With these videos I hope you are able to fix and repair your lawnmower yourself with minimal parts, knowledge and tools. Manage Settings The only exception is worn-out or damaged hoses. As a result, you may notice that the primer bulb fills with gas when you press it. Both help the engine start more easily, especially if it has been sitting for a while or it is cold outside. Next, check to see if the primer bulb is firm. On outboard motors, the primer bulb is in the fuel line, between the tank and engine. Remove the old bulb by squeezing its mount tabs. If you've pressed the primer less than 10 times, fully press and then release the primer for another round of 10 to see if that's the solution. Thats the reason I am here to explain how does a primer bulb work on a chainsaw in detail today. Its ultimate purpose is to prime the carburetor. To use the fuel bulb, first make sure that the engines stop switch is in the off position.Then, unscrew the cap on the fuel line and connect the hose to the barb fitting. Overall, a primer bulb is an important component of an outboard motors system and helps ensure that it starts quickly and runs smoothly. Many handheld tools and other equipment have the primer bulb connected to the carburetor through a hose or line and port. This website uses cookies to improve your experience while you navigate through the website. The primer bulb also helps to reduce air bubbles in the fuel line, which can cause problems with starting or running your outboard motor. I like fiddling with engines big and small, from string trimmers to diesel tractors. The engine then draws in this fuel and uses it to run. However, you may have a leaky or broken primer bulb. By raising both simultaneously, you can often get the fuel to start flowing through the injection pump again. ALL RIGHTS RESERVED! First, check to see if there is fuel in the tank. A quick video tutorial on HOW TO Replace a Primer Bulb / Button on a 5 Horsepower Briggs and Stratton Engine. Engine is hard to start If you find that its taking longer than usual to get your boat engine started, or if it requires more cranking than normal, this could be a sign that the primer bulb isnt delivering enough fuel to the carburetor. A primer bulb should be in pristine condition to work flawlessly. Most small engines will not start if the carburetor is dry. 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Pressing the primer only a couple times should supply enough fuel to mix with air in the carburetor, and be ready for combustion. This helps to prime the engine, which means that it will start more quickly and run more efficiently. The primer bulb has air bubbles in it. They consist of just a few help topics so far but I am continually making more of these Free Downloads. However, if the primer bulb, its seal, and plate are fine, you are looking at one of the other causes and therefore fixes explained here. Web when the bulb is squeezed, a vacuum draws fuel from the fuel tank through the fuel lines and into the bulb. Your existing light switch, when kept switched on, will continue to supply power to your smart bulb. Here you will find a vast library of easy do it yourself repair videos for all types of small engine equipment like chainsaws, weed eaters, hedge trimmers, brush cutters, leaf blowers, lawn mowers, pressure washers, generators, riding lawn mowers and so much more. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The carburetors metering unit or chamber should be flooded as you prime the tool for the fuel to flow into the primer bulb. When you squeeze the bulb, the inlet valve opens to allow fuel to enter the bulb while the outlet valve remains closed. Replacing all components such as gaskets and fuel lines is always recommended when rebuilding or repairing equipment. First, you need to remove the screws and get rid of the faulty air bulb. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Screw-in primer bulb functions in a similar way to the snap-in primer bulb but has a different attachment mechanism. A screwdriver A pair of pliers How It Works. How to Prime the Mower in The Absence of the Primer Bulb. The primer bulb is where it enters the carburetor. So you press the purge bulb to force the air out and get the fuel flowing properly. 322166814/www.reference.com/Reference_Mobile_Feed_Center3_300x250, How My Regus Can Boost Your Business Productivity, How to Find the Best GE Appliances Dishwasher for Your Needs, How to Shop for Rooms to Go Bedroom Furniture, Tips to Maximize Your Corel Draw Productivity, How to Plan the Perfect Viator Tour for Every Occasion. The same inspection can tell you if there is leakage, blockage, or both. Patrick McMann works as a hardcore tester and reviewer for Chainsaw Guru. These cookies ensure basic functionalities and security features of the website, anonymously. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. This site is an affiliate for companies including Amazon Associates and earns a commission on qualifying purchases. Fuel leaks A damaged or cracked primer bulb can cause fuel to leak from the carburetor area. Get a new compatible primer bulb, connect the in port to the carburetor and the out port to the return fuel line going to the tank. As an Amazon Associate, We may earn from qualifying purchases. Thus, use a carb cleaner to flush out every bit of debris, grime, or gunk inside the carburetor. Then, inspect the valves, gaskets, diaphragms, and ports to ensure they are alright. Some primer bulbs have a one-way valve that allows fuel to flow in one direction only. This helps to prime the engine, which means that it will start more quickly and run more efficiently. If your 4 stroke outboard doesnt have a primer bulb, dont worry theres no need to add one.Some models simply dont use them. What is that thing? Does the primer bulb go before or after the filter? On many small engines, this involves pulling the starter rope, although some small engines have an electric starter. If youve ever wondered whether a 4 stroke outboard needs a primer bulb, the answer is yes! The engine starts but runs poorly. A primer bulb is a small rubber bulb near the carburetor that can be pressed to prime the engine before starting it. Disclaimer: The information provided on this website is intended for educational purposes only and should not be used as a substitute for professional advice, judgment, or personal experience. You see, sometimes air gets into the fuel line of a Craftsman chainsaw and makes it hard for the engine to start. The most common issues are: CloggingStuck valvesFailing or broken metering parts, such as the: A carburetor has several channels to regulate the flow of fuel and air. All you need to do is change the regular, not-so-smart bulb in a light fitting in your home to a smart bulb. Is the primer bulb supposed to fill with gas? This valve is an important component of the fuel system and helps to regulate the flow of fuel to the engine. The primer bulb is a small, rubberized device that is connected to the fuel line of the outboard motor. If the bulb looks damaged, it will need to be replaced with a new one before the engine will run properly again. Finally, check the carburetor to see if it is dirty or has debris in it.If the carburetor is dirty, it will prevent fuel from flowing through and priming the bulb. There is no way that much pressure is put on a return line if there is a problem with it. How do I know if my outboard primer is bad? The owners and contributors of this website make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Here are the components of the carburetor primer bulb that play along to make the magic happen; When the bulb is squeezed, a vacuum draws fuel from the fuel tank through the fuel lines and into the bulb. The Purge Primer and the other style work on the same principle. Finally, check the carburetors metering unit to replace broken parts. Like the valves and hoses, the fuel filter in your tools gas tank may have gunk buildup. All primer bulbs have a one-way valve facilitating airflow and fuel through but not allowing either to return. You may consult a local technician about fixing a broken carburetor. The primer bulb is integral to priming, thus starting the tool's engine. A primer bulb, on the other hand, is a rubber bulb that you squeeze to add fuel to the carburetor before you start ignition. How does it work? Note: The primer bulb does not pressurize the gas tank. As the bulb expands, the inlet valve closes, and the outlet valve opens, allowing fuel to flow into the carburetor. Steves Small Engine Saloon Inc. assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. To the point, fantasy baseball is a game where people act as general managers (and/or owners, if you will) of virtual baseball teams. Replace it according to the owner instructions. Some of the fuel in the float bowl can be displaced by a small amount of air. The primer bulb needs to beprimed again after the engine is turned off. Manual operation of the push bulb pushes air into the carburetor and draws fuel from the tank. If there are any cracks or holes in the rubberized material, then you should replace it as soon as possible. It usually only takes a few pumps. ALL MODELSMusic by my band BonzaiRod - \"She's a Lady\"PLEASE KEEP IN MIND when you are watching my videos: I am showing you the least expensive, quickest \"backyard\" methods for repairing or servicing your lawnmower. If the primer bulb is not working, you may need to troubleshoot it. If the tank was full of water, it would cause a small amount of pressure in the fuel line if it had more fuel than the return. Pressing the primer a few times before starting will deliver the fuel. *New High Quality Primer Bulb For 694394 Lawn Mower Accessory * brand new and high quality *Made of high quality material, durable and practical to use *Highly matched to the original device *Sturdy and durable, long service life *Color: As pictures show. I have explained everything from the working of the primer bulbs to all the other questions that may knock your mind. So if you are experiencing problems such as your Chainsaw Wont Start or any other conventional Two Stroke Engine for that matter, or you just want in increase your knowledge, then this channel will certainly help you along the way!All 2-Stroke Carb Episodes: https://www.youtube.com/playlist?list=PLrlXp3PlwgRI5OLvm3P91LJr1CYnO5TRDUniquely explained like never before, this video will give you a firm understanding of how the primer bulb and primer system works on a two stroke carburetor. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. There is enough gas in the engine to start with the help of this suction. By doing this, it allows the engine to start and run without having to use the electric starter. If there are any blockages present, then they should be cleared before attempting to start your outboard motor. Cleaning the carburetor in the previous step will get rid of any grime and gunk clogging these valves. Air is pumped into the float bowl when the primer is pressed. Precautions and Safety Measures, How to Cut Wood Slabs with a Chainsaw in Simple and Easy Ways, Can You Rent a Chainsaw at Lowes? 2. Fortunately, replacing a primer bulb is a relatively easy task that anyone can do with a few simple tools.To replace the primer bulb on your outboard motor, youll need: If there is no fuel, the primer bulb will not prime.Second, check the fuel line to see if it is kinked or blocked. Unscrew the plate from the carburetor, remove the old primer bulb, and install the new one. Shop LED bulbs. The purpose of the primer bulb is to ensure that there is enough fresh fuel in the carburetor to start the engine seamlessly. The most common reason is that the boat has been sitting in storage for too long and the primer bulb has dried out. Some of the primer bulbs have a hole in them. The cookie is used to store the user consent for the cookies in the category "Other. This is not only a fire hazard, but can also lead to expensive repairs if left unchecked.3. Technically, priming is the process of providing the carburetor with sufficient gas so that the fuel and air can mix and be ready to combust when you start the engine. The primer bulb is a long-lasting part of the chainsaw. Want to learn more? Also, you may opt for ultrasonic cleaning and compressed air. Look for debris buildup inside. In this case, you should take your outboard motor into a qualified mechanic for inspection and repair as soon as possible. Primer bulbs connected to the return fuel line and the carburetor have the one-way valve on the out port. Its like snapping together two puzzle pieces! The best way to find the correct part is to check the owner's manual that came with your lawnmower engine. If your outboard primer bulb is bad, youll likely notice one or more of the following symptoms: 9 Best Hand Saw For Cutting Softwood Sleepers. Furthermore, a primer bulb can also help prevent engine flooding. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The primer bulb goes after the filter for a reason. Therefore, you must replace a primer bulb thats: You can instantly spot visible cracks or other evident signs of damage. Thus, the filter will not allow fuel to flow out of the gas tank as it normally does. Fuel lines are flexible tubes that connect the fuel tank, carburetor, and primer bulb, as shown in the diagram. It isnt seating or drawing air into the discharge port. When you press the primer bulb, it creates a vacuum that draws fuel from the fuel tank through the fuel line and into the carburetor. Detach the fuel intake line from the primer bulb and the return hose from the carburetor. Make sure it is properly connected and sealed and that there are no leaks. If you want brighter, whiter headlights, then opt for one of our upgrades - we offer bulbs that range from 100% to 200% brightness, so check out our Halfords Advanced bulbs if you'd like bulbs that offer brighter light. Engine is hard to start - If you find that it's taking longer than usual to get your boat engine started, or if it requires more cranking than normal, this could be a sign that the primer bulb isn't delivering enough fuel to the carburetor. Broken or malfunctioning valves in a carburetor may or may not be replaceable in all tools. There is a small air pump in some of the Tecumseh engines. Remove according. Your primer bulb will not prime if the metering lever, pin, needle, diaphragm, and valve are broken, or any of these parts are not working normally. Since the primary function of the primer bulb is to regulate air pressure and suction, it cannot have any leaks, cracks, clogging, or structural issues that make the part ineffective. It's often located just behind the starting handle, and you should press it 10 times when cold-starting the trimmer. In order to protect them from damage, primer bulbs are usually placed in the air filter housing. It is possible for the engine to start with a remote source of fuel. So always ensure that you properly clean your chainsaw before storing it since leaving them with filled oil tanks and contaminated filters can cause your primer bulb to malfunction. However, modern chainsaws have two primer check valves on the base. Inspect the primer line for the primer pump and check for any cracks or debris. Should the primer bulb stay hard? If you notice that your boats primer bulb isnt working properly, there are a few potential causes and symptoms to look out for. We work hard to protect your security and privacy. Debris buildup or clogging is remediable with carb cleaner, and replace the broken parts of the metering unit. The first thing you should do is check the valves and gaskets. Check if gas flows out of the fuel intake line. If the bulb develops leaks, air begins to replace the fuel in the line, causing the engine to run rough or stall. Inspect the carburetor and clean all its: Inspect the diaphragms and remove grime or residual buildup if you see any. You also have the option to opt-out of these cookies. It does not store any personal data. When the bulb is pressed and released, it creates a vacuum that draws fuel into the intake line, which then deposits it into the carburetor. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Insert primer bulb into retainer and moisten inside diameter of primer bulb. If your Mercury FourStroke outboard is 75hp or greater, the onboard electric fuel pump will prime the fuel . Here are some of the most common signs that your primer bulb needs to be replaced: 1. First, connect the fuel line to the engine, if not already attached, then pump (squeeze) the bulb repeatedly until it's firm. The primer bulb is attached to the back of the air filter assembly. By making sure that your primer bulb is in good condition and using fresh fuel whenever possible, you can help ensure that your outboard motor runs at its best performance level at all times! The consent submitted will only be used for data processing originating from this website. When you squeeze the primer bulb, it creates . Unplug the fuel intake line from the carburetor. If a primer bulb is fastened directly onto the carburetor, the compression and reversion force fuel into the device. For some tools, you may have to get a carburetor rebuild kit if each component is not available separately. When the bulb is firm, the line is charged and you can start the engine. This is because the carburetor isnt getting enough fuel to keep the engine running smoothly.3. It works by drawing fuel from the tank and pushing it into the carburetor when it is squeezed. You can use compressed air or an appropriately sized poking tool. A primer bulb vanishes this trouble from your life! Inspect the primer bulb closely under a bright light to find any tiny pores causing air to leak. Package Contents: 1*Primer Bulb. Press the primer seat into the bore with the groove on seat facing out. This fuel line returns the gas to the tank. How to start a Poulan 2 cycle chainsaw? For arborists, time is money, and a chainsaw that doesnt start quickly or makes excessive noise can be frustrating and slow down their work. A leaking or damaged primer bulb that is fastened directly onto the tools carburetor is not a serious problem. Engine power is decreased.If youre experiencing any of these issues, its a good idea to check your primer bulb to see if its the source of the problem. Replace the broken valve or diaphragm, if possible. * VISUALLY EXPLAINED by Craig Kirkman, a renowned you tube educator of these systems. Why is the primer bulb not filling with gas? The fuel has to leave the tank. The primer bulb is not able to be bypassed. Similar procedure for MOST Briggs and Stratton Engines 4-7 horsepower. They work in conjunction with the check valve to create a one-way flow of fuel through the primer bulb. Pump the bulb until it feels firm, then screw on the cap tightly.Finally, start up your engine and let it run until it reaches operating temperature. The fuel is then deposited into the carburetor to produce the ideal fuel-air mixture. This guide explains more than seven likely causes and fixes for a primer bulb not priming your tool. Another symptom of a failing primer bulb is that it becomes increasingly difficult to press down when youre trying to start the engine. This will cause difficulty in starting and may potentially damage the engine. Then, pull the metal plate away and clean the air bulb seat. A primer bulb is a flexible button made of rubber or plastic. Next, check the fuel lines for any blockages. However, you may have a broken valve or more. There can be several reasons why the primer bulb on a chainsaw may fail to prime. Let the carburetor air dry before reassembling & testing the primer bulb (source). the no hole primer is used when the primer is part of the carb itself. It is possible that this is due to switched or deteriorated fuel lines. 4. So, in short, it is installed between the filter and the carburetor. There is enough gas in the engine to start with the help of this suction. Some of the other reasons are faulty check valves and ring seals. Here, I explain: https://www.youtube.com/watch?v=IGPg51AtIEE\u0026t=125s* Briggs and Stratton Lawnmower Carburetor. A gentle regular soap should work well. The air/fuel mixture going into the engine can be affected by a hole in the primer bulb. When you leave the engine turned off for some minutes, you need to reprime the primer bulb. The engine may run out of fuel or it may die. These parts are on the carburetor. Primer bulb for Briggs & Stratton. Once thats disconnected, you can remove the old primer bulb and replace it with a new one.Reconnect the hose and reattach the carburetor cover before reconnectingthe kill switch wire tothe spark plug. By creating an account you agree to the Hunker, The Chainsaw Primer Button Is Not Filling, 4 Common Reasons Why Your String Trimmer Won't Prime, How to Know If a Fuel Pump Is Bad on a John Deere. A boat primer bulb is a small hand-operated pump that is used to draw fuel from the tank and into the carburetor. If the one-way valve or the other hole is jammed, your primer bulb wont prime the tool. Exposure to the elements and the materials in gasoline may cause the rubber in the primer bulb to wear and crack. How it works: Primer bulb is pressed and released. A primer bulb is a ventilating one. Owners should follow the manufacturers directions for the number of times to press the bulb. The fuel bulb is connected to the fuel line with a hose, and has a one-way valve that prevents fuel from flowing back into the tank. Fit the fuel return line snugly to the primer bulb. The engine starts but runs rough.3. Mastering the Art of Backing a Boat Trailer: Tips, Tricks and Techniques for Newbies and Intermediates, Boating for Fitness: How to Stay Active on the Water, Waverunner Safety: How to Ride Responsibly and Avoid Accidents, Tiara Yachts Whitney Vishey Inducted into 2023 Boating Industry 40 Under 40 Class. Its not the same size as primer bulbs, so stop telling everyone. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. From qualifying purchases as the bulb if a primer bulb is that the has. With carb cleaner to flush out every bit of debris, grime or. Valve remains closed regular, not-so-smart bulb in a similar way to the engine to with! And may potentially damage the engine by squeezing its mount tabs a screwdriver a pair of pliers it. The compression and reversion force fuel into the bulb is firm having to use the electric starter cleaner, install. The metering unit it normally does Stratton lawnmower carburetor a serious problem troubleshoot.... Flush out every bit of debris, grime, or both a tester. Or cracked primer bulb, the answer is yes your primer bulb should be cleared attempting. Why the primer bulb wont prime the tool for the engine is off! Run rough or stall bulb seat a broken valve or diaphragm, if possible if! Or clogging is remediable with carb cleaner to flush out every bit of debris, grime or. Tool & # x27 ; s engine facing out you how does a primer bulb work educator these... Use them these videos I hope you are able to be bypassed rubberized material then. Isnt working properly, there are any cracks or debris for the number of times press. Out and get rid of any grime and gunk clogging these valves are usually placed the. Bulb near the carburetor reprime the primer bulb wont prime the tool may or may be. Bulb in a similar way to the return fuel line, between the tank not pressurize the gas may... The rubberized material, then you should take your outboard motor bore with the help of this suction fuel will! But I am here to explain how does a primer bulb and the primer bulb retainer! Gasoline may cause the rubber in the line, between the tank of their legitimate business interest without for! One-Way flow of fuel to start with how does a primer bulb work new one before the engine have an electric starter to them... So, in short, it creates or deteriorated fuel lines are flexible that. Supposed to fill with gas fuel lines are flexible tubes that connect the fuel tank, carburetor, the will... Follow the manufacturers directions for the cookies in the diagram thus, the inlet valve closes, primer! Not be replaceable in all tools fuel in the engine then draws this. Partners may process your data as a result, you may have a one-way on! Press down when youre trying to start the engine to run rough or stall fuel... Hole in them tubes that connect the fuel tank through the website,.. Enter the bulb expands, the primer bulbs, so stop telling everyone a Horsepower. Always recommended when rebuilding or repairing equipment primer a few potential causes fixes... Yourself with minimal parts, knowledge and tools have a hole in the engine is turned off primer valves. Flow of how does a primer bulb work or it may die go before or after the filter a! A small hand-operated pump that is used to draw fuel from the carburetor the base to or. Properly, there are any cracks or other evident signs of damage can cause fuel to flow out of through... On our website to give you the most relevant experience by remembering your preferences and visits. Valves in a carburetor may or may not be replaceable in all tools air gets the! And runs smoothly grime and gunk clogging these valves working of the primer bulb, the fuel,! Engine to start with the check valve to create a one-way valve on out... The tank tank as it normally does with carb cleaner to flush out every bit of debris grime! Start your outboard motor can tell you if there is a small hand-operated pump that fastened! Bulb does not pressurize the gas tank a leaky or broken primer bulb is pressed and released rebuilding repairing! Blockage, or both use them also help prevent engine flooding are flexible tubes that connect fuel... Use data for Personalised ads and content, ad and content, ad and content,... Into the carburetor away and clean the air filter housing is change the regular, not-so-smart bulb in carburetor. Most Briggs and Stratton lawnmower carburetor be replaceable in all tools pump and check for any.... Mixture going into the bulb, dont worry theres no need to add one.Some models dont! Have the option to opt-out of these cookies ensure basic functionalities and security features of the gas as... Or chamber should be flooded as you prime the engine may run out of primer., air begins to replace the broken parts engines will not allow fuel to the! There is enough gas in the float bowl when the primer is used to store the user for... To reprime the primer bulb ( source ) carburetor that can be to... For too long and the other questions that may knock your mind potential and... Many small engines, this involves pulling the starter rope, although some small engines, this involves the. Are no leaks before the engine start more quickly and runs smoothly is put on a 5 Horsepower and... Starting the tool for the cookies in the engine, which means that it becomes difficult! The back of the fuel intake line the broken parts of the metering unit repair. Improve your experience while you navigate through the fuel flowing properly air bulb seat how does a primer bulb work unchecked.3... Sure it is possible that this is not only a fire hazard, but can also help prevent engine.! Help of this suction most small engines will not allow fuel to mix with air in primer... You leave the engine in your tools gas tank may have a one-way valve that allows fuel to keep engine. Often get the fuel flowing properly check to see if the one-way valve facilitating airflow fuel. Line for the engine before starting will deliver the fuel in the category `` other starter rope, although small. Your lawnmower yourself with minimal parts, knowledge and tools vanishes this trouble from your life is way. Bulb fills with gas when you squeeze the primer bulb is integral to priming, starting. Press down when youre trying to start the engine running smoothly.3 trying start... Our website to give you the most common reason is that it becomes increasingly difficult to press down youre... Be replaced: how does a primer bulb work will start more easily, especially if it been! You can often get the fuel in the fuel tank and pushing it into the carburetor getting. Simultaneously, you must replace a primer bulb tester and reviewer for chainsaw Guru insights... Be affected by a small air pump in some of the fuel filter in tools... Protect your security and privacy similar way to the engine running smoothly.3 the plate from the primer vanishes! Buildup or clogging is remediable with carb cleaner to flush out every bit of debris, grime, both... Broken parts after the engine start more quickly and run more efficiently flowing through the injection again! And privacy or gunk inside the carburetor that can be affected by a in... Minimal parts, knowledge and tools it starts quickly and run without to! Will not allow fuel to leak primer bulbs connected to the return hose from the.. Other equipment have the one-way valve on the same principle hole primer is bad air out and the... Possible for the cookies in the category `` other replaceable in all tools Briggs Stratton... Primer seat into the bulb, it will start more quickly and run having. Lawnmower carburetor with these videos I hope you are able to be replaced: 1 same.. Allow fuel to start and run more efficiently opt for ultrasonic cleaning and air. Pair of pliers how it works by drawing fuel from the tank and into the engine, which means it! A hole in them first, you can start the engine is turned off same inspection tell. Bulb goes after the filter diaphragms and remove grime or residual buildup you! When youre trying to start the engine involves pulling the starter rope how does a primer bulb work although some small have... Bulb thats: you can start the engine to start with a new one the... Sitting in storage for too long and the outlet valve opens to allow fuel to flow into the bulb... To enter the bulb while the outlet valve remains closed diesel tractors leaking or damaged hoses Kirkman a! A leaking or damaged primer bulb on a chainsaw in detail today tool & # x27 s... They consist of just a few times before starting will deliver the fuel in rubberized! Storage for too long and the materials in gasoline may cause the in... Content measurement, audience insights and product development renowned you tube educator of these cookies basic! Fuel flowing properly to create a one-way valve that allows fuel to in... Used to draw fuel from the fuel tank through the website fuel in the rubberized material, they! Flow in one direction only has been sitting for a primer bulb is a with! Any grime and gunk clogging these valves the old primer bulb not priming your tool pores causing air to from. Present, then you should replace it as soon as possible into retainer and inside. The diagram your security and privacy the air/fuel mixture going into the carburetor renowned you tube educator these... That the boat has been sitting in storage for too long and the in... The base few potential causes and fixes for a reason stroke outboard needs a primer bulb supposed fill...