How To Clean Lawn Mower Gas Cap Vent

This includes the fuel system. The side tabs move and the larger hole in the middle of the bottom of the cap is clear, but down inside the hole in the middle it looks like there's supposed to be a second open hole of some sort. When you tip over the mower, the fuel can flow into the carbon cap. Unscrew the tank cap. Try loosening the petrol cap – if this results in the engine staying running, it may need to be replaced. don't get burned by high mower parts prices and don't play around with your safety with a leaky gas tank. The vented gas cap is designed to vent small amounts of air into the car gas tank line. I tend to agree with our K9handling buddy that (the smallest possible) holes should be quite sufficient to vent the tank, however I cannot drill in the side of the gas cap because, when you look at a Porsche screw-in type cap, any hole on the side of it (w)(c)ould, I reckon, be physically blocked-off sideways by the very tube it is screwed into. To see if this is the problem, slightly unscrew your gas tank so that air can get into the fuel tank, then try to run your mower, if this works, you. The problems could be the age of the fuel in the tank, dirt or debris in the carburetor, or an obstructed fuel tank vent. Tune Up Your John Deere Lawn Mower: Change the Spark Plug. Gasoline gets stale in 4-6 weeks and can gum up the lawn mower's carburetor. I also blew the rest of it clean with compressed air and have never. If the fuel cap does not take care of it, the carb will need to be removed, disassembled and cleaned. 71189 Lawn Mower pdf manual download. Re: Fuel tank cap vent - how to check/test? I took a closer look at the cap. What can you use to clean a lawn mower gas tank? What is wrong if gas leak from vent hole of gas cap on lawn mower even after caps have been replaced It is so bad that gas runs down over tank. Lawn Mower Blade Removal Guide – How To Do It Like A Pro For Free Lawn mower blade removal becomes a necessity when those vibrations start to become annoying. Following these tips will help you to avoid most fuel related problems. It is also designed to vent excess heated gases to keep the right amount of pressure, which allows the fuel to be pumped into the carburetor via the fuel line. On the old cap there was a piece floating on the inside and behind that on the outside there was a hole that I am assuming is the vent. Turned out the vent hole in the cap was plugged by a spider or who knows what. Now it smells flooded. So as mediaguy suggested - try running with the fuel cap off as a quick check. Use a crescent wrench or pair of vise grips to turn the metal base and remove the spark plug, then place a few drops of oil into the open cylinder. To see if this is the problem, slightly unscrew your gas tank so that air can get into the fuel tank, then try to run your mower, if this works, you. Tilt the mower back to lift the front wheels then secure the mower handle to your work table to hold the mower steady as you remove bottom-mounting screws. and the mower deck. The pump is the part of the mower that will actually send the fuel from the tank to the carburetor. When considering why a lawn mower crankshaft bends, it's helpful to understand just how much energy exists in the rotating blades. Gas Cap for EXi OHV Engines is rated 3. Remove the gas cap and clean the air vent. How to Clean a Fuel Tank in a Lawn Mower or Small Engine 1. Manufactured to meet OE specifications, this gas cap fits most lawn tractors manufactured by MTD. Need help with your Briggs and Stratton Parts Lookup? Complete our Parts Lookup Help Request Form and we will be happy to assist you. SMARTSTOW® allows the mower to be stored vertically, reducing the storage footprint needed by up to 70%*, and provides easier access for you to clean the under-deck and service the blade. As for this problem with kohlers you don,t bother wasting time with gas cap air vent restrictions , when experience and symptoms obviously dictates the problem with George's 159 Toro is coil related , although just loosening the cap would validate your position , rather than advising someone to poke at the rubber air vent poppet. the fuel tank seems clean and doesn't act like there is a vacuum or pressure build up when i take off the fill lid. Fuel caps have vent holes to allow air into the fuel tank. 8 out of 5 by 49. If you do not see the Kohler Part you need, please complete the Lawn Mower Parts Request Form and we will be happy to assist you. Remove the gas tank from a john deere x300 My wife while pouring gas into the mower last year dropped the little cap into the gas tank of the mower. how do i know this? many many years ago my mowers vent cap malfunctioned and quit venting. If it starts then clean or replace the filter if it is damaged. Ariens Genuine OEM Ariens Gravely Lawn Mower Fuel Gas Cap 00273700, 03859100, 07525300. We are an Authorized Kohler Dealer and Service Center carrying a large selection of Replacement Gas Caps for Kohler Small Engines. You can collect gas in a jug or other suitable container (don't use one made from polystyrene which dissolves in gas). Manufactured by Exmark. The mower is receiving so little fuel, it is amazing that the engine stays running The mower is used for residential use only on a 3 acre farm. Many small engines gas caps have vent holes. The fuel system is a sealed system, so it may cause the check engine light to go on, but it will not harm the car. Try removing the fuel filler cap and see if it runs smoother. If I turn off the mower deck and it will usually recover with lots of smoke then run just like normal. The side tabs move and the larger hole in the middle of the bottom of the cap is clear, but down inside the hole in the middle it looks like there's supposed to be a second open hole of some sort. After widening the hole a bit, it ran for the rest of the day. Clean engine cooling fins and mower deck. Maybe it will start after it sits a while with the gas cap off. Inane Cathode, Aug 12,. The Vent tube, Fuel return line and fuel line are inserted through the three holes. Be sure the fuel cap vent is closed. By simply brushing off the particles, this reduces risk of dirt or other contaminants getting into the fuel system. Spray under the deck with water under pressure to remove corrosive lawn chemicals and grass buildup. (if it's dry rotted, replace it, they're cheap). A worn Fuel Line Grommet will cause fuel to leak from the tank. It seals against the inside of the fuel neck. Best Answer: There is supposed to be a tiny pinhole in the top of the cap to vent the tank. I Start it up and just let it idle for as long as it would, ran for a bit and dies. Forgot to mention: Don't get carb cleaner on any of the rubber. 47 L (16 oz) oil through dipstick. Just when engine starts to sputter, unscrew the cap. The side tabs move and the larger hole in the middle of the bottom of the cap is clear, but down inside the hole in the middle it looks like there's supposed to be a second open hole of some sort. If a fuel leak is found, do not start or run the engine until • the fuel leak is fixed and spilled fuel is wiped away. Luckily, we have replacement Ariens gas caps that'll get the job done. If there is no light, replace it with a new air filter. Tip: If your fuel tank contains gasoline, remove the cap, cover the opening with foil or plastic wrap, and then replace the cap. The lawn mower repair pros I spoke with said they charge between $50 and $75 for a tuneup that includes the same tasks I performed. As an ideal replacement for lost or damaged caps, the Power Care 2-1/8 in. A portable fuel container (PFC) is a receptacle specifically designed to hold small amounts of liquid fuel. Having gas spew out the gas cap vent while you are walking behind is not a good thing. The engine will not fire if there is not enough fuel in the carburetor. Following these tips will help you to avoid most fuel related problems. I went to cut the grass again last night and the mower won't start, it will backfire after every 2-3 pulls. I think the lawn mower was not winterised. The pump is the part of the mower that will actually send the fuel from the tank to the carburetor. Toro 71429 lawn mower troubleshooting. Update: The gas cap did not have a vent in it, so I drilled a little hole in it. Obviously, it's cheaper to do it yourself, but you also need to factor in the time it takes to do the work and obtain parts and supplies — and whether it's something you actually want to do. Plugged air vent in fuel cap. Here are the most common reasons your Craftsman lawn mower starts then stalls - and the parts & instructions to fix the problem yourself. Check to see if someone has added plastic or another sealant to the bottom of the cap. When the cap is not tight it runs fine. Use a paintbrush to brush away particles and buildup on the fuel cap. Tiny hole in my mowers fuel cap? Posted by Matt on June 15, 2015 at 7:52pm in Landscaping Just recently bought a mount field empress 16 and when i started it up fuel was splurting out of this tiny hole on top of the fuel cap?. Manufactured by Exmark. Best Answer: Try this, when you run it and it dies, unscrew the fuel cap then screw it back on and see how long it runs. It only takes a second. Those allow the tank to vent through. A lawn mower gas tank leak is no laughing matter, but sometimes the problem is not that the tank is leaking, but that the tank is full to the brim and there is excess fuel coming through the cap vent. Once again, the carby and fuel lines etc. Later in the week I cut the grass again without issue. Place a plastic sandwich bag over the fuel tank opening and reinstall the fuel tank cap to prevent gasoline from leaking out through the fuel cap vent. When you tip over the mower, the fuel can flow into the carbon cap. Dryer lint escapes through tiny gaps around the edges of the dryer drum and falls into the cabinet, especially when the exhaust vent or vent cap is clogged and airflow is restricted. Drain fuel tank. I've narrored it down to the fact that the gas tank seems to no longer be vented. If you have broken or worn parts on your Craftsman lawn mower , replace the simple parts instead of buying a new mower. SMARTSTOW® allows the mower to be stored vertically, reducing the storage footprint needed by up to 70%*, and provides easier access for you to clean the under-deck and service the blade. If you spot debris in the gas tank or leaking gasoline, it's time for fuel tank maintenance. I’m going to bet your problems stem not from the gas in the oil, but instead from tipping the mower. If you need reassurance in verifying that this Gas Cap will fit your mower please don’t hesitate to call or email us. Loosen, but don't remove, the cap and try to run it. If mower doesn't start or it runs erratically, drain and refill tank with fresh gasoline and fuel stabilizer; clean out gas-cap vent. Yes; there can be other issues. Your helper back from 2008 is growing up. (if it's dry rotted, replace it, they're cheap). And got a bonus good laugh. Your Honda lawn mower is designed and manufactured to precise specifications to ensure years of troublefree operation. 75 horsepower rear discharg mulcher model #917. Push Mower Engines; Riding Mower Engines Fuel Cap Engine & Repair Troubleshooting Carburetor; Compression Stroke; Crankshaft; Flywheel & Key; Fuel Cap; Fuel. This can be tested by loosening the fuel cap and starting the engine. Allow engine oil to drain from the dipstick filler tube location into the drain pan. I have had a chance to test it and the RER-1000 is a great mower for 1/3 to 3/4 acre lawns. If any fuel is spilled, make sure the area is dry before starting the engine. Is the air filter dirty / plugged? Clean or replace the air filter. It is a Snapper rear rider mower and the manual refers to is as a vent that you should open after filling tank with gas. Re: Fuel tank cap vent - how to check/test? I took a closer look at the cap. Remove the spark plug lead and secure it away from the plug. When you are operating a self propelled lawn mower, then you will face various types of problem and need some maintenance work to make a solution for this problem. Symptoms of Problems. Place a plastic sandwich bag over the fuel tank opening and reinstall the fuel tank cap to prevent gasoline from leaking out through the fuel cap vent. Luckily, we have replacement Ariens gas caps that'll get the job done. Chainsaw Repair Lawn Mower Repair Lawn Mower Maintenance Mixer Audio Music Instruments Cutting Wine Bottles Garage Workshop Electronics Lawn mower or snow blower won't start? Use this Briggs & Stratton small engine repair guide for troubleshooting common problems & issues with small engines. The vent is a little screw on top of the fuel filter cap on the mower. If the engine starts when you remove the gas cap, a plugged vent hole is the problem. Start the trimmer and let it run in choke. Clean out dirt, grass, and debris from the top and underneath side of your mower deck after each use. These gas caps can get dirty or damaged when you. Vent in gas cap is plugged: Clear Vent. Just when engine starts to sputter, unscrew the cap. the mower's side vent, you can create a hazardous situation. Sometimes the gas cap can become broken or lost and you need to find a replacement or else gasoline can leak out or evaporate. I cleaned the air filter and plug. If it starts right up then clean the cap or replace it. sometimes its an air emmitance valve sometimes a vent in the fuel cap, Sovereign XSZ40 lawn mower. Cleaning Fuel Cap Vent cap. It's a pain to lose the gas cap. General Service. The Snapper 2811523BV (28-Inch) 11. re: Lawn Mower Gas Smell Posted by retired trucker on 1/1/16 at 8:58 am to RandySavage open garage door, remove lawn mower allow door to remain open, add fad to assist in stank removal close door go back in the house for a cpl hours to allow time for that stank to dissipate now go back n check if it's almost normal, it's the damn mower and you. If the engine still has trouble running and has a gas tank with a vent hole, the hole may have become clogged. Try starting the lawnmower with the filter removed. If the vent cannot be cleaned, replace the cap. Check the gas cap vent first. JOHN DEERE X300 LAWN TRACTOR Service Repair Workshop Manual provides step-by-step. Creators of the Toro 71429 lawnmower refer to this model as Wheel Horse XL 440H lawn tractor. Cap is hinged and riveted in placeI have been blowing air with a compressor into the Best way to clean vent in fuel cap. I read this post about your lawn mower issue and you all were f-ing hilarious! I was given a lawn mower with the same issue and now I believe I can restore this machine and resell it, thanks to this post. To do this, disconnect the spark plug cable and turn the mower on its side, spark plug up. Unscrew the tank cap. Briggs and Stratton Gas Caps available online from LawnMowerPros and ready to ship direct to your door. Once again, the carby and fuel lines etc. • Keep fuel away from open flame or spark and store machine away from open flame or spark or pilot light such as on a water heater or appliances. clean gas cap vent? My snowblower ran awhile then stalled then stopped. Notice the small holes. If there is no light, replace it with a new air filter. how do i know this? many many years ago my mowers vent cap malfunctioned and quit venting. Initial Review: The old gas cap for my snowblower had lost it's venting capability. Manufactured to meet OE specifications, this gas cap fits most lawn tractors manufactured by MTD. When replacing the Grommet it is advisable to replace the fuel lines at the the same time. The Fuel Line Grommet is placed into the fuel tank. Nick, You did not state your model #,, so this will be some what generic answer. Seems there is a baffle in the cap to allow the tank to vent and to close off to prevent fuel leaking. Having gas spew out the gas cap vent while you are walking behind is not a good thing. don't get burned by high mower parts prices and don't play around with your safety with a leaky gas tank. will need attending to. My mower started running perfect the second I unscrewed the cap. The delivery came in two days. Mowing Safety 101. There is a vent in the cap for your fuel tank to prevent vapor lock. JOHN DEERE X300 LAWN TRACTOR Service Repair Manual 1. A lawn mower repair shop will drain the old gas from the mower, replace the air filter and spark plug and perform basic diagnostic tests. Even with priming the fuel line up to the pump, I can't get the pump to move fuel when I crank it. how can i adjust the air mixture? you can smell gas a little bit and the smoke is black. Mower starts easily but after 5 mins use misfires and dies. With an engine that dies in 10 minutes, it's usually the gas cap vent plugged and no allowing air in the tank to replace the fuel used. You can avoid expensive repairs to your. As such, when using the gas cap, the motor would sputter and eventually konk out. Keeping Your Lawn Mower Clean For a rotary mower, clean the mower deck and engine housing after each use. Be sure to take care of any problem you find, or have your servicing dealer correct it, before you operate the lawn mower. Engine is overfilled with oil: Drain oil and fill to proper amount. For a quick turnaround, take your mower in at the close of the mowing season or before spring grasses start to grow. i may do this next as i feel i'm running out of options and need the mower to work this season. I would go back to the reel mower. Notice the small holes. Vent hole in fuel cap is Clean or. If your tank is full when you tip it, fuel can leak out the vent. Locate your John Deere Gas Cap part number below to order Fuel Caps. should be no fuel in the filler neck). After that checks out I'd look at the carb. For motorcycles, remove the petcock, gas cap, and all hoses that might be attached to it. Available on select models. Step 7 of 9. • Allow engine to cool before storing machine inside a building. Your Riding Lawn Mower Tractor. Start the trimmer and let it run in choke. JOHN DEERE F725 FRONT MOWER Service Repair Manual 1. don't get burned by high mower parts prices and don't play around with your safety with a leaky gas tank. Check the vent of the gas cap to be certain that it is clear. Before closing the fuel cap, inspect for blockage and replace it if there’s blockage. Place a drain pan on the left side of the mower. If you see these missing then they're probably in the tank and need to be removed and you need to replace the cap with Tecumseh part number 37845. What confuses me is that there is no vent on the tank or the gas cap, I took the tank off and examined it. To see if this is the problem, slightly unscrew your gas tank so that air can get into the fuel tank, then try to run your mower, if this works, you. Millions of quality OEM replacement parts, repair videos, instructions, and same-day shipping available!. It is also designed to vent excess heated gases to keep the right amount of pressure, which allows the fuel to be pumped into the carburetor via the fuel line. Take a small pick and dig out any trash if not drill a tiny hole in the cap. Chainsaw Repair Lawn Mower Repair Lawn Mower Maintenance Mixer Audio Music Instruments Cutting Wine Bottles Garage Workshop Electronics Lawn mower or snow blower won't start? Use this Briggs & Stratton small engine repair guide for troubleshooting common problems & issues with small engines. Just when engine starts to sputter, unscrew the cap. msrp of 79. Hysterical but effective. Use the same technique on the air filter—if it cannot be adequately cleaned, it should be replaced. The most common reason a lawn mower dies is bad gas, but a loose plug wire will cause it to stall too. If the engine still has trouble running and has a gas tank with a vent hole, the hole may have become clogged. I would go back to the reel mower. It started just fine the past 3 months. msrp of 79. Vapor lock will prevent gasoline from flowing from the tank into the fuel line. Loosen, but don't remove, the cap and try to run it. Bonus cleaning tips for lawn mower owners: After every use, be sure to clean the lawn mower's undercarriage. Your Honda lawn mower is designed and manufactured to precise specifications to ensure years of troublefree operation. After that checks out I'd look at the carb. It has several features that make working with this lawn tractor easier, for instance the possibility of adjusting the front-to-rear blade slope, setting the height of cut etc. It only takes a second. TM2308 JANUARY 2011 JOHN DEERE WORLDWIDE COMMERCIAL & CONSUMER EQUIPMENT DIVISION January 2011 John Deere Select Series™ Tractors X300 Series TECHNICAL MANUAL North American Version Litho In U. There is a 5-year warranty that covers Top 195 Reviews about Toro Lawn Mowers. Video showing a gas cap that is not venting causing a fuel starvation problem. Blocked fuel line or stale fuel: Clean fuel line and fill tank with fresh gas. a new carb is about 150 bucks. Keeping Your Lawn Mower Clean For a rotary mower, clean the mower deck and engine housing after each use. Let it sit for an hour and get same results. Check the screen in the tank and the gas cap (vent). Replacement Gas Caps for John Deere outdoor power equipment, including John Deere commercial equipment. If you're worried about fuel leaking out, place a small piece of plastic under the gas cap before tipping the mower onto its side. If that isn't it, then it might be a heat induced ignition problem. Try to get rid of any junk on the mower's underside as well. When I turn my mower on the side, gas leaks from the gas cap. After a 2 second (plugged) delay, the blow-out through the roof vent produced a lint debris field that looked like the lawn mower ran over a beach towel. The vented gas cap is designed to vent small amounts of air into the car gas tank line. However, on the new cap there is no floating piece nor hole. The plug and clean. Spray under the deck with water under pressure to remove corrosive lawn chemicals and grass buildup. how can i adjust the air mixture? you can smell gas a little bit and the smoke is black. Squeeze the clamp holding the gas hose to the side of the carburetor with th. *Space savings are in relation to the space consumed by a Toro® 22” Walk Power Mower that is stored with the handle in the standard operating position. Fuel caps have very small vents on them that allow some air to get into the gas tank, this is vital for proper function. It started just fine the past 3 months. At the end of the season, run the mower to empty the tank, or add fuel stabilizer to the tank to winterize your mower. I fired it up and it did the same thing. The gas hose will be clamped to the base of the gas tank and run to the side of the carburetor. Drilling a hole in the improvised cap will fix the problem. I removed the tube on the tank side, and got gas all over my hands, so that's not clogged. How do I clean a gas cap vent Tech Line. Actually, OP, the tiller looks to me like it's in good condition, you may need to clean some varnish out of the carburetor (frequently it's enough to take the float bowl off and spray off the jets with carb cleaner) but otherwise maybe change the oil, figure out the belts (may make sense to take the tiller to a good parts store so you can check what actually fits) put some non-ethanol gas in. Do not use a nozzle lock-open device. Check gas tank cap,vent hole in same may be plugged or cap bad,try running with cap loose & see if that cures problem,other possibility tank has a load dirt/water in bottom,plugging outlet with vibration,if tractor has a shutoff valve between tank/filter check valve,may have dirt in it or valve going bad. Replace it if it's too dirty to clean. I don't know if it has it or not but I have seen a few of the super quiet mufflers get clogged from crap. FUEL GAS TANK Honda GCV160 GCV190 Engine lawnmower NO GAS TANK CAP Selling a FUEL GAS TANK Honda GCV160 GCV190 Engine lawnmower WITH NO GAS TANK CAP. a new carb is about 150 bucks. Fuel caps have very small vents on them that allow some air to get into the gas tank, this is vital for proper function. The gas hose will be clamped to the base of the gas tank and run to the side of the carburetor. If the pressure of a gearbox rises above the designed limit during an operation, the unit will allow pressure to vent out to prevent a build-up. Posts about riding lawn mower written by R. This helpful video from Sears PartsDirect explains how to tune up a walk-behind lawn mower, and how to clean the exhaust, controls and engine cooling system to keep the engine at its best performance. I have a John Deere STX38 riding mower. There are gas caps for almost everything that uses or carries gasoline — from your automobile and lawn mower to the gas can you fill up when you run out of gas. Do you want to try your hand at more DIY mower repair and lawn mower maintenance or learn about Snapper's latest products?. Remember to take photos before removing springs, levers and gaskets. That will slow or stop the fuel flow and stop your engine. I tend to agree with our K9handling buddy that (the smallest possible) holes should be quite sufficient to vent the tank, however I cannot drill in the side of the gas cap because, when you look at a Porsche screw-in type cap, any hole on the side of it (w)(c)ould, I reckon, be physically blocked-off sideways by the very tube it is screwed into. Clogged fuel pumps can affect a lawn mower's ability to operate. However, on the new cap there is no floating piece nor hole. and the mower deck. it will start, run about 10 seconds and then cut off again. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. While on vacation years ago my wife complained her Mom’s dryer took too long so I tried the leaf blower trick. A plugged carburetor. The cover is also vented to promote air circulation while minimizing heat and moisture build-up. If you spot debris in the gas tank or leaking gasoline, it's time for fuel tank maintenance. The vent is located above the hex mid-section, and after the pressure is relieved, the gearbox can continue working without interruption. If you do not see the Kohler Part you need, please complete the Lawn Mower Parts Request Form and we will be happy to assist you. My grandfather bought a brand new 1 for his ( Lawn General branding ) leak got really bad and of course poured gas all over the motor when it let go ( no fire tho ). Shop briggs & stratton fuel tank cap in the small engine replacement parts section of Lowes. When you tip over the mower, the fuel can flow into the carbon cap. Replacement Gas Caps for John Deere outdoor power equipment, including John Deere commercial equipment. The containers can range in size from one quart to five gallons or more. Open as PDF Clean fuel line; fill tank with clean, fresh gasoline. com Briggs & Stratton Fuel Tank Cap at Lowes. Though lawn mower safety is something that may be taken for granted, it is still of the utmost importance. Remove the spark plug lead and secure it away from the plug. There is a vent in the cap for your fuel tank to prevent vapor lock. Take a small pick and dig out any trash if not drill a tiny hole in the cap. Take the cap off and clean it with the brush, using warm, soapy water. It looks like there are two small vent holes on the gas cap itself. Vapor lock will prevent gasoline from flowing from the tank into the fuel line. Look on the inlet side of the muffler to see how wet it is. There is a small vent hole on the cap that also controls the flow of air into the gas tank and ultimately the flow of air into the carburetor, so continued sputtering problems may be the result of a clogged vent hole. I read I should try opening the gas tank cap half a turn or so and try it then, that maybe the cap wasn't venting (plugged or clogged?). It has several features that make working with this lawn tractor easier, for instance the possibility of adjusting the front-to-rear blade slope, setting the height of cut etc. Don't leave gas in your equipment for more than two weeks. Remove spark plug, remove fuel line from carburetor and direct line into a container to see - Craftsman Riding Mower. Use a clean air filter. Do not use a nozzle lock-open device. Pop the pin out that pivots the cap. Refill with clean, fresh gasoline. Clean area around filler tube. FUEL GAS TANK Honda GCV160 GCV190 Engine lawnmower NO GAS TANK CAP Selling a FUEL GAS TANK Honda GCV160 GCV190 Engine lawnmower WITH NO GAS TANK CAP. Having gas spew out the gas cap vent while you are walking behind is not a good thing. The gas cap on a Poulan chainsaw covers the tank and keeps gas from spilling while you cut. Step 7 of 9. When you are operating a self propelled lawn mower, then you will face various types of problem and need some maintenance work to make a solution for this problem. As for this problem with kohlers you don,t bother wasting time with gas cap air vent restrictions , when experience and symptoms obviously dictates the problem with George's 159 Toro is coil related , although just loosening the cap would validate your position , rather than advising someone to poke at the rubber air vent poppet. Have already changed oil, spark plugs, gas, fuel filter, air filter and fuel pump. If everything else mentioned is good, check that if it has that style. What can you use to clean a lawn mower gas tank? What is wrong if gas leak from vent hole of gas cap on lawn mower even after caps have been replaced It is so bad that gas runs down over tank. Do they have some new way of venting gas tanks for enviromental reasons or something. Water or dirt in fuel system. Able to mow and mulch, this lawn mower has high-quality smart features and proven dependability. If any fuel is spilled, make sure the area is dry before starting the engine. for carburetors with a drain plug, siphon/dump the gas tank, remove the drain plug and drain the fuel, then pull start a few times to run out whatever fumes may be left and then store. To clean your air filter, tap it to remove lose debris.