Lawnmower keeps shutting off

11. Blades Won't Engage. The mower blades won't engage on a SCAG zero turn when the PTO switch is faulty, the battery is weak, a safety switch failed or the clutch is bad. The blades won't turn when the belt is worn or has fallen off the pulleys due to a stretched belt, bad pulley bearing, or worn tensioner parts.

About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...It was the fuel shut off soleinoid. Not sure what the diesel one looks like, but on mine, its 2 small wire going into the bottom of the carb. The connections were corroded. If I turned the key on, (but not start mower), I wiggled the wire and could hear & feel it shutting off. I've seen diesel soleinoids on ebay for around $70.Randy Langston @randylangston. Rep: 25. 1. Posted: Mar 20, 2011. Options. The fuel tank vent is most likely plugged up. This is either built into the tank or part of the fuel tank cap. Next time it starts to happen loosen the gas cap to allow air in to prove problem. Randy.1. Bad, Old, or Wrong Fuel. Running good fresh fuel through your riding mower is best. Gasoline can begin to break down and become less effective as soon as 30 days after purchase. Ethanol in your gasoline along with the moisture it attracts can gum up the fuel system causing clogs. When this happens, your lawn mower starts then dies.Wow. So much angst on the innerwebbs. Someone even dropped the N word over a lawn mower. I got no dog in the fight but the OP may want to check if the unidentified unit has an auto choke that is closing when shut off hot and needs to cool down till a rich mixture starts the engine.

If your lawnmower start and runs for a couple of minutes then stops, it could be a venting issue! I show you a quick, easy, fast way to check it.Click here ...My lawn mower keeps turning off when mowing certain areas of my yard. Seems like the motor drowns and shuts off when cutting areas where grass is a bit longer. This started happening this year. Please help! Several factors can cause a GreenWorks lawn mower to shut off unexpectedly. Here are some common reasons: Clogged Air Filter: A dirty or clogged air filter can restrict airflow to the engine, causing it to stall. Regularly clean or replace the air filter according to the manufacturer’s recommendations. If it begins to bog down and shut off, the fuel cap could be the cause of your starting problem. FIX: You can try to clean your cap and remove the clog to allow your gas cap to vent. If this doesn't work, you'll need to replace your gas cap. 4. Bad Spark Plug or Loose Connection. Your riding lawn mower may use one or two spark plugs.Mar 15, 2022 · The vent is a crucial part of the electric lawn mower. It sends much needed air to the motor, and without this crucial air supply the engine can begin to overheat quickly. If the clog isn’t taken care of in time, it may eventually cause the engine to blow out completely. 4. Start Switch is Not Responding. So, if your John Deere Tractor keeps shutting off, here are the common reasons likely to be responsible. 1. A Clogged Mower Deck. The mower deck houses the blades responsible for cutting grass. After working for a while, accumulated grass can clog the deck, especially if you are cutting wet grass. This mass of debris affects the quality of cuts ...

2. May 20, 2018 / Starter Stays Engaded Even With Ignition Off. #1. I'm currently dealing with a starter/starter solenoid issue with my dad's lawn mower. It is a 13hp John Deere LT133 with a Kohler engine. Nearly every time I start the mower, the starter stays engaged even when I turn the key to the off position.7. Fuel line/filter clog. A fuel line that is clogged can also cause a lawnmower to cut out. The fuel line carries the gas from the fuel tank and delivers it to the engine. If a clog or blockage is in the fuel line, this results in not enough fuel pressure and will result in the mower turning off or cutting out.Some are plastic and are fitted in the gas line. Others are built into the carburetor. On some of the older Honda mowers, the fuel valve is built into the on/off control lever, so fuel is automatically shut off. Where - The Honda Fuel Valve is found on the right side of the engine, as viewed from the front of the mower.A lawn mower won't start when there is bad fuel, a dirty spark plug, a plugged air filter, a clogged fuel system, a dirty carburetor, a clogged fuel cap, or a bad safety switch. A mower with an electric start may have a bad battery, loose or corroded wires, or a bad starter solenoid. If you are unsure of your mechanical skills, it's best to ...Repeated Stop Start of the Lawn Mower. If the rectifier, motor, and thermal cut-off switch are all ok, then the cause of your electric mower cutting out could be down to repeated starting and stopping of the lawn mower. Every time you start your lawn mower, the motor requires a large current to get the motor spinning.

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Dirty Spark Plug. A dirty spark plug is one of the most common causes of a lawn mower stopping when it gets hot. The spark plug helps to ignite the fuel in the engine, which is necessary for the lawn mower to run. When the spark plug becomes dirty, it can cause the engine to misfire and not ignite the fuel, leading to the engine shutting down.Step 2- Take the Engine Shroud off to check the contact between Control Bracket & Switch stop: First, use an electric driver or Phillip screwdriver to remove the two screws holding the engine shroud cover. Then push the cover back as shown in the picture. Next, pull back on this handle a few times to disengage the brake.6. Mower keeps shutting off. When a mower shuts off unexpectedly, it can be frustrating. However, you can usually fix the problem yourself. It can be due to a clogged air filter. Clean the air filter to remove debris so the blades can properly spin. The trouble with the throttle lever. Make sure the lever is not stuck or damaged.Lawn mower stalls right after starting, and this will show one possible solution to the issue. Please subscribe to my channel, I am looking to upload more ar...Your Toro lawn mower starts then dies when the engine doesn’t receive sufficient air or fuel flow. This can be from bad fuel, a plugged filter, a dirty carburetor, or a bad gas cap. An insufficient engine oil level, clogged deck, and dull mower blades can also cause your mower to die while mowing. This post may include affiliate links.Find Solutions. Back. My Lawn Mower Starts then Stops. 01 - Lawn Mower Carburetor. The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving …

Messages. 1,851. Apr 25, 2012 / Scag Turf Tiger misfiring/cutting off while mowing. #4. A few things to look at: Check all plugin connectors particularly the engine harness adapter connector as all battery power comes thru it. Just had to clean all the connectors on my 2008 Tiger Cub to include the connectors on the PTO switch and key switch.My John Deere Scotts Lawn Tractor would not start. The main fuse kept blowing every time I turned the key. In this video I diagnosed the problem by searching...6. Posted: Mar 29, 2017. Options. Ah this is simple. when you look at the ignition, where the key goes, there should be a little icon of a mower with an arrow. After you start the mower, turn the key to this position. If it isnt there it wont go reverse, so after starting just move the key to that position and it should fix it.When trying to find the reason your Craftsman mower belt keeps coming off, you may notice your belt has shredded marks on it. This is most likely from the belt running against a bracket or your belt keepers. You’ll need to check the route of your belt to see what it might be rubbing against. You may notice a shiny spot on the metal of a ...If the mower keeps shutting off when you cut thick areas of grass, make sure the mower height is not set too low. Many mowers have wheel levers at each of the mower's four wheels, or another way to adjust the mower height. Stop the mower engine, raise the height and resume mowing. If the mower quits again, raise the deck higher, to the highest ...Have a lawn mower small engine mechanic replace a bent crankshaft. The engine will have to be removed to do this. Note: it may be less expensive to purchase a new mower. ... Metal and plastic shut-off valves are prone to leaking: Replace the shut-off valve: Cracked Fuel Lines: Rubber fuel lines become dry and cracked causing gas to leak:A Troy-Bilt lawn mower may die because there is a fuel or air restriction that prevents your mower from running. An insufficient engine oil level, blocked cooling fins, and a clogged mower deck can cause the …Lawn mower starts then dies right wway - 5 solutions to solve this problem. ... Clean off the cap and flush water through the pinprick if possible, to clean it out. Place it back on and start it up again to see if that fixes the issue. ... it will prevent most of the similar issues with your lawn mower automatically as it will keep everything ...1. Bad, Old, or Wrong Fuel. Running good fresh fuel through your riding mower is best. Gasoline can begin to break down and become less effective as soon as 30 days after purchase. Ethanol in your gasoline along with the moisture it attracts can gum up the fuel system causing clogs. When this happens, your lawn mower starts then dies.The most common causes for a mower to stop when blades are engaged include the mower being in reverse, faulty safety switches, bad fuel, or clogged fuel lines. Trying to engage the blades in tall or wet grass can also cause the mower to die. While fuel can be a common issue, it might not be your issue. Several other possible things might be ...Newer riding mowers use polyethylene material that can become weak at the seams and leak. In this case, it is best to replace the tank with a new tank. Fuel Shut-Off Valve. The next place to look for a fuel leak is the fuel shut-off valve on the bottom of your gas tank. Shut-off valves are known to leak whether they are made of metal or plastic.

I actually have a 2nd one of these as well that works fine. The issue with the one is that after about 25-30 minutes of mowing the blade motor will stop spinning, it will keep self propelling at this time. The mower will start back up and run for a short time and stop again like it is overheating, i change the battery and the same issue, even ...

Messages. 1,415. May 29, 2010 / Stihl chainsaw keeps shutting off. #2. There was just another thread with similar question - turned out to be clogged/dirty muffler/ spark arrestor -- the restriction in the ehxaust causes back pressure. This may not be your problem, but check the exhaust and clean the muffler and spark arrestor screen.Avoiding Damage to Your Lawn Mower. lawn mower, properly turning off, avoiding damage, importance, burstiness, perplexity. Step-by-Step Guide to Turning Off Your Lawn Mower. Turning off a lawn mower may seem like a simple task, but it's important to do it correctly to ensure your safety and the longevity of your equipment.If your lawn mower keeps shutting off when it gets hot, there are a few preventive measures you can take to avoid this frustrating issue. One common cause of this problem is a dirty air filter. Over time, the air filter can become clogged with dirt and debris, restricting airflow to the engine.It WILL turn over if it has a low oil shutdown, but will kill the ignition immediatly or after a few seconds. The Vanguard twins do have low oil ...Jun 2, 2023 / Toro Timemaster Won't Shut Off. #10. The kill wire that turns the mower off simply grounds the coil. If it falls off at the coil end then the mower will not turn off. The terminal is hidden on the underside of the coil so is hard to see. They have been known to fall out or break off . 1.Jul 30, 2014 / Mower randomly shutting off #2 Did you check the pressure switch in the seat. If a wire is loose or something, that would do it. Sent from my iPhone using LMF . S. Sonders Well-Known Member. Joined Aug 26, 2013 Threads 26 Messages 184. Jul 30, 2014 / Mower randomly shutting offHi everyone, recently bought a 21" self-propelled ryobi lawnmower. It's the 40v HP brushless. It works fine for approximately 15 minutes but then it keeps stopping. Pressing on the buttons makes it start again, but the more I restart it, the more frequently it stops. It does it even if I simply use the self-propelled features (without the ...The seat cut off switch on a lawn mower can be disabled in just a few minutes. Disable the seat cut off switch on a lawn mower with help from an outdoor powe...

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1 post · Joined 2023. #1 · May 25, 2023. Mower starts and runs just fine, but after a very short time driving (often 10-30 seconds) the engine shuts off as if fuel has been cut off. Throwing the left drive arm into the neutral position keeps the engine running. Throwing the right arm into neutral does not have the same effect.Ryobi 40v Lawn Mower Keeps Shutting Off. There are a few potential reasons why your Ryobi 40V self-propelled lawn mower might be turning off while you’re using it: 1. The battery is low. If you use a cordless electric lawn mower, the battery may be low, causing the mower to turn off. Make sure the battery is fully charged before using the ...Ego mower shuts off after a few seconds. I was mowing today and about half hour into it, the mower just shut off and the light blinked back and forth between green and yellow. Once it stopped blinking I could start it again and it'd run about 5 seconds, shut off, and blink again. I tried different batteries, everything looks in good shape.If your lawn mower shuts off after running for a while, the fault can be with your fuel cap. You can try to see if you can clean the cap to allow it to vent. If you cannot, you need to replace the gas cap. 7. Cub Cadet Has a Plugged Lawn Mower Air Filter . Something as simple as a plugged air filter can cause your Cub Cadet to shut off.Vapor Lock. One of the causes of the situation when a lawnmower stalls when hot can be with the vapor lock. Unfortunately, one that is often overlooked, is when the hot gases inside the fuel tank cannot properly vent. The gas flow in the system can reverse, due to pressure, hence, causing the gas to leave the carburetor and shutting the engine ...Clean the spark plug if it's corroded, or replace it. The spark plug is responsible for providing the spark that ignites the fuel and air in the engine, but without that spark, the mower won't start. Refer to the manual to determine where your spark plug is located. Use a socket wrench to remove that plug and inspect it.A lawn mower won't start when there is bad fuel, a dirty spark plug, a plugged air filter, a clogged fuel system, a dirty carburetor, a clogged fuel cap, or a bad safety switch. A mower with an electric start may have a bad battery, loose or corroded wires, or a bad starter solenoid. If you are unsure of your mechanical skills, it's best to ...Aug 8, 2020 / John Deere D130 Blades still turning after disengagement. #1. Purchased @ Lowes in 2015,inherited by me in 2020. 86.1 hrs. Replaced both spindles, pulleys, blade & belt. At disengagement & deck height set @ "4 the blades turn with full authority. Engaging/dis-engaging makes no difference in load/rpm.A Husqvarna lawn mower won't start because the engine isn't getting the air, fuel, or spark required. This is due to a plugged air filter, dirty carburetor, bad safety switch, faulty gas cap, plugged fuel filter, clogged fuel line, bad starter solenoid, or bad fuel pump. There are many items on a mower that can fail and cause it not to start.May 5, 2021 / Cub Cadet shuts off when you pull the handles in. #3. There is an interlock circuit that goes between the parking brake & the lap bars so you can not try & drive away with the brake on. I don't have the wiring diagram for your mower. Some times it is a simple loop & other times it is done with a relay.1. Bad, Old, or Wrong Fuel. Running good fresh fuel through your riding mower is best. Gasoline can begin to break down and become less effective as soon as 30 days after purchase. Ethanol in your gasoline along with … ….

If your Ryobi 18v lawn mower keeps shutting off during use, it could be due to a number of reasons. One possible reason is that the battery is not charged fully or has become damaged. Check the battery level and try charging it fully before using the lawnmower next time. Another reason for sudden shut-offs could be debris or grass clogging up ...Step by Step!Today we'll be going over a Craftsman riding lawn mower that randomly shuts off while cutting grass.My customer said after about 20 minutes, it ...Step 2- Take the Engine Shroud off to check the contact between Control Bracket & Switch stop: First, use an electric driver or Phillip screwdriver to remove the two screws holding the engine shroud cover. Then push the cover back as shown in the picture. Next, pull back on this handle a few times to disengage the brake.Check the carburetor. The carburetor regulates the mixture of gas and air going into the engine, which is then burned to crate power. A clogged or dirty carburetor is often the culprit when a lawn mower won't start. It can also cause your mower to run rough or spew black smoke. To get to the carburetor, you'll have to remove the air filter.2) Try folding the handles down, then firmly fold open the handles to the operating position. 3) The handles need to be fully extended for the mowers to operate correctly. 4) The grass bagger must be fully seated (installed correctly) for the mowers to start. 5) Batteries charged and fully installed.My corded Kobalt 21 inch electric mower shuts off when hot, or under heavy load sometimes. The reason for this is the thermal switch that shuts off the elect...txgrassguy. Remember that air cooled engines actually heat up a bit at idle and this may be a cause for the back firing. Unburnt fuel is ignited from the heat in the cylinder which can cause the back firing. The idea behind shutting a motor off at full throttle is the unburnt fuel is dumped into the cylinder actually cooling it down somewhat.Ryobi 40v mower cuts out after a few seconds. Starts up just fine, runs fine until I move forward. It cuts out anywhere from 2-10 seconds. Mostly around 2. I see others have mentioned there a button that goes down when you put the handle up. The apparently becomes loose. That is not the issue with mine. I checked to see that the bolts were right.Below are some of the most common reasons why your lawn mower stops just some minutes after starting. 1. Check the Carburetor. If your lawn mower starts then stops, the problem might be the carburetor. The work of the carburetor is mixing gas with the correct amount of oxygen, leading to combustion. The combustion enables … Lawnmower keeps shutting off, 1. Bad, Old, or Wrong Fuel. Running good fresh fuel through your riding mower is best. Gasoline can begin to break down and become less effective as soon as 30 days after purchase. Ethanol in your gasoline along with …, Hi my Greenworks 40V mower keeps switching off after 3 seconds, I thought it was a bad battery, Amazon sent another one. Still does it. Mechanic's Assistant: How old is your GreenWorks lawn mower? When did you last change the oil? 3 days. Mechanic's Assistant: How long has this been going on with your GreenWorks lawn mower? What have you tried ..., About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., In this video I demo how to quickly check if you have fuel issue and how to check the fuel pump and fuel shut solenoid. If your mower engine does not turn ov..., 01 - MTD Lawn Mower Carburetor. The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to ..., Aug 11, 2017 / Blades keep spinning. #1. I have a Troybilt 12AT609G766, that when I disengaged the deck belt, the blades continue spinning. The belt is loose. So loose, that I can (after shutting it off) can take it off any pulley without much effort. The belt itself, is a little worn, but not too bad, as it cuts great, when it's mowing., Mar 20, 2016 / Engine turning over in key off position. #1. I have a Briggs & Stratton 20HP engine in a MTD Huskee brand mower. The battery was dead so I was charging it. I attempted to start it after a couple of hours but it still wasn't charged enough and turned over very slow. I turned the key to the "off" position but the engine continued ..., 35 posts · Joined 2014. #1 · Aug 9, 2018. I have a wright stander x with f x 691v Kawasaki.1100 hours. It shuts off after some Times 10 minutes,sometimes 30.it won't start up unless you let sit 2 ,3 minutes,then it might run for 10 minutes or maybe just long enough to get back on the trailer. I took it back to the dealer,they had it for ..., A friend of mine just dropped off a Cub Cadet LT1045. He asked me if I could help him fix a problem with the PTO. He says that the PTO will intermitently just shut off. If he flips the switch off and on, the PTO comes back on again. I'm going out right now to see if I can find any obvious problems, but I'm shooting in the dark a little bit here., The lawn mower ignition coil kill wire is essential to the machine's ignition system. Read the post to learn its function and how to fix related issues! ... The mower's ignition coil kill wire is an essential safety feature that ensures the engine shuts off when necessary. You can keep your mower running safely and smoothly by understanding ..., 6. Apr 3, 2020 / Craftsman starts then shuts off. #1. Hey all, Sears Craftsman mower has been running great for years and I treat it well. I was mowing fine then the motor turned off. Each time I try to start, it turns over fine runs for 2 to 3 seconds then shuts off. Figured a fuel issue so I pulled the carburetor, disassembled it, carefully ..., My twin force lawn mower is making clattering noises as if a bearing is failing ... i have an exmark 60 with kohler comand pro 27 i got it out the other day to mow and while i was mowing it shut off like it was out of gas started it back up and finished the yard the next week went ou ..., Jun 2, 2023 / Toro Timemaster Won't Shut Off. #10. The kill wire that turns the mower off simply grounds the coil. If it falls off at the coil end then the mower will not turn off. The terminal is hidden on the underside of the coil so is hard to see. They have been known to fall out or break off . 1., If you’ve got quite a bit left, you’ll need to open the hood or engine cover and use a wooden stick to pop the spark plug connector wire off of the spark plug terminal. Make sure not to use anything other than a wooden stick, and it needs to be a dry stick – you are using it to break an electrical process, so you need to make sure that ..., 444 posts · Joined 2008. #1 · Aug 6, 2013. The PTO on my JD Ztrak 830A has just started shutting down while I'm mowing. It's not too hot. mid-80's lately, and if I shut down the engine, then re-start, it will work again. The first time it happened, I had been mowing for about 1/2 hr and I saw no indicators on the status panel, it just shut off., When it comes to lawn care, having the right lawn mower can make a huge difference. Whether you’re looking for a powerful electric mower or a reliable gas-powered one, there are pl..., When the solenoid shuts off, the spring loaded needle valve it controls should close, shutting off fuel to the carburetor. The engine starves and dies in five or ten revolutions; it uses only what fuel is in the carburetor at the time. At the same time, when the coil kill wires are grounded, it creates a short in the coil primary circuit and ..., When trying to find the reason your Craftsman mower belt keeps coming off, you may notice your belt has shredded marks on it. This is most likely from the belt running against a bracket or your belt keepers. You'll need to check the route of your belt to see what it might be rubbing against. You may notice a shiny spot on the metal of a ..., Here's why this happens and what you can do: Dirty Air Filter on Your Lawn Mower: Clean or replace. Cutting Tall Grass: Raise the cutting height on your lawn mower. Dirty Spark Plug: Clean or replace. Build Up of Clippings & Debris: Clean underside of your lawn mower deck as noted above. Dull, Bent or Loose Mower Blade: Sharpen or replace., By. Eric Blankenburg. Most problems that will cause a John Deere lawn mower to stall after 20 minutes occur due to the distribution and rate of flow in the fuel and air systems. If these systems are dirty or restricted, the mower will stall out and be difficult to restart. Locate the source of the fuel or air loss to get your John Deere lawn ..., Faulty fuel pump. Plugged fuel filter. Clogged fuel line. Bad fuel cap. Plugged air filter. Plugged or broken cooling fins. Dirty spark plug. Bad ignition coil. Too much or too little …, A Cub Cadet lawn mower may quit when it gets hot because the air filter is plugged, the fuel system is clogged, the oil level is insufficient, the cooling fins are plugged, the spark plug is bad or there is debris buildup under the deck. I've put together a list of the main reasons your Cub Cadet mower engine gets hot and shuts off., Common Reasons Why a Lawn Mower Stalls When Cutting Grass. 1. Being Overworked. One of the most common reasons that a lawn mower might stall while it is cutting grass is that it is being overworked. This is a mechanism that is intentionally incorporated into the mower to prevent the motor from being blown. 2., Jun 2, 2023 / Toro Timemaster Won't Shut Off. #10. The kill wire that turns the mower off simply grounds the coil. If it falls off at the coil end then the mower will not turn off. The terminal is hidden on the underside of the coil so is hard to see. They have been known to fall out or break off . 1., May 26, 2021 · If your lawnmower makes loud bangs or pops on shutdown, afterfire may be the problem rather than a backfire. Backfires typically describe a bang or explosion while the engine is running or as it is shutting down. Afterfire happens after the engine has stopped. Neither is harmful or dangerous but do indicate something may be wrong. , Lawnmower backfiring is often due to improper air-fuel mixture and delayed combustion. Fix by replacing fuel filters, repairing fuel pumps, tuning the engine, and cleaning/replacing spark plugs and wires. Installing anti-after-fire solenoids prevents backfiring when shutting off. ( CC BY 2.0 ) by raybdbomb. Don't stop now!, Express Solutions: Dewalt Lawn Mower Keeps Shutting Off? Reason 1: Battery Not Providing Power. Solution: Inspect and Replace the Battery. Reason 2: Carburetor is Dirty. Solution: Clean the Carburetor. Reason 3: Air Vents Not Cleaned. Solution: Check and Clean Air Vents. Reason 4: Fuse is Bad or Defective., Turn off the engine: First of all, you must turn off the engine of your lawnmower, and wait for a while for all of its parts to completely stop moving.Now, you must disconnect the wire of its spark plug.Now, remove the cover and pull the old air filter out. Use a dry cloth: To clean your air filter housing, you must use a dry cloth.Never use any detergents or solvents, as they are harmful., A Husqvarna mower belt can keep coming off your mower when the deck belt is worn, stretched, or shredded. Excessive vibration can cause a belt to come off your pulleys when a bearing, tensioner bracket, or tensioner spring is worn. There are additional factors that can cause a mower belt to come off. I have prepared a list of reasons so you can ..., A Honda lawn mower may start and then die when bad fuel clogs the fuel system; a plugged air filter or incorrect choke position restricts airflow; a spark plug or coil is bad, or the mower overheats from an incorrect engine oil level or a plugged mower deck. I put together this guide to help you get your Honda mower up and running again., While pulling the plug wire is probably the easiest method of turning off a lawn mower with a faulty lever, it's also the riskiest. Therefore, if you don't feel comfortable, you might want to try another method, such as turning off the mower using the gas tap. The gas tap on your lawn mower is usually found next to the carburetor., 1) Faulty Spark Plug. 2) Dirty Air Filters. 3) Carburetor Issues. 4) Exhaust System Troubles. How To Fix A Backfiring Lawn Mower When Turning Off. 1) Check And Replace Spark Plugs. 2) Clean Or Replace Air Filters. 3) Adjust Carburetors Properly. 4) Inspect The Exhaust System Regularly., If the filter isn't serviced regularly it will eventually trap enough debris that the flow of fuel to the carburetor will be greatly restricted or even cut off completely. If your lawnmower starts but then shuts off, you could have a plugged fuel filter. There are two types of fuel filters commonly used on lawnmower engines: in-line and in-tank.