Reconnect the fuel hose to the bottom of the primer bulb. 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. Make sure you have a small hole in the primer bulb dead center. Sear's craftsman self propelled walk behind, briggs and stratton engine, mower model,917378070. Problems with the carburetor or fuel line, for example, can cause gas to leak. If it runs as long as you keep pushing the primer bulb would confirm a carburetor issue. SUBSCRIBERS NEEDED: Typical mistakes made the first time you replace a primer bulb fuel gas push button for common lawnmowers. 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. 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. My lawn mower will only run if I am pushing the primer bulb- what is wrong with it? Priming it too many times by pushing the primer bulb can also cause flooding. Is there anything else we could assist you with? I'm not sure of the age. Hold the mount and bulb in place while tightening down the mounting screws. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into the carburetor properly. When your engine starts and stalls, it is often due to standard maintenance problems. 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. Ball and spring will fall out. Most small engines will not start if the carburetor is dry. If not, it will not stay running. amzn_assoc_title = "Smart Sprinkler Controllers"; Get shopping advice from experts, friends and the community! The engine probably starts because gas enters the cylinder when you press the primer bulb. 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. NOTE: Do not stretch, bend or compress primer spring. I just put a new primer bulb on it, but when I push it no gas is injected into the carburetor. Short of taking the mower in for service, is there an easy way to start the mower? 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. Press the primer bulb back into the mount and secure it. Gasket and diaphragm was installed eaxctly the way it was found. The method is super reliable and does not take up too much of your time. It was purchased used. 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. Noticing gas on your mower or your garage floor doesn't always mean the primer bulb is the culprit. Remount the carburetor. Reassemble the primer bulb and the lawn mower. Please feel free to Comment! The method is super reliable and does not take up too much of your time. My Mower Leaks Gas From the Primer Bulb The diaphragm on a Briggs & Stratton 550 lawn mower engine is part of the carburetor. Remove the old primer bulb. amzn_assoc_linkid = "c170a6b72f8ca4b3df92487a43a3bbd6"; Quickly put the air cleaner back in its original position and replace the cover. So, it won't start. 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. start and run great just for a few seconds, then dies like the switch has been turned off. I usually use a dab of sealer applied with a toothpick to seal up the filter housing, but multiple gaskets work well also. See Full Answer. 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”. Find the air cleaner and remove its cover. That is why they come with a primer bulb that acts as a replacement and ensures that the lawn mower is functioning smoothly. Rebuild or replace the carburetor if the engine dies soon after start-up. 1. As a regular lawn mower user, you know that the primer bulb is an inseparable part to start a lawn mower. Prevent stalling problems before they start with a tune-up kit. Removed old primer bulb 2. Read on: The method is super reliable and does not take up too much of your time. Now, your lawn mower is ready to use without the primer bulb! Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Bad Primer Bulb All of these conditions are consistent with a gummed / contaminated carburetor and or bad gas. © Copyright 2020 Hearst Communications, Inc. 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. This is the primer bulb style carburetor. Time for repair shop unless you are handy with lawn mowers. Consult your mower's parts manual for diagrams that show you the primer bulb's placement. New clip/ring very difficult to insert 5. You will need a long wing span or helper to quickly press the bulb before engine stalls. Ineedtech 5-Packs Primer Bulb 570682A for 951-10639A 751-10639 MTD Craftsman Troy-Bilt Ryobi Bolens Snow Blower Thrower, Fit Tecumseh AV520 HMSK100 … So now I'm thinking its the fuel pump, bad floats or clogged jets. Except the only twist is that when we were on the bay...the primer bulb would return to shape. Read more. It was purchased and sat covered in her dry basement (no fuel or oil added) for about three years. The primer bulb is flexible. Replaced new primer bulb 4. Install the new primer bulb. Remove primer seat using a crochet hook or other type of hook. The engine is 10T802-0457-b2 . Since primer bulbs and tubes are both made of flexible plastic or rubber, they will eventually harden, crack and deteriorate over time. Here is one of the easiest and the most reliable alternatives. Did this article solve your query? Primer bulbs are usually positioned on the lawn mower one of two ways. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. A primer bulb that's lost its suppleness doesn't respond as a new one does. Listen to engine and keep it running with primer for 15 to 20 seconds if it starts to stall press the primer … Several tries with screwdriver which could have easily punctured primer bulb 6. Common Symptoms of Bad Gas: The engine won’t start. It is present on the carburetor, and all you have to do is to press it like a button to start your lawn mower. Step 1 Pull the cover off the air cleaner mounted on the side of the mower engine. amzn_assoc_ad_mode = "manual"; When it's not working, however, the bulb may refuse to pop back out after you depress it. Install the new primer bulb and reconnect any fuel lines as necessary. I don't think the primer bulb itself is what's causing it to die, but may be a … 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. Finally clicked into place 7. Engine Stalling, Surging or Running Rough. 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. However, in some unfortunate cases, the primer bulb gets damaged or stops working. The symptoms were the same before it was disassembled. This carburetor has a fuel feed bolt in the base of the bowl, dirt in the bolt feed hole is a common issue. Does the Primer Bulb on a Homelite Chain Saw Have a Hose on It? If the mower starts and does not vibrate abnormally, the blade and blade adapter is OK. Use the best method to remove it accordingly. – Problem Solved, However, in some unfortunate cases, the primer bulb gets damaged or stops working. Make sure the fuel lines are firmly attached to prevent gas leaks that could result in a fire on the lawnmower. amzn_assoc_ad_type = "smart"; When reinstalling the primer back into the BR600 backpack blower, reassemble the parts in reverse order first. Repair help > Gas Walk-Behind Mower repair > Gas Walk-Behind Mower symptoms. The better news is that you can employ alternative methods to start your mower! Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works. A lawn mower can make your lawn look fresh and fascinating. 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. amzn_assoc_search_bar = "false"; Proceed to remove the air cleaner itself. Try pumping the gas manually with the bulb as soon as you start the mower. The carb is very common , this one is part# 798758 . Avoid it by being swift in your action. Removal of the primer bulb can be made quick and easy using our Primer Bulb … Primer bulbs are usually positioned on the lawn mower one of two ways. 2nd trip on LSC, the new (?) Retainer clip/ring impossible to remove from engine without destroying it 3. It comes with a replacement air filter/primer bulb housing gasket. one stayed flat. 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_marketplace = "amazon"; ... One of the first symptoms commonly associated with a bad or failing carburetor is a reduced engine performance. 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. Reconnect both fuel hoses to 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. ... so you'll need to rebuild or replace the carburetor if your lawn mower won't stay running. It may also make a sound as if it's simply sucking air and not give any resistance when pushed. With a primer bulb, starting the lawn mower is especially easy because it sends gas into the carburetor bowl only when you need it. Select tubing that's the same diameter as the tubing that's already on the lawn mower. Was running good before it was stored for winter, son-in -law left outside under deck. It is the easiest way to use a lawn mower, and many users swear by it. Be very careful to memorize its location as you do so. I bought a house last April. Based on what you have checked I would suspect the primer bulb is bad. Prime it again and it will start and do the same thing. Take starter fluid and spray some of it in the hole that you see in the housing. Without this gasket your primer bulb won't work. The same goes for fuel lines. The same goes for fuel lines. They're either directly on the carburetor, or placed at a distance from the carburetor and connected to it with rubber tubing. But it is possible only when your lawn mower works properly. 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. 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. The housing should be clearly exposed by now. 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