When your engine starts and stalls, it is often due to standard maintenance problems. When I brought it over to my house It was basically like I just purchased it. one stayed flat. Removal of the primer bulb can be made quick and easy using our Primer Bulb … start and run great just for a few seconds, then dies like the switch has been turned off. Remove the old primer bulb. Primer bulbs are usually positioned on the lawn mower one of two ways. Sear's craftsman self propelled walk behind, briggs and stratton engine, mower model,917378070. Other times, the bowl is empty. Most small engines will not start if the carburetor is dry. So, it won't start. 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. SUBSCRIBERS NEEDED: Typical mistakes made the first time you replace a primer bulb fuel gas push button for common lawnmowers. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. 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. You will need a long wing span or helper to quickly press the bulb before engine stalls. Replaced the bulb and went over to LSC...same problem. Hold the mount and bulb in place while tightening down the mounting screws. When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. Listen to engine and keep it running with primer for 15 to 20 seconds if it starts to stall press the primer … Pull off the old lines, hold them against the coil of new line and cut the new line to the same length. And most of the lawn mower uses a primer bulb because they do not have enough space to accommodate a carburetor. Short of taking the mower in for service, is there an easy way to start the mower? Figured the check valve was bad. Common Symptoms of Bad Gas: The engine won’t start. When reinstalling the primer back into the BR600 backpack blower, reassemble the parts in reverse order first. Several tries with screwdriver which could have easily punctured primer bulb 6. Try pumping the gas manually with the bulb as soon as you start the mower. 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. The carb is very common , this one is part# 798758 . Ineedtech 5-Packs Primer Bulb 570682A for 951-10639A 751-10639 MTD Craftsman Troy-Bilt Ryobi Bolens Snow Blower Thrower, Fit Tecumseh AV520 HMSK100 … The reason why you should be quick is that starter fluid tends to evaporate on exposure to air. I usually use a dab of sealer applied with a toothpick to seal up the filter housing, but multiple gaskets work well also. ... stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil. Remove primer seat using a crochet hook or other type of hook. amzn_assoc_search_bar = "false"; Without this gasket your primer bulb won't work. A lawn mower can make your lawn look fresh and fascinating. Read more. Based on what you have checked I would suspect the primer bulb is bad. Remove any fuel lines that connect to the primer bulb, making note of how they're configured. Wouldn't start, replaced primer bulb and air filter,spark plug,fuel line. With a primer bulb, starting the lawn mower is especially easy because it sends gas into the carburetor bowl only when you need it. Proceed to remove the air cleaner itself. They're either directly on the carburetor, or placed at a distance from the carburetor and connected to it with rubber tubing. When it's not working, however, the bulb may refuse to pop back out after you depress it. 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. 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. Primer bulbs are usually positioned on the lawn mower one of two ways. The engine probably starts because gas enters the cylinder when you press the primer bulb. Be very careful to memorize its location as you do so. Ball and spring will fall out. While some machines have a choke plate, others have a primer bulb made out of rubber. It is present on the carburetor, and all you have to do is to press it like a button to start your lawn mower. Is there anything else we could assist you with? Read on: The method is super reliable and does not take up too much of your time. amzn_assoc_ad_mode = "manual"; I just put a new primer bulb on it, but when I push it no gas is injected into the carburetor. Take starter fluid and spray some of it in the hole that you see in the housing. It works by squirting fuel into your engine. Priming it too many times by pushing the primer bulb can also cause flooding. Except the only twist is that when we were on the bay...the primer bulb would return to shape. Use the best method to remove it accordingly. But it is possible only when your lawn mower works properly. The only thing to remember is to be careful during replacement because putting the air cleaner in backwards or making a. Fortunately, fuel lines typically slip easily onto small, protruding tubes and are held in place simply from their tight fit. 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”. 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. amzn_assoc_ad_type = "smart"; It is the easiest way to use a lawn mower, and many users swear by it. This is a after market replacement carburetor for the Briggs 4-7hp engines. 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. Once you've gained access to the bulb's housing, remove the screws that hold it in place. 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. If the mower starts and does not vibrate abnormally, the blade and blade adapter is OK. 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. Also, why does my primer bulb not work? 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. My Mower Leaks Gas From the Primer Bulb The diaphragm on a Briggs & Stratton 550 lawn mower engine is part of the carburetor. They're either directly on the carburetor, or placed at a distance from the carburetor and connected to it with rubber tubing. Here is one of the easiest and the most reliable alternatives. Primer works well & engine starts The air cleaner is present near the engine, and the cover may be clipped on or screwed in. Rebuild or replace the carburetor if the engine dies soon after start-up. Finally clicked into place 7. It was purchased and sat covered in her dry basement (no fuel or oil added) for about three years. 2nd trip on LSC, the new (?) Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works. 1. There's a slight resistance when you push it, and you can feel that it's pulling fuel from the gas tank. Prime it again and it will start and do the same thing. The engine is 10T802-0457-b2 . See Full Answer. Removed old primer bulb 2. Amie Taylor has been a writer since 2000. – Problem Solved, However, in some unfortunate cases, the primer bulb gets damaged or stops working. The better news is that you can employ alternative methods to start your mower! The symptoms were the same before it was disassembled. The housing should be clearly exposed by now. Did this article solve your query? © Copyright 2020 Hearst Communications, Inc. A primer bulb that's lost its suppleness doesn't respond as a new one does. The primer bulb is flexible. Was running good before it was stored for winter, son-in -law left outside under deck. It was purchased used. Engine Stalling, Surging or Running Rough. Now, your lawn mower is ready to use without the primer bulb! The primer bulb isn’t working. Usually this is accomplished by following the same process as removing the bulb in the opposite order. Now, your lawn mower is ready to use without the primer bulb! As a regular lawn mower user, you know that the primer bulb is an inseparable part to start a lawn 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. amzn_assoc_linkid = "c170a6b72f8ca4b3df92487a43a3bbd6"; 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. However, in some unfortunate cases, the primer bulb gets damaged or stops working. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into the carburetor properly. I have a 1988 Toro lawn mower with a Suzuki 5 hp 2-stroke engine. I don't think the primer bulb itself is what's causing it to die, but may be a … Consult your mower's parts manual for diagrams that show you the primer bulb's placement. New clip/ring very difficult to insert 5. Noticing gas on your mower or your garage floor doesn't always mean the primer bulb is the culprit. NOTE: Do not stretch, bend or compress primer spring. Repair help > Gas Walk-Behind Mower repair > Gas Walk-Behind Mower symptoms. Quickly put the air cleaner back in its original position and replace the cover. amzn_assoc_asins = "B01D1NMLJU,B01D15HOIQ,B00IEFXDES,B00VIX4R2U"; How to Start 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. Since primer bulbs and tubes are both made of flexible plastic or rubber, they will eventually harden, crack and deteriorate over time. amzn_assoc_marketplace = "amazon"; We would love to hear from you. I was given a brand new craftsman lawn mower. If it runs as long as you keep pushing the primer bulb would confirm a carburetor issue. amzn_assoc_tracking_id = "smartsprinklercontroller-20"; Reconnect both fuel hoses to the carburetor. Install the new primer bulb. This is the primer bulb style carburetor. Does the Primer Bulb on a Homelite Chain Saw Have a Hose on It? The method is super reliable and does not take up too much of your time. 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. amzn_assoc_region = "US"; Select tubing that's the same diameter as the tubing that's already on the lawn mower. The good news is that you don’t have to panic or run to buy a new lawn mower. Find the air cleaner and remove its cover. Remount the carburetor. Clean the carburetor and primer bulb components. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Make sure the fuel lines are firmly attached to prevent gas leaks that could result in a fire on the lawnmower. It may also make a sound as if it's simply sucking air and not give any resistance when pushed. How to Replace the Primer on a Gas-Powered Trimmer, Tips on Inserting Fuel Lines in Chainsaw Gas Tanks. Replaced new primer bulb 4. Machines usually need a carburetor to function, but small machines such as lawn mowers do not have the space to accommodate one. amzn_assoc_title = "Smart Sprinkler Controllers"; 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 … Please feel free to Comment! Prevent stalling problems before they start with a tune-up kit. When this gas is used up, the bad carburetor will not allow any gas to flow though it to sustain engine operation. Reassemble the primer bulb and the lawn mower. Avoid it by being swift in your action. Install the new primer bulb and reconnect any fuel lines as necessary. My lawn mower will only run if I am pushing the primer bulb- what is wrong with it? The method is super reliable and does not take up too much of your time. Press the primer bulb back into the mount and secure it. I bought a house last April. 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 carburetor has a fuel feed bolt in the base of the bowl, dirt in the bolt feed hole is a common issue. All of these conditions are consistent with a gummed / contaminated carburetor and or bad gas. It comes with a replacement air filter/primer bulb housing gasket. The same goes for fuel lines. 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. I'm not sure of the age. Step 1 Pull the cover off the air cleaner mounted on the side of the mower engine. 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. How to Prime a Lawn Mower Without Primer Bulb? Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Bad Primer Bulb ... so you'll need to rebuild or replace the carburetor if your lawn mower won't stay running. If not, it will not stay running. 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. Get shopping advice from experts, friends and the community! So now I'm thinking its the fuel pump, bad floats or clogged jets. 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. Retainer clip/ring impossible to remove from engine without destroying it 3. Make sure you have a small hole in the primer bulb dead center. The same goes for fuel lines. Time for repair shop unless you are handy with lawn mowers. Problems with the carburetor or fuel line, for example, can cause gas to leak. It could be a worn rubber gasket inside the carburetor or a bad float needle. That is why they come with a primer bulb that acts as a replacement and ensures that the lawn mower is functioning smoothly. 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 primer bulb has (or is supposed to have) a small vent hole. Reconnect the fuel hose to the bottom of the primer bulb. 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 … Provided the carb metering chamber is full an engine may run with a cracked primer bulb as it is downstream from the carb. Pry retainer out and remove bulb from primer seat groove. 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