onto its four wheels again and clean up any spilled gas. Oil and gas may have made their way to the air filter, and saturated it. So the first thing to do is check the air filter; you’ll find it behind the air filter cover. Most covers are tool-less access.

If the filter is wet and it’s a pleated paper filter, you’ll need to replace it. Allowing it to dry out won’t fix it.

A saturated air filter prevents the correct amount of air from entering the carburetor, which can cause the engine to:

OK, we’re not out of the woods just yet. In addition to the air filter being saturated, the spark plug may also be oil/fuel contaminated. It’s known as spark plug fouling and it’s caused by excess gas/oil inside the combustion chamber (flooding).

In extreme cases of flooding, the cylinder fills with gas and prevents the engine from cranking over, a condition known as hydro-locking (remove the spark plug to fix).

After you’ve checked and fixed your air filter, check your oil level and top up if needed, remove oil if too full. Now go ahead and crank over your engine without using a choke. If it starts it may blow white or black smoke, don’t worry, looks exciting but it’s normal.

If on the other hand, your engine won’t start. Leave it to sit for an hour before trying again, or if you just can’t wait. Remove the spark plug and clean it.

You should be golden, and if you’re not, check out “Unflood mower video” and also “Lawn mower white smoke”.

spilled, mower, tips, safely, lawn

Related Questions

Why is my lawnmower smoking? The most common cause of a lawnmower’s smoking is too much engine oil. However, other possible causes include: