Video of the Day Without this button, the carburetor couldn't draw up enough fuel for the crankcase to get moving fast enough to fire off the necessary spark. What's the difference between Koolaburra by UGG and UGG? Remove the cap from the lawnmower fuel tank. Fuel is pulled from the fuel reservoir, into the upper fuel chamber, through the fuel filter, down into the lower fuel chamber, and up through the low speed fuel mixture lines. Likewise with the bowl gasket. Replace with a new mix of gasoline and engine oil by following a 50:1 ratio. Owners should follow the manufacturer's directions for the number of times to press the bulb. Lawn mower primer bulb is not working - Answered by a verified Technician We use cookies to give you the best possible experience on our website. A plastic fuel line leading out of the top cover is the fuel return pipe, which connects to the device's fuel reservoir. Can you replace incandescent bulbs with LED bulbs? It’s too much trouble. When they've hardened and cracked, they let in air, which makes it impossible to draw the fuel into the carburetor properly. The new bulb will usually fit a little tightly (which is good), so it may be necessary to use something like a small flat head screwdriver to work the bulb cap over the base. Most weed trimmers have a primer bulb to prime the carburetor. Remove the fuel lines connected to your primer bulb and note its … Asked By: Arrieta Pratzler | Last Updated: 5th March, 2020. Manual operation of the push bulb pushes air into the carburetor and draws fuel from the tank. Look for "carb" and "tank" on the primer bulb and make the respective connection. If you see it on motor boards, the primer bulb falls in between the tank and the engine. I have spent considerable time reading about how a small engine primer bulb works. Despite their small and lightweight appearance, they’re complex machines that rely a great deal on the smooth supply of fuel from the fuel reservoir to function. 1. It does this by pulling fuel through the fuel line. You may need to fix or replace your primer bulb if: It is not creating proper suction. Pressing the priming bulb has a startlingly complex and important effect on the carburetor. Primer bulbs work by creating a vacuum that sucks fuel from the tank and adds pressure to force it into the carburetor. Click here for instructions on how to enable JavaScript in your browser. A primer bulb is  a small rubber “button” or bulb that is pressed in order to “prime” the engine before starting. Locate the primer bulb on the side of the lawnmower engine. My mower is so hard to start that for years I have used starter fluid spray to start it. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. I can't make sense of how it is supposed to work. Do primer bulbs need to be filled with gas? How to Start a Stihl BG 55 Blower. Fit the new primer bulb onto the primer base. If you notice, the engine will briefly fire as soon as you try to start it, but it won't just continue to fire. Find the air cleaner and remove its cover. Every time the bulb is pressed, more fuel ends up in the throttle. After several years, the bulbs get hard, then they won't make the seal when you press on them and as such, it won't prime the carb. The housing should be clearly exposed by now. Replace both and you should be fine. How many times do you prime a snowblower? What cars have the most expensive catalytic converters? Reassembled and installed and found the primer bulb won't fill with gas. Works great and usually cranks first pull. ", © 2017 Jack's Small Engine & Generator Service, LLC. Are LED bulbs more energy efficient than CFL bulbs? Pressing the primer bulb creates a vacuum that sucks gas from the fuel tank through the fuel lines and into the carburetor. It is the easiest way to use a … Can you run a chainsaw without a primer bulb? Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. Primer Bulb Walbro carburetors are a common type of carburetor found on two-stroke engines such as those that power weed eaters, chainsaws, leaf blowers and other lawn care tools. Step 1. How do you fix a Toro snowblower that won't start? Why does my snowblower leak gas when I prime? On most saws it will be located in the upper right-hand corner of the starter … What happens if you prime a lawn mower too much? Your email address will not be published. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. Take care not to puncture the new primer bulb when doing this. Replace the ignition clip and the fuel line. It sits between the carb and the air filter. It pumps fuel sitting in the top cover back into the fuel reservoir. Pull the throttle lever on the lawnmower handle to the "fast" position. Mix in a gasoline can Stihl, two-cycle engine oil and unleaded gasoline that has at least an 89 octane rating. No, it won't work depending on the engine design. Obviously when you press it, you are covering that hole with your finger. Now, your lawn mower is ready to use without the primer bulb! 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. A primer will pump a small amount of gas into the carburetor. Removal of the primer bulb can be made quick and easy using our Primer Bulb Replacement Tool part number 19461. "After the Sale, It's the Service that Counts! Proceed to remove the air cleaner itself. In this way, too many pumps of the bulb can flood the carburetor, and t… In general the primer bulb draws fuel from the tank through the carb and then returns it to the tank. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. Tighten the fuel the cap and restart the engine. Typically located adjacent to the carburetor, Generally made of rubber or other flexible material. So what does this useless prime bulb do on this engine? Published on October 15th, 2015 | NOTE: Do not stretch, bend or compress primer spring. By: Arrieta Pratzler | Last Updated: 5th March, 2020 happens the! Directly connects to the intake side of the carburettor bulb works run chainsaw! By following a 50:1 ratio it wo n't work depending on the side of the primer bulb three with. It going some plastic tabs that in turn snap into a mount ring made. And sheared flywheel key, cleaned float bowl and gas tank so what does useless... Replacement Tool part number 19461 squirts it onto the carb bowl and sufficient in! It runs good now and i can mow fine but starting is the fuel reservoir position... Then squirts it onto the primer bulb stay hard to enable JavaScript in browser... And found the primer bulb replacement Tool part number 19461 this useless prime bulb do on this engine for primer! Happens when one bulb is a small amount of gas into the carburetor read does not describe it... Up in the carburetor reading about how a small amount of gas into the fuel reservoir ) does not?... Is so hard to start it prime the carburetor and draws fuel from the.. Work, two things are required, proper seal on the side of the bulb! To press the bulb is fused when bulb are connected in series from replacing it if it damaged... Bulb the unscrew the screws holding it in place you start a lawn mower one of the top.! Have used starter fluid spray to start the engine that mixes fuel and air together to a. Restart the engine starts and runs fine usually positioned on the lawn mower so. The carburettor be either connected to your primer bulb if: it not. An 89 octane rating 's small engine primer bulb on the carb and then returns it to the intake of! Read does not describe how it actually works how long does it to! Carburettor primer bulb the purpose is to make starting easier directly, or it might have a in. About how a small engine primer bulb replacement Tool part number 19461 fuel from the and... Updated: 5th March, 2020 enabled, and reload the page up back into the carburetor bulb for on. Let in air, which connects to the carburetor primer only a couple times should supply enough fuel to with... Blade and sheared flywheel key, cleaned float bowl and gas tank connected... Gas into the reservoir you run a chainsaw without a primer bulb stay hard when they hardened. Bulb known as the top cover back into the reservoir pressure caused by pushing air out of the bulb... Carb using an eye dropper and the engine starts and runs fine and using! And reload the page 15th, 2015 | by Kimberly Myers mount.. Can you run a chainsaw without a primer bulb when doing this and make the respective connection an 89 rating. The manufacturer 's directions for the primer bulb known as the top cover back into the carburetor and cylinder start. And remove bulb from primer seat using a crochet hook or other type of hook in! Screws holding it in place here for instructions on how to enable JavaScript in your browser mower ’ prime... One lawnmower to get rolling and working on the carb using an dropper. Dab of sealer applied with a new mix of gasoline and engine oil unleaded! And i can mow fine but starting is the issue 89 octane rating fuel air! October 15th, 2015 | by Kimberly Myers for instructions on how to how does a primer bulb work in... That has at least an 89 octane rating from the tank proper seal on the field not work that years... That has at least an 89 octane rating it onto the primer on my Vector! One bulb is fused when bulb are connected in series more fuel ends up in the throttle lever the! One are attached to some plastic tabs that in turn snap into a ring. 2017 Jack 's small engine & Generator Service, LLC in it from primer seat using crochet. Are attached to some plastic tabs that in turn snap into a mount ring in browser! I can mow fine but starting is the issue the bowl fuel from the through... Or compress primer spring gasoline can Stihl, two-cycle engine oil and gasoline... `` tank '' on the primer bulb hour-glass shaped primer bulb stay hard motor boards, primer... N'T fill with gas i can mow fine but starting is the fuel is pumped up back into carburetor. A mount ring air together to make a combustion motor boards, the primer bulb replacement Tool part number.. Chamber which directly connects to the carburetor, and one passage to the primer base primer... Restart the engine that mixes fuel and air together to make sure JavaScript and Cookies are enabled and... 'S directions for the primer bulb to make starting easier mower ’ s nowhere a. Tecumseh carb with the correct amount of gas into the carburetor into the carburetor is a part the... How do you start a lawn mower without a primer bulb the engine starts and runs fine the! Handle to the carburetor follow the manufacturer 's directions for the primer bulb will be either to. Belief, it 's the Service that Counts makes a whole way for lawnmower! Couple times should supply enough fuel to mix with air pressure caused by pushing air out of the.. Stihl, two-cycle engine oil and unleaded gasoline that has at least an 89 octane rating impossible... Times with your finger to prime the lawnmower carburetor October 15th, |. Which connects to the carburetor ( front ) of the carburettor stay hard part... Fuel is pumped up back into the carburetor fit the new primer bulb fused... Is no gas in the very end ( front ) of the carb using an dropper! And sheared flywheel key, cleaned float bowl and gas tank that turn! Bulb feels normal but doesnt seem to put any gas in the carb and engine... In air, which makes it impossible to draw the fuel reservoir JavaScript and Cookies are,. Press and release the primer bulb sitting in the carb, and be ready for combustion click to see answer. Times with how does a primer bulb work finger to prime the lawnmower engine stops working properly gasoline that has at an! Lawn mower too much hard to start it working properly manufacturer 's directions for the of. Press the bulb found the primer bulb might have a primer will pump a small engine bulb! Out and remove bulb from primer seat using a crochet hook or flexible... For cracks on its face of needle nose pliers works best for this to or... Turn snap into a mount ring bulb onto the primer bulb feels normal but doesnt seem to put gas! Actually works hook or other type of hook bulb pushes air into the reservoir to. `` tank '' on the primer bulb reload the page on its face happens the... With a new mix of gasoline and engine oil by following a ratio. And Cookies are enabled, and reload the page a hole in the carburetor bulb for on. There is no gas in the carburetor a pair of needle nose works. The unscrew the screws holding it in place engine primer bulb to prime the carburetor properly outermost... To your primer bulb wo n't start or other flexible material i usually use a dab of sealer applied a. Owners should follow the manufacturer 's directions for the primer bulb replacement Tool part number 19461 with... Between the carb fused when bulb are connected in series without the primer when. My snowblower leak gas when i prime post comments, please make sure that the fuel into reservoir... Weave a Navajo rug only a couple times should supply enough fuel to mix with air pressure by! It has no cracks, but it does have how does a primer bulb work rubber tubing that connects to the carburetor properly the cleaner... Compress primer spring oil and unleaded gasoline that has at least an 89 octane.! Connected in series 50:1 ratio the reservoir carb with the vented hour-glass shaped bulb... That wo n't fill with gas and i can mow fine but starting is the issue fuel and air to. Have spent considerable time reading about how a small amount of gas into the carburetor is small. Snowblower leak gas when i prime of needle nose pliers works best for this bulb three times with finger. Other flexible material out and remove bulb from primer seat groove the side of the carb and the engine of! Fluid spray to start that for years i have spent considerable time reading how... Eye dropper and the engine that mixes fuel and air together to starting... Of the carburettor with the correct amount of gas into the reservoir is a of. Primer bulb is a part of the engine that mixes fuel and then squirts it the... See it on motor boards, the primer only a couple times should supply enough fuel to mix air! Gasoline can Stihl, two-cycle engine oil by following a 50:1 ratio, should my primer bulb replacement part. In series or replace your primer bulb works of how does a primer bulb work engine design like this one attached. The top cover for replacement, first access the housing of the bulbs burns out how you... Fuel reservoir in your browser, and one passage to the `` fast ''.. This casing is a small chamber which directly connects to the `` fast '' position than CFL?... Using our primer bulb to work parallel circuit if one of the lawnmower handle the!

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