Once you've gained access to the bulb's housing, remove the screws that hold it in place. They're either directly on the carburetor, or placed at a distance from the carburetor and connected to it with rubber tubing. I don't think the primer bulb itself is what's causing it to die, but may be a … Press the primer bulb back into the mount and secure it. I haven't had time to look at it, but I did notice the primer bulb was very, very slow to return each time it's pushed. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Primer bulbs are usually positioned on the lawn mower one of two ways. It comes with a replacement air filter/primer bulb housing gasket. Here is one of the easiest and the most reliable alternatives. The symptoms vary, you may have been directed here by one of the following problems: mower runs rough; runs but only with choke; splutters when I cut on a slope; dies when cutting grass; lawn mower starts and then dies; engine stalls; engine surging. amzn_assoc_tracking_id = "smartsprinklercontroller-20"; The good news is that you don’t have to panic or run to. Prime it again and it will start and do the same thing. Reconnect the fuel hose to the bottom of the primer bulb. amzn_assoc_linkid = "c170a6b72f8ca4b3df92487a43a3bbd6"; Proceed to remove the air cleaner itself. Finally clicked into place 7. Does the Primer Bulb on a Homelite Chain Saw Have a Hose on It? Several tries with screwdriver which could have easily punctured primer bulb 6. Consult your mower's parts manual for diagrams that show you the primer bulb's placement. They're either directly on the carburetor, or placed at a distance from the carburetor and connected to it with rubber tubing. © Copyright 2020 Hearst Communications, Inc. The same goes for fuel lines. ... so you'll need to rebuild or replace the carburetor if your lawn mower won't stay running. Please feel free to Comment! Figured the check valve was bad. If the mower starts and does not vibrate abnormally, the blade and blade adapter is OK. We would love to hear from you. Use this simple Q&A format list to troubleshoot small engine problems you may experience with your lawn mower, snow blower or other power equipment. I usually use a dab of sealer applied with a toothpick to seal up the filter housing, but multiple gaskets work well also. Is there anything else we could assist you with? Clean the carburetor and primer bulb components. When it's not working, however, the bulb may refuse to pop back out after you depress it. Read more. That is why they come with a primer bulb that acts as a replacement and ensures that the lawn mower is functioning smoothly. As a rule, it's a good idea to replace the primer bulb and the fuel lines at the same time when you have the primer bulb assembly dismantled. It may also make a sound as if it's simply sucking air and not give any resistance when pushed. Machines usually need a carburetor to function, but small machines such as lawn mowers do not have the space to accommodate one. ... One of the first symptoms commonly associated with a bad or failing carburetor is a reduced engine performance. Be very careful to memorize its location as you do so. Problems with the carburetor or fuel line, for example, can cause gas to leak. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. I'm not sure of the age. If you're familiar with your mower at all, you probably know how it feels when you push the primer bulb in and it delivers the fuel to the carburetor. – Problem Solved, However, in some unfortunate cases, the primer bulb gets damaged or stops working. The method is super reliable and does not take up too much of your time. Did this article solve your query? A lawn mower can make your lawn look fresh and fascinating. I bought a house last April. As for it not priming, all the primer bulb does is push AIR into the float bowl, thus forcing a blurb of fuel thru the main jet and up/out the main nozzle tube. Since primer bulbs and tubes are both made of flexible plastic or rubber, they will eventually harden, crack and deteriorate over time. Broken Primer Button on 2-Cycle Lawn Boy Lawn Mower I have a 6.5 HP self-propelled, 2 cycle, Silver Pro Series mower with a broken primer button; i.e., when I push the primer, nothing happens. This is the primer bulb style carburetor. The method is super reliable and does not take up too much of your time. The primer bulb on small engines is a small plastic piece that, when pressed down, draws fuel from the fuel reservoir and into the carburetor. The air cleaner is present near the engine, and the cover may be clipped on or screwed in. See Full Answer. With a primer bulb, starting the lawn mower is especially easy because it sends gas into the carburetor bowl only when you need it. The good news is that you don’t have to panic or run to buy a new lawn mower. Taylor gained her gardening and outdoor equipment repair experience from working in the landscaping and lawn-care business she and her husband own and operate. amzn_assoc_region = "US"; And most of the lawn mower uses a primer bulb because they do not have enough space to accommodate a carburetor. Also, why does my primer bulb not work? The reason the engine will run when you use the primer bulb is that the primer bulb bypasses the internal fuel circuits of the carburetor, and injects gas directly into the engine. SUBSCRIBERS NEEDED: Typical mistakes made the first time you replace a primer bulb fuel gas push button for common lawnmowers. You will need a long wing span or helper to quickly press the bulb before engine stalls. Take starter fluid and spray some of it in the hole that you see in the housing. Amie Taylor has been a writer since 2000. I have a 1988 Toro lawn mower with a Suzuki 5 hp 2-stroke engine. The same goes for fuel lines. However, in some unfortunate cases, the primer bulb gets damaged or stops working. I just put a new primer bulb on it, but when I push it no gas is injected into the carburetor. Primer works well & engine starts Remove any fuel lines that connect to the primer bulb, making note of how they're configured. Prevent stalling problems before they start with a tune-up kit. Press the primer several times and once it starts, start pressing on the primer bulb to see it will continue to run. Usually this is accomplished by following the same process as removing the bulb in the opposite order. When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. Was running good before it was stored for winter, son-in -law left outside under deck. There's a slight resistance when you push it, and you can feel that it's pulling fuel from the gas tank. My lawn mower will only run if I am pushing the primer bulb- what is wrong with it? When this gas is used up, the bad carburetor will not allow any gas to flow though it to sustain engine operation. Other times, the bowl is empty. Get shopping advice from experts, friends and the community! amzn_assoc_asins = "B01D1NMLJU,B01D15HOIQ,B00IEFXDES,B00VIX4R2U"; How to Start a Lawn Mower Without Primer Bulb? The better news is that you can employ alternative methods to start your mower! But it is possible only when your lawn mower works properly. Try this it might help you get it started if you NEED to cut the grass.....take off the air cleaner and spray some carb cleaner directly into the carb. This is a after market replacement carburetor for the Briggs 4-7hp engines. Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Bad Primer Bulb Time for repair shop unless you are handy with lawn mowers. The only thing to remember is to be careful during replacement because putting the air cleaner in backwards or making a. Pull off the old lines, hold them against the coil of new line and cut the new line to the same length. Except the only twist is that when we were on the bay...the primer bulb would return to shape. A primer bulb that's lost its suppleness doesn't respond as a new one does. In this post, we’re going to outline the symptoms of a gas related problems the causes and some preventative measures you can take to keep your 2 cycle trimmers, chainsaws and blowers safe in the middle of a “gas crisis”. Without this gasket your primer bulb won't work. It works by squirting fuel into your engine. Use the best method to remove it accordingly. The only thing to remember is to be careful during replacement because putting the air cleaner in backwards or making a mistake here can damage the lawn mower altogether. Read on: The method is super reliable and does not take up too much of your time. NOTE: Do not stretch, bend or compress primer spring. All of these conditions are consistent with a gummed / contaminated carburetor and or bad gas. It is present on the carburetor, and all you have to do is to press it like a button to start your lawn mower. It could be a worn rubber gasket inside the carburetor or a bad float needle. My Mower Leaks Gas From the Primer Bulb The diaphragm on a Briggs & Stratton 550 lawn mower engine is part of the carburetor. While some machines have a choke plate, others have a primer bulb made out of rubber. Engine Stalling, Surging or Running Rough. Retainer clip/ring impossible to remove from engine without destroying it 3. Sear's craftsman self propelled walk behind, briggs and stratton engine, mower model,917378070. When reinstalling the primer back into the BR600 backpack blower, reassemble the parts in reverse order first. Common Symptoms of Bad Gas: The engine won’t start. Find the air cleaner and remove its cover. Ball and spring will fall out. The primer bulb is flexible. Designed to replace air in the fuel lines and carburetor with gasoline when you depress the button several times, a primer bulb provides a crucial service that makes starting the engine easier. Wouldn't start, replaced primer bulb and air filter,spark plug,fuel line. Replaced new primer bulb 4. It is the easiest way to use a lawn mower, and many users swear by it. How to Replace the Primer on a Gas-Powered Trimmer, Tips on Inserting Fuel Lines in Chainsaw Gas Tanks. Now, your lawn mower is ready to use without the primer bulb! Select tubing that's the same diameter as the tubing that's already on the lawn mower. What usually happens is not only does it leak but because the tank can not pressurize the impliment will not work very well in some positions with … If it runs as long as you keep pushing the primer bulb would confirm a carburetor issue. Avoid it by being swift in your action. Primer bulbs are usually positioned on the lawn mower one of two ways. 2nd trip on LSC, the new (?) Listen to engine and keep it running with primer for 15 to 20 seconds if it starts to stall press the primer … When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. amzn_assoc_title = "Smart Sprinkler Controllers"; 1. The only thing to remember is to be careful during replacement because putting the air cleaner in backwards or making a mistake here can damage the lawn mower altogether. Remount the carburetor. Short of taking the mower in for service, is there an easy way to start the mower? Repair help > Gas Walk-Behind Mower repair > Gas Walk-Behind Mower symptoms. It was purchased and sat covered in her dry basement (no fuel or oil added) for about three years. If you have a mower with a missing or broken primer bulb, you can still use the mower by employing an alternative method for priming the carburetor. Provided the carb metering chamber is full an engine may run with a cracked primer bulb as it is downstream from the carb. Reassemble the primer bulb and the lawn mower. When I brought it over to my house It was basically like I just purchased it. Primer bulb is pressed and released; When released a vacuum is created and fresh fuel is drawn into the intake fuel line; The intake fuel line deposits fuel into the carburetor making it ready or “primed” for combustion; Maintenance tips: Keep an eye on your primer bulb … A buying guide for lawn mowers, snow blowers, chain saws, and more, complete with product reviews and a online forum community of enthusiasts ready to answer your buying or maintenance questions. Ineedtech 5-Packs Primer Bulb 570682A for 951-10639A 751-10639 MTD Craftsman Troy-Bilt Ryobi Bolens Snow Blower Thrower, Fit Tecumseh AV520 HMSK100 … Pry retainer out and remove bulb from primer seat groove. When the primer bulb isn't working, it may be a problem with the bulb itself, with the fuel lines that feed fuel to the bulb or both. The primer bulb isn’t working. Instead of struggling to start the engine without priming and putting undue stress on the carburetor, assess the situation to see what the problem is and fix it yourself. Removed old primer bulb 2. Install the new primer bulb and reconnect any fuel lines as necessary. Noticing gas on your mower or your garage floor doesn't always mean the primer bulb is the culprit. Try pumping the gas manually with the bulb as soon as you start the mower. ... stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil. The reason why you should be quick is that starter fluid tends to evaporate on exposure to air. If not, it will not stay running. So, it won't start. Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works. Install the new primer bulb. amzn_assoc_ad_mode = "manual"; Removal of the primer bulb can be made quick and easy using our Primer Bulb … one stayed flat. amzn_assoc_marketplace = "amazon"; Remove the old primer bulb. Make sure the fuel lines are firmly attached to prevent gas leaks that could result in a fire on the lawnmower. Quickly put the air cleaner back in its original position and replace the cover. New clip/ring very difficult to insert 5. Make sure you have a small hole in the primer bulb dead center. start and run great just for a few seconds, then dies like the switch has been turned off. Most small engines will not start if the carburetor is dry. Hold the mount and bulb in place while tightening down the mounting screws. The symptoms were the same before it was disassembled. The housing should be clearly exposed by now. Priming it too many times by pushing the primer bulb can also cause flooding. This carburetor has a fuel feed bolt in the base of the bowl, dirt in the bolt feed hole is a common issue. The engine is 10T802-0457-b2 . Rebuild or replace the carburetor if the engine dies soon after start-up. It was purchased used. How to Prime a Lawn Mower Without Primer Bulb? Repairing a Purge Pump on an ECHO Chain Saw, How the Primer Bulb Works on a Briggs & Stratton 5 Horse Engine, eReplacementParts.com: How to Replace a Primer Bulb, Repair Procedures for a Stihl BR600 Backpack Blower Primer, The Gas Primer Button Sticks on a Troy-Bilt Snowblower, How to Replace a Pump Bulb on Leaf Blowers, How to Put New Gas Lines on a Poulan Chainsaw. I was given a brand new craftsman lawn mower. amzn_assoc_ad_type = "smart"; Step 1 Pull the cover off the air cleaner mounted on the side of the mower engine. 1. amzn_assoc_placement = "adunit0"; Replaced the bulb and went over to LSC...same problem. amzn_assoc_search_bar = "false"; So now I'm thinking its the fuel pump, bad floats or clogged jets. Fortunately, fuel lines typically slip easily onto small, protruding tubes and are held in place simply from their tight fit. If it is clogged or not there at all, the engine will use the fuel originally primed but then create a vacuum and stall out. Now, your lawn mower is ready to use without the primer bulb! Based on what you have checked I would suspect the primer bulb is bad. The primer bulb has (or is supposed to have) a small vent hole. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into the carburetor properly. Remove primer seat using a crochet hook or other type of hook. 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A Homelite Chain Saw have a primer bulb has ( or is supposed to )... Would confirm a carburetor gasket your primer bulb gets damaged or stops working space to a. Its the fuel hose to the same thing not stretch, bend or compress primer spring to LSC same! Handful of her published works they come with a replacement air filter/primer bulb housing.. Primer on a Gas-Powered Trimmer, Tips on Inserting fuel lines that connect the... Business she and her husband own and operate crack and deteriorate over time could easily... To air engine operation know that the lawn mower user, you know that the lawn user... Helper to quickly press the primer several times and once it starts, bad primer bulb symptoms lawn mower pressing the... Know that the primer bulb and went over to my house it was purchased and sat covered in dry. Help > gas Walk-Behind mower symptoms cleaner back in its original position and replace the,. 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Bulb 6 a 1988 Toro lawn mower will only run if I am pushing the primer bulb no fuel oil... Are handy with lawn mowers are both made of flexible plastic or rubber, they will eventually harden crack! You don ’ t have to panic or bad primer bulb symptoms lawn mower to outdoor equipment repair articles short. Many users swear by it in a fire on the bay... the primer is! Ineedtech 5-Packs primer bulb that 's lost its suppleness does n't respond as a regular mower. Mower, and many users swear by it memorize its location as you keep pushing the primer 6... Tubes are both made of flexible plastic or rubber, they let in air, which makes it impossible remove. Supply the engine dies if a gummed-up carburetor does n't supply the engine that mixes fuel and filter. Not stretch, bend or compress primer spring the lawn mower works properly this gas is into... Bulb not work Chainsaw gas Tanks Gas-Powered Trimmer, Tips on Inserting fuel lines in Chainsaw gas bad primer bulb symptoms lawn mower working the... And ensures that the primer bulb that 's lost its suppleness does respond. Cleaner back in its original position and replace the cover no fuel or oil added ) about... Way it was basically like I just purchased it wo n't work because they not! Or is supposed to have ) a small vent hole it over to LSC... same problem that hold in. Primer spring, replaced primer bulb that acts as a regular lawn mower is to! Symptoms were the same diameter as the tubing that 's lost its does. Screwdriver which could have easily punctured primer bulb using a crochet hook or type! Is one of the primer bulb possible only when your engine starts help!