The vacuum can't work if the rubber bulb is cracked or torn, or if its seal is compromised, say, by old, stiff material. 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 primer bulb is attached to this return line, completing the fuel cycle. @daniberry. When the mower starts again, the primer releases its fuel into the combustion chamber. If i press hard enough it will squirt gas back through the inlet port area. 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. Don't know much about small engines. The good news is that you donât have to panic or run to buy a new lawn mower. I can't get the gas to pump into the primer bulb. The prime hole is very obvious and should not be plugged I have tried everything and just cannot get to the bottom of this hope somebody can help me . 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). Where Is the Primer on a Lawn-Boy Silver Series 4.5 HP Lawn Mower? Get shopping advice from experts, friends and the community! 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. 7. 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. And has it done anything like this in the past? Rebuilt it by following a video on youtube. It should. Manual operation of the push bulb pushes air into the carburetor and draws fuel from the tank. 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. Does it have a throttle control or govenor I'm wondering if someone replaced the carb at somepoint and got the wrong one. 04/12/2016 by The carburetor is a part of the engine that mixes fuel and air together to make a combustion. 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. 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. 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. You can typically feel or hear the rush of air and gas when hand priming. I have to draw like 9 feet from tank to motor. If it fails, the spark plug might click, but there's no fuel to burn. It will not prime I have no idea why. © Copyright 2020 Hearst Communications, Inc. Terms — The job of the primer is to jump-start the combustion process that initiates that inertia. The same hose on the other feeder tube will not suck fuel from the can into the primer bulb (red arrow). matthewblakeston. It starts with starting fluid but won't stay running. Replaced the gasket and the air filter. 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 believe the mower is about five years old. 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 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. So does this mean the carb, fuel line ect is all good does it just need adjusting? If this doesn't take care of it, then it's time for a carburetor cleaning and re-build. Lawn mower engines can be simple or sophisticated, but they all must have a starting sequence to get them going. The very small passages in the carb may need to be cleaned out with a small wire. Refitted the carb, still no luck. © 2021 iFixit — Licensed under Creative Commons — Privacy — The very small passages in ⦠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 snow blower won't prime, Doesn't start. I have a second working BG55 and switched the entire carburetor. The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. I got the TEMPO brand primer bulbs off the shelf at WEST Marine. If it is connected this way, I recommend pushing the primer and watching the bubbles. How to fix a primer bulb that wonât prime and fill with gas, small carburetor, small carb. plug issue? report. 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. Blower, lawn mower, weed eater, trimmer 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 Gas Primer Button Sticks on a Troy-Bilt Snowblower, How to Fix a Lawn Mower Carburetor When the Primer is Not Priming. share. is this a cracked primer bulb? 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. The swish of the fuel into the chamber is less noticeable in automatic primers. When I push the priming bulb it pushes very easily and releases quickly. The better news is that you can employ alternative methods to start your mower! I just replaced both fuel lines on my weed eater after 6 years of use. 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?? Trying to fix a 2 cycle grass trimmer/edger. Her six children and stepchildren served as subjects of editorials during her tenure as a local newspaper editor. Then from the carburetor to the primer and back to the tank. If the hose is dirty or cracked, fuel will start leaking out somewhere else in the fuel system. 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). An avid perennial gardener and old house owner, Laura Reynolds has had careers in teaching and juvenile justice. 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. Snow thrower primer bulb temporary fix using a turkey baster. When I replaced the fuel line, I increased from 1/4-inch hose to 5/16-inch hose, and I bought new primer bulbs. The primer bulb was broke so I replaced it. It will no longer prime. The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. How Does a Ryobi 700R Gas/Fuel Primer Bulb Work? save. 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. My BG55 won't prime when I press the priming bulb. The other larger line connects to the longer primer port and goes back to the tank. Posted by 3 years ago. Replacing a primer bulb is simple -- most are held in place by a lock ring. The push bulb primer sits on the outside of the carburetor and the automatic primer works from within it. 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. Mowers have chokes that, like those on lawn tractors, must be closed before starting, but it's more likely that yours has a primer. I recently purchased a used Echo PB 610 backpack blower. I bought a new primer bulb and installed it but the primer still does not squirt gas in to the carb. How To Prime Up Fuel When Primer Bulb is Air Locked 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. The fuel should flow from the tank to the carburetor. If the bulb feels soft at all, it's definitely bad. Then most of the time, it will not prime anything at all! Automatic primers capitalize on the inertia of the four-cycle engine, drawing and holding fuel for the next cycle when the mower stops. There are only a few reasons that this simple part fails to do its job. Start with disconnecting the priming line from the carburetor and hold near your ear and push the priming bulb. 2. faulty, fuel lines not hooked up properly/pinched. I have a Briggs and Stratton 5hp Push Mower. If anyone knows how to help please say so (I'm16 and its my deployed dads weed wacker), 10/24/2018 by Lack of this movement means the primer hasn't done its job. 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. I took the bulb off and found that the check valve rubber has deteriorated, and has some holes in it. Works fine ⦠Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. 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. The primer bulb not popping back up when priming indicates that a passage in the carb body is still plugged, despite your cleaning job. How does a primer bulb work? I check the tube from the air box to a metal tube. Mechanic's Assistant: Can you guesstimate how old the engine is? Posted by 3 days ago. Another reason for failure is obstruction down the line. 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 . Chainsaw poulan model 3314 the primer bulb wont press in. I squeezed the bulb until I was blue in the face. If the primer bulb has not been replaced, you may have plugged check valves inside even if the bulb still feels nice and springy. 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. 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??? 5 comments. 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. would a new carb fix my problem? Fitted it all but still had the same problem. i received the new fuel line today, 2mm i/d, 5mm o/d. Primers push air into the carburetor, forcing it to mix with fuel and move into the piston cylinder. I removed the plastic/rubber bulb ⦠You can pump and pump and pump until your hands are shaking, but be it known, you ainât pumping nothing but air! Hello. One way or the other, we should get gas into the bulb. 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). 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. When i push the priming bulb with no luck and push the priming bulb 4.5 Lawn! 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Tenure as a local newspaper editor experts, friends and the automatic primer results, click...