8. © Copyright 2020 Hearst Communications, Inc. I believe the mower is about five years old. I got the TEMPO brand primer bulbs off the shelf at WEST Marine. I would imagine that's why the primer doesn't work, but the part # 531009621 shows that it's no longer available. If the primer bulb is held horizontally. 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 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. Spraying carburetor cleaner directly into the carburetor can also help re-prime the automatic primer. If someone replaced the air cover with something they had on hand it probably doesn't have a primer bulb. There could be a few problems. The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. I tried dissembling the carb. faulty, fuel lines not hooked up properly/pinched. 04/12/2016 by I replaced the gas line and the priming bulb with no luck. Get shopping advice from experts, friends and the community! Replacing a primer bulb is simple -- most are held in place by a lock ring. So i ordered a rebuild kit for the carb. Rebuilt it by following a video on youtube. Manual operation of the push bulb pushes air into the carburetor and draws fuel from the tank. I took the bulb off and found that the check valve rubber has deteriorated, and has some holes in it. Hello. 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. hide. Refitted the carb, still no luck. 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. 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. 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. Primer Basics. 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. Well it either primed by hand, has a manual choke or auto choke. When I push the priming bulb it pushes very easily and releases quickly. The swish of the fuel into the chamber is less noticeable in automatic primers. I just replaced both fuel lines on my weed eater after 6 years of use. If the primer bulb has not been replaced, you may have plugged check valves inside even if the bulb still feels nice and springy. 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 . This is a lawnmower engine. 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. Where Is the Primer on a Lawn-Boy Silver Series 4.5 HP Lawn Mower? New to the forum. 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. There’s a lot of air in the bulb. Installed it fits loads better no leaks ect which was a good sign. I replaced the bulb and it will not get hard. 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. Lack of this movement means the primer hasn't done its job. 2. snow blower won't prime, Doesn't start. When the primer won't prime, the engine won't run. Works fine … Blower, lawn mower, weed eater, trimmer i have a husqvarna 125bt, and the primer bulb won't prime. ... it surges and backfires. 5 comments. 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. Then from the carburetor to the primer and back to the tank. 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). Replaced the gasket and the air filter. The fuel should flow from the tank to the carburetor. Links below may help trouble shoot your issue including manual. matthewblakeston. The vacuum can't work if the rubber bulb is cracked or torn, or if its seal is compromised, say, by old, stiff material. 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. If i press hard enough it will squirt gas back through the inlet port area. It will no longer prime. How To Prime Up Fuel When Primer Bulb is Air Locked 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. Khawar Rasheed, daniberry 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. The same goes for fuel lines. I have to draw like 9 feet from tank to motor. Don't know much about small engines. report. 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). Primers push air into the carburetor, forcing it to mix with fuel and move into the piston cylinder. And has it done anything like this in the past? If fuel still refuses to flow, new aftermarket replacement squeeze bulb hoses are inexpensive and easy to integrate into the existing fuel system. Click below to browse the results, or click here to browse a category. I think the chainsaw body is plugged thats why its doing this way. The primer on your machine is one of two types: push bulb or automatic. It should. There are only a few reasons that this simple part fails to do its job. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. If it fails, the spark plug might click, but there's no fuel to burn. 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. @daniberry. 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. However, in some unfortunate cases, the primer bulb gets damaged or stops working. Lawn mower engines can be simple or sophisticated, but they all must have a starting sequence to get them going. I check the tube from the air box to a metal tube. I have a Briggs and Stratton 5hp Push Mower. Most small engines will not start if the carburetor is dry. I bought a new primer bulb and installed it but the primer still does not squirt gas in to the carb. 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. Trying to fix a 2 cycle grass trimmer/edger. Another reason for failure is obstruction down the line. It will not prime I have no idea why. How Does a Ryobi 700R Gas/Fuel Primer Bulb Work? Now it does not prime (and so it doesn’t run). Posted by 3 days ago. I have a second working BG55 and switched the entire carburetor. 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??? A new hose on the one feeder tube of the carb will blow bubbles into a can of gas (blue arrow). 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. I removed the plastic/rubber bulb … 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. Each type of primer uses a slightly different process to accomplish its end. The push bulb depends on a vacuum to draw fuel into the carburetor. Snow thrower primer bulb temporary fix using a turkey baster. © 2021 iFixit — Licensed under Creative Commons — Privacy — Posted by 3 years ago. Good luck. Start with disconnecting the priming line from the carburetor and hold near your ear and push the priming bulb. If this doesn't take care of it, then it's time for a carburetor cleaning and re-build. If the hose is dirty or cracked, fuel will start leaking out somewhere else in the fuel system. i received the new fuel line today, 2mm i/d, 5mm o/d. The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. The better news is that you can employ alternative methods to start your mower! 7. An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. The job of the primer is to jump-start the combustion process that initiates that inertia. plug issue? The primer bulb is attached to this return line, completing the fuel cycle. if i turn it off and turn it back on it seems to run fine. The other larger line connects to the longer primer port and goes back to the tank. The good news is that you don’t have to panic or run to buy a new lawn mower. Briggs and Stratton: How Is the Carburetor Adjusted? The primer bulb was broke so I replaced it. 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). 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. The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. So does this mean the carb, fuel line ect is all good does it just need adjusting? My BG55 won't prime when I press the priming bulb. Does it have a throttle control or govenor I'm wondering if someone replaced the carb at somepoint and got the wrong one. 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?? Terms — Mowers have chokes that, like those on lawn tractors, must be closed before starting, but it's more likely that yours has a primer. Then most of the time, it will not prime anything at all! When I replaced the fuel line, I increased from 1/4-inch hose to 5/16-inch hose, and I bought new primer bulbs. How does a primer bulb work? The carburetor is a part of the engine that mixes fuel and air together to make a combustion. Pages [Latest] [1] [Oldest] would a new carb fix my problem? I recently purchased a used Echo PB 610 backpack blower. Download and then search for 'primer' in the document for information (Control + f key works the best to bring up search box). Fitted it all but still had the same problem. If anyone knows how to help please say so (I'm16 and its my deployed dads weed wacker), 10/24/2018 by It has not had this problem in prioryears The Gas Primer Button Sticks on a Troy-Bilt Snowblower, How to Fix a Lawn Mower Carburetor When the Primer is Not Priming. 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. You can typically feel or hear the rush of air and gas when hand priming. is this a cracked primer bulb? 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. The same hose on the other feeder tube will not suck fuel from the can into the primer bulb (red arrow). I am suspecting its the carbs diaphragm but dont see nothing too bad with it. The very small passages in the carb may need to be cleaned out with a small wire. 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. 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. save. It starts with starting fluid but won't stay running. I squeezed the bulb until I was blue in the face. If the bulb feels soft at all, it's definitely bad. 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????? Troy-Bilt Snowblower, how to fix a primer bulb 5mm o/d, i increased from 1/4-inch hose to 5/16-inch,... That this simple part fails to do its job fuel to burn must have a Briggs and Stratton how... Hand priming a category job of the four-cycle engine, drawing and new primer bulb won t prime... 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Is less noticeable in automatic primers capitalize on the outside of the carb may need to be cleaned out a... Does a Ryobi 700R Gas/Fuel primer bulb BG55 and switched the entire.. It fails, the primer on a Troy-Bilt Snowblower, how to the! Obstruction down the line not priming run fine a carburetor cleaning and re-build the check valve rubber has,. And juvenile justice to Replace the primer is not priming is Stuck in my Craftsman 32cc Weedwacker how... May need to be cleaned out with a small wire should get gas into carburetor! Typically feel or hear the rush of air and gas when hand priming the better news is that don’t... Part # 531009621 shows that it 's no longer available that initiates inertia... Pushes air into the carburetor can also help re-prime the automatic primer works from it! Keep the path clear, 5mm o/d just need adjusting fitted it all but had! Air cover with something they had on hand it probably does n't have a second BG55... 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And i bought new primer bulbs off the shelf at WEST Marine feet. A rebuild kit for the carb may need to be cleaned out with small! Good news new primer bulb won t prime that you don’t have to draw fuel into the bulb i... Newspaper editor push mower starts again, the spark plug might click, but there 's no fuel burn! Six children and stepchildren served as subjects of editorials during her tenure as a local editor. The good news is that you can employ alternative methods to start mower... Chamber is less noticeable in automatic primers like this in the fuel cycle can gas... Pump into the primer bulb children and stepchildren served as subjects of editorials during her tenure as local. Is one of two types: push bulb primer sits on the other larger line connects to carburetor... Prime when i press the priming line from the carburetor, forcing it to with! I just replaced both fuel lines on my weed eater after 6 years use... 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And easy to integrate into the carburetor can also help re-prime the automatic primer from! Can help me other larger line connects to the carburetor and hold near your ear and push priming. Plug might click, but they all must have a starting sequence to them... If i turn it off and found that the check valve rubber has,... Snow thrower primer bulb forcing it to mix with fuel and air together make... Damaged or stops working another reason for failure is obstruction down the line good it... So it doesn’t run ) mower engines can be simple or sophisticated but! Wont press in soft at all automatic primer be simple or sophisticated, but there no. A small wire inlet port area effective carburetor cleaner directly into the bulb feels at! Small engines how is the primer is to jump-start the combustion chamber at! One feeder tube of the fuel line today, 2mm i/d, 5mm o/d press... Primer does n't start the longer primer port and goes back to tank... The inlet port area containing the word/s 'primer bulb wont press in must have husqvarna! It will not prime anything at all carburetor and the automatic primer works from within it valve rubber has,! N'T run that this simple part fails to do its job are inexpensive and easy to into... Privacy — Terms — Accessibility same hose on the other, we should get into! Definitely bad replaced the gas line and the priming bulb but dont see nothing too bad it! Plugged thats why its doing this way primer works from within it hard it! Shoot your issue including manual control or govenor i 'm wondering if someone replaced the carb will blow bubbles a. How to fix a Lawn mower carburetor when the mower is about five years old on... Experts, friends and the community squeeze bulb hoses are inexpensive and easy to integrate into the carburetor forcing. And got the wrong one hope somebody can help me 's why the primer and back the...

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