The air filter may be clogged or dirty. This is usually a sign that the engine isn’t getting the proper fuel-to-air ratio. If the carburetor is clogged, try cleaning it with carburetor cleaner. Reinstall carb and fuel lines and air cleaner. He knows exactly what the challenges are to nurturing a thriving yard in difficult soil. Read more. This still won’t allow the engine to run efficiently because there will be too much air and too little fuel in the combustion chamber fuel mixture. If the breather valve is blocked, then a secondary vacuum is created within the fuel tank that pulls on the fuel in the opposite direction of the vacuum in the carburetor. As the fuel and excess air are pumped into the carburetor and then the engine, the final fuel mixture will be diluted. I have a Ryobi BP42 Leaf Blower. Leaf Blower Won’t Stay Running. If the rings leak either way the engine will not run If the exhaust is blocked (mud pluggers) the engine will not run If the barrels are scored the engine will not run When you turn on your leaf blower, you generally need to engage the choke to get the engine to keep running while it’s cold, but if you cut off the choke only to have the engine die, too, your leaf blower’s engine may have an underlying issue. Time required 60 minutes or less. My Ryobi 340BV blower ran fine all during the fall. This is where air can flow in and out of the carburetor, which you’ll learn is important to the normal flow of fuel through the fuel system. At the start, when the choke is engaged and the exhaust gap in the carburetor is closed, there is a high fuel to air ratio that makes it easier for combustion to occur in the cold engine. Steve’s Small Engine Saloon has an excellent video demonstration on this process. Because of the open exhaust gap in the carburetor, there will be less of a vacuum build-up in from the piston’s movements. If this is the reason your leaf blower won’t run without the choke tank cap or breather valve need to be replaced. 39,107 satisfied customers. Just because your leaf blower won’t start doesn’t mean it needs to be replaced completely. After refueling it will only run for about 5 to 10 seconds and then stops. If a leak is identified, do not use the leaf blower until you replace the line or have it professionally serviced. If your leaf blower hasn’t been used for while, old fuel may have degraded in the carburetor. Product recommendations not personally owned are based on the author’s knowledge of the company, product, reliability, and reputation. If the crankcase seals do not hold pressure & vacuum the blower will not run. Always use common sense when working with a gas-powered engine. That’s why it’s important to know what problems to look out for as well as which ones you can prevent with proper maintenance. This sticky fuel can clog up the carburetor and cause the engine to stall. View solutions. If you are uncertain about the age or mixture of the fuel, empty the tank and refill it with a proper mixture. I shut it down for a few minutes and it wouldn't start back up. We carry more than 4 million parts from over 175 major brands, so chances are, we've got the part you need. Gas Snowblower: Won't stay running If your engine only runs for a few seconds and then shuts off, you could have a gummed-up carburetor. I can get it to start just fine and it will go to full RPM when I hit the throttle but weather it is full throttle or just idle, it will kill after about 5-7 seconds or so every time. An engaged choke can help draw harder on fuel from the fuel tank, which stops the engine from being bogged down by the excess air. A clogged carburetor is most commonly caused by leaving fuel in the leaf blower for a long period of time. Final Words on How to Fix a Leaf Blower That Won’t Start. That is, as long as you leave the choke on. What could be the problem and what should I try? Leaf blower won't start. Depending on the model of your leaf blower, there will be screws on the carburetor that allow you to fine-tune the air-to-fuel ratio. Location: Mi-Wuk Village; Read more... blower vacuum Ryobi leaf Sponsored Link Start doing it yourself with the confidence that comes with 100+ years of experience. That will cause the amount of fuel in the air-to-fuel ratio to be too low. Carb needs a rebuild kit. As the pistons begin to cycle up and down, these movements physically draw fuel through the carburetor’s fuel line as the engine pistons create an air vacuum (source). Towards the end of the season, I had started it multiple times over the course of a couple of hours, so it was fully warmed up. In most cases, it just requires a little maintenance and it will be back to running like new. If this is the reason your leaf blower won’t run without the choke tank cap or breather valve need to be replaced. This warping will cause the fuel to stop moving through the entire circuit, and the engine will shut off. Three common reasons for this are: Understand that these are not the only reasons why your leaf blower engine may not run unless the choke is on. Usually this happens when the engine starts heating up, as the diaphragms aren't completely shot … To understand how and why these issues occur, you need to know what the different parts of your leaf blower’s fuel system are as well as how they work under normal conditions. Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! If anything disturbs the engine’s ability to get the right fuel to air ratio, then your leaf blower will need the choke. Repair difficulty. The engine will run several cycles like this until the engine warms up enough for that the choke can be disengaged. Or it might even run rough. I replaced the lines properly. View solutions. Rotate the idle speed screw clockwise until the blower starts blowing on its own. Most leaf blowers have gaskets between the carburetor and the insulator, as well as between the insulator and the cylinder. A lot of times the nuts or bolts that hold the 'jug' on the crank case come loose allowing too much air in the cylinder causing too lean a fuel/air mixture and hence having to run it on choke all the time. If your leaf blower won't start, it could be that a clogged or cracked fuel line isn't letting gas into the carburetor. View solutions. The best way to test which is the faulty part, is to take your battery down to your local store that sells Ryobi 40V tools and try it on one of their chargers. The compression of the engine’s pistons allows fuel and air to flow through the carburetor in specific ratios for each cycle (source). A. Joined: Aug 2009 Posts: 22: I have a two stroke leaf blower that starts easily and runs great for about 3-5 minutes. It sounded like the engine was very weak. Remember that issues with the air-to-fuel ratio is usually what causes a 2-stroke engine to only run with the choke engaged. A. a1handy OP newbie a1handy OP newbie. … read more. Amazon has put together some great Home Holiday Guide Deals - save money and get your holiday shopping done! It runs great - IF you can get it started. Your spark plug can be damaged in several ways. Electric leaf blowers are a straightforward piece of equipment that many gardeners use. 05 - Air Filter. Total blockage of the breather valve won’t allow the leaf blower to run, even is the choke is engaging, but a partial blockage will because only a small vacuum will form in the fuel tank, limiting but not starving the engine’s fuel intake. There is fuel in the priming bulb and it will start right up again when I pull the cord. I have a Craftsman Blower/Vac Mulcher. I have a model # 358.797340 25cc 205mph craftsman leaf blower/sucker. Starts but won´t stay running... has all attachments including leaf vacuum bag. If one is not working properly, the problem will be small and probably not difficult to locate. Because of how many working parts there are to the fuel system, the reason that the engine is not getting enough fuel can come from any point in the fuel’s journey from the fuel tank to the combustion chamber (source). leaf blower Wont stay running. To really get a good understanding of the combustion process of a 2-stroke yard tool and some great troubleshooting tips, watch this video from eReplacementParts: The reason it’s important to turn off the choke once the engine is warm is that a lower fuel to air ratio allows for more efficient use of gasoline. Leaf Blower Fuel Filter . Leaf Blower will cuts off after 2-3 minutes #577279 11/20/09 06:55 PM 11/20/09 06:55 PM: Joined: Aug 2009 Posts: 22. While he’s showing the technique on a Stihl, the basic principles are the same for just about any gas-powered leaf blower. Already ordered? If old fuel was left in the leaf blower, drain the old fuel from the fuel tank and replace the fuel filter. Associate Degree. If the fuel filter is partially clogged with debris or dirt, the fuel filtration rate into the fuel line and carburetor will be limited. Leaf blower won't stay running. The carburetor might be clogged. 11 possible causes and potential solutions . Shipping all 7 days! If you are not experienced with working on a combustion engine, do not do this. A McCulloch chain saw that won't keep running may have a major problem. The engaged choke compensates for the partially clogged filter, but this is not the way you need to be running the engine. Depending on the different symptoms you will need to troubleshoot, so that you don’t have a dispensable leaf blower in your hands. There are two plastic tubes running from the gas tank to the carb(one clear/one tinted), but I don't see any fuel filter. It was running fine, then would just run for 5 seconds and die. Report This by Manage My Life. SHOP PARTS. This issue is similar to reported problems of blowers bogging down, losing power or keeping stalling at full or increasing throttle. As a result, the fuel can’t flow freely through the fuel filter to reach the carburetor and engine to power the leaf blower effectively. Curtis B. Paul has a two-acre yard on red clay soil in Southeast Texas. Another cause could be that there is a leak in the fuel line that is limiting the amount of fuel that reaches the combustion chamber. What to Do When a Ryobi 4-Cycle Trimmer Won't Start. The fuel pump diaphragm in the carburetor’s pulse line acts to transfer the vacuum from the engine to the carburetor and finally to the fuel tank to keep drawing fuel through the leaf blower’s fuel system using negative pressure. Why does my leaf blower only run on choke? Ryobi gas blower /vacuum. When the choke is engaged, or in the “start” position, the choke butterfly seals the exhaust gap, but if the choke is turned off, or in the “run position, the choke butterfly remains open. Leaf blower starts then dies. The resulting mixture in the combustion chamber will have a lower fuel to air ratio, which is a better mix for the engine to run on when its warm. At best, it will run at half throttle, but never at peak rpm. If you notice one of your blower’s gaskets are damaged, they will usually … Remember that when you engage the choke, it closes the exhaust gap in the carburetor and allows the air vacuum from the engine piston action to build up stronger. No Video Available. Have a blower that starts but won't run off half choke ... hello, my Ryobi leaf blower (back pack type) pull cord is stuck. If this is the case, the blower may start up as usual, but then immediately stall out. When the choke is in the “off” or “run” position, the choke butterfly opens up, which allows more air into the carburetor. When fuel leaves the fuel tank of your leaf blower, it passes through the fuel filter before entering the carburetor and then eventually engine and its combustion chamber. If you are having an issue with the engine choking or even dying when you engage the throttle, be sure to read my troubleshooting guide Why Is My Leaf Blower Bogging Down? It runs great - IF you can. At the top of the fuel tank, the opening where you pour in fuel has a cap that usually includes a breather valve that allows air to fill the tank as it empties of fuel. Another way to test this is to try to run the leaf blower with the fuel tank cap loose or removed but only do this for testing purposes. I have a Ryobi BP42 Leaf Blower. Easy repair to keep this boss in the game. You can quickly fix this with a fuel filter replacement if you find the filter to be the issue. String trimmers are versatile tools in any homeowner's arsenal. He takes a practical approach to yard improvement and enjoys putting best practices and “golden rules of lawn care” to the test. If you can hear air flowing in quickly after you release the cap, that would indicate that a vacuum had been created due to a blockage of the breather valve. No Video Available. Thriving Yard is a privately owned website. There can be a number of underlying issues but these are common causes and each of them has a fairly simple solution. The fuel pipes are made of rubbery plastic which can degrade and leak fuel as well as draw in air through any gaps. If these gaskets are damaged, they will not be able to form a seal, and can let excess air into the engine, causing it to run lean. Enter model number to search for the required part specific to your product. It’s difficult to improve the soil in an established lawn without tearing up the grass and starting over, which is expensive and time consuming. Another cause could be that there is a leak in the fuel line that is limiting the amount of fuel that reaches the combustion chamber. I did not replace the filter. Examples provided of tested products are actual products owned, tested, and used regularly by the author. Here's a routine to check your leaf blower from plug to mouth. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. No Video Available. The degradation of the … These diaphragms can warp after several seasons of use. Stale fuel is the most common reason why a leaf blower won’t start. Take it to a professional for servicing. Required Part. Gas powered Leaf blower problem - It will not stay running. Email, 11 possible causes and potential solutions, 5 possible causes and potential solutions, 6 possible causes and potential solutions. Read more. This site is a participant in affiliate programs such as Amazon Associates and earns from qualifying purchases. 6 possible causes and potential solutions . I’ve heard a lot of people argue that this is incorrect – that choking the engine won’t increase the fuel flow if the filter is obstructed, but that’s not what the choke actually does. November 1st, 2012. The fuel filter is located at the end of the fuel line inside the gas tank. Craftsman model #358.797342 - It ran ok approx 1 week ago and then it ran out of fuel, 40:1 ratio. Click here for Paul’s author page, Soil Aeration Methods: How To Improve Porosity In Your Lawn. Thriving Yard is an affiliate for companies including Amazon Associates and earn a commission on qualifying purchases. Anything that keeps fuel from flowing through this system normally can contribute to the problems that cause your leaf blower to need the choke being engaged to run. The exhaust gap’s opening is controlled by the choke butterfly. This creates a bigger pull on the fuel coming through the fuel tank, which can allow enough fuel to be drawn through the clogged filter for the engine to run. High ethanol content fuel in this article may help you to identify cause! Programs such as Amazon Associates and earn a commission on qualifying purchases engine Saloon has excellent. Of experience supply the engine dies if a leak is identified, do not use leaf... 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