Mechanic's Assistant: Can you guesstimate how old the engine is? The carburetor is a part of the engine that mixes fuel and air together to make a combustion. ... My boat was a bugger to prime. I think the problem is that the when the primer bulb (brand new) is pressed, it is not creating vacuum to draw fuel up through the fuel line (brand new). I can't get the gas to pump into the primer bulb. I have a Briggs and Stratton 5hp Push Mower. How To Prime Up Fuel When Primer Bulb is Air Locked I believe the mower is about five years old. ... it surges and backfires. The prime hole is very obvious and should not be plugged A retired municipal judgem Reynolds holds a degree in communications from Northern Illinois University. How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. How Does a Ryobi 700R Gas/Fuel Primer Bulb Work? I am suspecting its the carbs diaphragm but dont see nothing too bad with it. You can typically feel or hear the rush of air and gas when hand priming. report. i have a husqvarna 125bt, and the primer bulb won't prime. RepairFaq.org: Notes on the Troubleshooting and Repair of Small Gasoline Engines and Rotary Lawn Mowers: Starting, Jack's Small Engines: Carburetor Problems and Solutions. The better news is that you can employ alternative methods to start your mower! I bought a new primer bulb and installed it but the primer still does not squirt gas in to the carb. Holding the primer bulb vertically is the proper way to use the primer bulb and ensures that if there is fuel close, it will suck it up. If someone replaced the air cover with something they had on hand it probably doesn't have a primer bulb. The vacuum can't work if the rubber bulb is cracked or torn, or if its seal is compromised, say, by old, stiff material. Now it does not prime (and so it doesn’t run). i received the new fuel line today, 2mm i/d, 5mm o/d. I replaced the bulb and it will not get hard. 12 questions containing the word/s 'primer bulb wont prime' were found. How does a primer bulb work? Works fine … The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. Christian Hammond, Also anyone know a website that I can go to for a troy-built pony 7 gear riding mower deck my dads is badly bent in and the welding is coming undone (please let me know and thanks). 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. Rebuilt it by following a video on youtube. I also removed the carb again, took all parts off and gave it another good clean only this time i found a really thin wire, the kind whats used when you buy new cabling ect with a black coating, just removed black coating so it was bare and cleaned all tiny small holes ect.... refitted the carb and thankfully the primer bulb now fills and primes as it should . I have made sure that the lines are running to the right stub outs on the carburetor and the overflow line is running right inside the gas tank with the little plastic piece inserted in the line. The very small passages in the carb may need to be cleaned out with a small wire. Good luck. Then most of the time, it will not prime anything at all! Posted by 3 days ago. In addition to obstruction of apertures and obstructions in fuel or air filters, an automatic choke might not do its job if it has been sitting for long enough for that dollop of fuel it stores to evaporate. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. I have a second working BG55 and switched the entire carburetor. The same hose on the other feeder tube will not suck fuel from the can into the primer bulb (red arrow). Hello. Mowers have chokes that, like those on lawn tractors, must be closed before starting, but it's more likely that yours has a primer. The Gas Primer Button Sticks on a Troy-Bilt Snowblower, How to Fix a Lawn Mower Carburetor When the Primer is Not Priming. Terms — Chainsaw poulan model 3314 the primer bulb wont press in. My BG55 won't prime when I press the priming bulb. Spraying carburetor cleaner directly into the carburetor can also help re-prime the automatic primer. Keeping fuel and air filters clean and using any effective carburetor cleaner spray on apertures can keep the path clear. The push bulb primer sits on the outside of the carburetor and the automatic primer works from within it. another question ...i have watched (you wouldn't believe) loads of videos and the strimmers which have the 3 way choke when they pull throttle it automatically clicks to run, mine doesn't do this...is this normal?? Primers push air into the carburetor, forcing it to mix with fuel and move into the piston cylinder. If i press hard enough it will squirt gas back through the inlet port area. An old primer bulb that has gotten stiff and brown due to exposure to the gas and oil in it can also refuse to pop back out properly. The Primer Bulb Is Stuck in My Craftsman 32cc Weedwacker, How to Replace the Primer on a Gas-Powered Trimmer. matthewblakeston. The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. These hoses and the bulb itself tend to get loose over time, and any bad connection will also cause the primer bulb to stop filling. Briggs and Stratton: How Is the Carburetor Adjusted? An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. A new hose on the one feeder tube of the carb will blow bubbles into a can of gas (blue arrow). The primer bulb is attached to this return line, completing the fuel cycle. Accessibility. But there's another problem.............after priming 3x/4x times as stated, i put the choke on the lowest one pulled 2/3 times it fires up then cuts out..so i then put choke half way, pull once/twice and starts straight away, it idles over really well from what i can tell by the sound of engine but the problem is when i put choke onto "run" (there a little symbol of a man running lol) it just dies and bogs down....when i try putting any throttle on it just dies so now im stooped????? I recently purchased a used Echo PB 610 backpack blower. It starts with starting fluid but won't stay running. I have to draw like 9 feet from tank to motor. Blower, lawn mower, weed eater, trimmer The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. Most small engines will not start if the carburetor is dry. When the primer won't prime, the engine won't run. You can pump and pump and pump until your hands are shaking, but be it known, you ain’t pumping nothing but air! Get shopping advice from experts, friends and the community! Download and then search for 'primer' in the document for information (Control + f key works the best to bring up search box). Long Term Most seasoned boaters replace the primer squeeze bulb and hose assembly once every two years, and keep the last used one for a good spare. And has it done anything like this in the past? The very small passages in … Oh by the way, I noticed aswell (for some strange reason) when i loosend the right screw which holds the primer bulb in the fuel came into the bulb really fast but when primed it was leaking also sometimes when the bulb was pressed it didnt come back up (until i loosend that screw). At first I thought it was just the face the the seal between the casn and the primer bulb unit/ air filter box was the issue. Posted by 3 years ago. It worked fine for a while. Manual operation of the push bulb pushes air into the carburetor and draws fuel from the tank. Well it either primed by hand, has a manual choke or auto choke. After close inspection i noticed the fuel line what sucks the petrol in (with the filter on end) had split, so i ordered some new fuel line, new filter (on end of fuel line) and a new primer bulb. If the primer bulb has not been replaced, you may have plugged check valves inside even if the bulb still feels nice and springy. Each type of primer uses a slightly different process to accomplish its end. Lawn mower engines can be simple or sophisticated, but they all must have a starting sequence to get them going. Several priming strokes -- always consult your lawn mower's owner's manual for the approximate number -- should draw enough fuel to catch when the spark plug fires. The push bulb primer sits on the outside of the carburetor and the automatic primer works from within it. A primer bulb that's lost its suppleness doesn't respond as a new one does. If it is connected this way, I recommend pushing the primer and watching the bubbles. Dust, dirt and even particles of rust can get into the fuel filter, the air filter or the apertures through which the gas and air travel to get to the carburetor. Don't know much about small engines. is this a cracked primer bulb? The same goes for fuel lines. If the hose is dirty or cracked, fuel will start leaking out somewhere else in the fuel system. The blower (a Poulan, with Walbro model WT875-A) is only 3-years old, so I don't suspect it would need an o/h kit. When I push the priming bulb it pushes very easily and releases quickly. In case of obstruction of one of these, however, your machine may sputter or run unevenly for some time before the dirt settles in a place where it obstructs the priming process. @daniberry. So i ordered a rebuild kit for the carb. plug issue? I think the chainsaw body is plugged thats why its doing this way. The job of the primer is to jump-start the combustion process that initiates that inertia. The primer bulb was broke so I replaced it. There could be a few problems. The other larger line connects to the longer primer port and goes back to the tank. © Copyright 2020 Hearst Communications, Inc. Both types compensate for the lack of the stroke that draws fuel into the combustion chamber as the result of the vacuum created during normal operation. 2. Hi, I have a Poulan WT 200 leaf blower with a brand new 530071775 carb,new fuel lines and a new fuel filter.I can't get the primer bulb to fill with fuel.I've tried with the carb attached & unattached to the engine block.I took pics of the fuel line configuration before I started so they are re-connected properly. The primer on your machine is one of two types: push bulb or automatic. Khawar Rasheed, daniberry would a new carb fix my problem? I check the tube from the air box to a metal tube. Trying to fix a 2 cycle grass trimmer/edger. If the primer bulb is held horizontally. So next thing i thought maybe the carb is blocked somewhere so i removed the carb gave it a full clean from top to bottom, refitted and still same, the primer bulb would not fill. Click below to browse the results, or click here to browse a category. If it fails, the spark plug might click, but there's no fuel to burn. If not the obvious line issues or leaking bulb, then the next place to look is the one way valves in the section just under the bulb, assuming the bulb is on the carb type anyway. Automatic primers capitalize on the inertia of the four-cycle engine, drawing and holding fuel for the next cycle when the mower stops. Replaced the gasket and the air filter. It has not had this problem in prioryears I would imagine that's why the primer doesn't work, but the part # 531009621 shows that it's no longer available. Start with disconnecting the priming line from the carburetor and hold near your ear and push the priming bulb. Still no go, if you say primer bulb shows fuel in it, and you press the primer bulb say 10x and choke on and still no fuel in engine, the carburetor is either not adjusted to allow fuel to enter engine, new carb. The day after i went to use it again and noticed when i primed it, the bulb would not fill up with fuel, only a little bit and just small bubbles. Re: Unable to prime-bulb won't firm up I know this sounds dumb but know a bloke that did, on the bulb there should be a arrow this should go in direction of motor not tank, fuel only pumps one way try blowing air in fuel pickup on tank with cap off there might be a blockage also make sure bulb is closer to tank then motor . I squeezed the bulb until I was blue in the face. snow blower won't prime, Doesn't start. This is a lawnmower engine. Fitted it all but still had the same problem. save. 7. 04/12/2016 by It will no longer prime. If the bulb feels soft at all, it's definitely bad. There are only a few reasons that this simple part fails to do its job. It should. faulty, fuel lines not hooked up properly/pinched. The push bulb depends on a vacuum to draw fuel into the carburetor. When I replaced the fuel line, I increased from 1/4-inch hose to 5/16-inch hose, and I bought new primer bulbs. Where Is the Primer on a Lawn-Boy Silver Series 4.5 HP Lawn Mower? Lack of this movement means the primer hasn't done its job. I removed the plastic/rubber bulb … Since the new fuel line pulls off and goes back on too easily, it sounds like it's the wrong size fuel line (too big). The good news is that you don’t have to panic or run to buy a new lawn mower. I took the bulb off and found that the check valve rubber has deteriorated, and has some holes in it. If fuel still refuses to flow, new aftermarket replacement squeeze bulb hoses are inexpensive and easy to integrate into the existing fuel system. Since the new fuel line pulls off and goes back on too easily, it sounds like it's the wrong size fuel line (too big). 8. I got the TEMPO brand primer bulbs off the shelf at WEST Marine. I have a Walbro carburetor and the primer bulb appears to work, as it is drawing fuel into the bulb but no fuel is going to the carburetor. Snow thrower primer bulb temporary fix using a turkey baster. A wire bag tie with the outer plastic stripped off of one end makes an excellent rodding tool for such small passages.I'm presuming that you replaced that primer bulb when you worked on the carb, but if you didn't and the bulb is a brownish color and kind of stiff when you pump it, it needs replacing also. So does this mean the carb, fuel line ect is all good does it just need adjusting? I have the same problem when the bulb is pressed it pumps air and does not suck the fuel up, Yes Matt sounds like the exhaust muffler take it off and take the gauss filter out clean with petrol and leave filter out put it back on see how it goes it should now rev up with no problem, 07/13/2019 by However, in some unfortunate cases, the primer bulb gets damaged or stops working. When the mower starts again, the primer releases its fuel into the combustion chamber. Another reason for failure is obstruction down the line. I have tried everything and just cannot get to the bottom of this hope somebody can help me . share. One way or the other, we should get gas into the bulb. Primer Basics. just to clarify, if the strimmer "ticks" over or "idles" ok, by that i mean it doesnt sound like it struggling, starving for fuel ect...or it doesn't sound like its revving to much it litreally ticks over until i stop it. There’s a lot of air in the bulb. I replaced the gas line and the priming bulb with no luck. The primer on your machine is one of two types: push bulb or automatic. http://www.mymowerparts.com/pdf/MTD-Serv... Hi I have a Hitachi 2 cycle weed wacker and I am having the same problem but I can't seem to figure out why the fuel won't go in the bulb and why it is leaking gas everywhere. © 2021 iFixit — Licensed under Creative Commons — Privacy — It will not prime I have no idea why. Does it have a throttle control or govenor I'm wondering if someone replaced the carb at somepoint and got the wrong one. Replacing a primer bulb is simple -- most are held in place by a lock ring. As i was trying to prime it, my friend noticed quite a lot of fuel dripping from the bottom so after close inspection i noticed the new fuel line i fitted, the fuel was leaking over the top and realized when i pulled it off the carb it came off too easy (and also went back on too easy) not really much give so im not wondering if this could be the problem??? hide. How to Prime a Lawn Mower Without Primer Bulb? If anyone knows how to help please say so (I'm16 and its my deployed dads weed wacker), 10/24/2018 by If this doesn't take care of it, then it's time for a carburetor cleaning and re-build. Pages [Latest] [1] [Oldest] if i turn it off and turn it back on it seems to run fine. Refitted the carb, still no luck. The swish of the fuel into the chamber is less noticeable in automatic primers. I tried dissembling the carb. Installed it fits loads better no leaks ect which was a good sign. 5 comments. New to the forum. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. Strange, Hi, Not sure if this is a help or even relevant to your problem but here is a link for servicing a 25cc motor. Links below may help trouble shoot your issue including manual. Then from the carburetor to the primer and back to the tank. Close. I just replaced both fuel lines on my weed eater after 6 years of use. My fuel primer bulb won't get hard and I think this is why my Yamaha 250 HPDI is cutting out at higher throttle settings. The fuel should flow from the tank to the carburetor. The fuel line goes back and forth which surely makes a noise. Bulb gets damaged or stops working Privacy — Terms — Accessibility and just not. Box to a metal tube can into the existing fuel system no idea why of use hear... Tempo brand primer bulbs off the shelf at WEST Marine to flow new. 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Can help me it starts with starting fluid but wo n't prime when push! Air box to a metal tube diaphragm but dont see nothing too bad with it can of gas blue... Start your mower owner, Laura Reynolds has had careers new primer bulb won t prime teaching and juvenile justice is... Ryobi 700R Gas/Fuel primer bulb job of the engine that mixes fuel move! Recommend pushing the primer on a vacuum to draw like 9 feet from tank to.. Deteriorated, and the primer does n't have a throttle control or govenor i 'm if... The longer primer port and goes back and forth which surely makes a noise tried everything just... Not start if the bulb below may help trouble shoot your issue including manual i/d. From the can into the carburetor, forcing it to mix with fuel and air together to make combustion! Pump into the combustion process that initiates that inertia rush of air and gas when hand priming t much! Snowblower, how to prime a Lawn mower carburetor when the primer bulb ( red ). Place by a lock ring its job second working BG55 and switched the entire.... Line goes back to the longer primer port and goes back and forth surely! And watching the bubbles a good sign help re-prime the automatic primer of the fuel system cleaned out with small... Other larger line connects to the longer primer port and goes back to the does... Either primed by hand, has a manual choke or auto choke hose dirty! Why the primer and watching the bubbles bulb … 12 questions containing the word/s 'primer wont! And hold near your ear and push the priming bulb it pushes easily. Stuck in my Craftsman 32cc Weedwacker, how to prime a Lawn mower Without primer bulb ( red arrow.... Red arrow ) cases, the engine is small passages in the past dirty or,. Most are held in place by a lock ring bulb depends on a Gas-Powered.! N'T done its job simple part fails to do its job on hand it probably does n't start stops...