Allen by Manage My Life. The older (up to late 1980's/ early 1990's) equipment had actual Primer bulbs exactly as AJP described. someone installed a boat primer bulb on mine and i learned to never touch it,as i tried to use it to fill my filter one time,then realized it just blew the gas past the needle and seat and wasted the gas..and not good for a 4 stroke if it gets in there with the oil very much.. 05-15-2013, 11:18 PM #7: racin161. This allows enough gas to reach the carburetor and cylinder for ignition, so you can start a cold engine. The engine dies if a gummed-up carburetor doesn't supply the engine with needed fuel to keep it running. Does anyone know how to help me? Sometimes we forget to do this in the midst of working. Another common source of air leaks is the connection point of the carburetor and fuel hoses. It can float in the gas and settle against the fuel filter, blocking all in-flowing gas. If not, the bulb may be damaged. There is a small check valve inside the primer bulb, which maintains fuel in the carburetor after priming, the engine will start with the primer but won't maintain full throttle if this check valve is bad. Show Less. Report This by Manage My Life. It remains only at 720p resolution. Fuel lines, no. The primer bulb pulls fuel from the carb into the bulb and dumps back to the tank; Check the fuel supply and return lines to ensure that they are not cracked, bent or kinked; Next, Primer bulb - Is there always fuel in your primer bulb, or does the primer bulb drain dry when the saw is not in use ? The other larger line connects to the longer primer port and goes back to the tank. Only checked the lines to see if there was a clog. The primer bulb can’t suck it up without removing it. What's with that odd design?). I checked the bulb and it looks ok. My fuel/water separator needed to be replaced so I changed that out and I still can't get the bulb to prime. You are using an out of date browser. The primer bulb attaches to the fuel hose system. I only use fresh, non-ethanol fuel mix. ENGINE DOES NOT START, PURGE/PRIMER BULB WILL NOT FILL WITH GAS. Craftsman weed eater 358.791010 primer bulb won't pull gas. Once they are full of incompressible liquid, squeeze bulbs are very positive in sending fuel to the motor until its fuel pumps can get a firm lock on the liquid fuel. Thank you for your help. The fuel should flow from the tank to the carburetor. Much lighter than my 025 Stihl. It is hard to throw away a trimmer that I know will run but for something in the fuel system I can't discover. Engines with carburetors tend to have their fuel system vented to the atmosphere. With the arrow pointing to the side where you pulled the hose off. Links below may help trouble shoot your issue including manual. There is a small check valve inside the primer bulb, which maintains fuel in the carburetor after priming, the engine will start with the primer but won't maintain full throttle if this check valve is bad. (My Stihl has this really weird vent based on 2 threaded screws in a plastic tube. Please keep us in mind if you have any other problems with anything around the house. 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. Craftsman weed eater 358.791010 primer bulb won't pull gas. Have taken it apart. I hear a little squeak. Any Hints are gratefully appreciated. Your string trimmer (also known as a weed wacker or weed eater) draws fuel from the tank to the carburetor via the primer. Thank you for using Manage my life. Inspect the carburetor mounting for loose hardware. Echo Primer Bulbs: Jacks is your Place! Blower, lawn mower, weed eater, trimmer The entire fuel system must maintain an airtight seal for everything to work properly. B. BassHunter0123 Seaman. Leave most major carburetor repairs to a professional. Is there supposed to be some kind of check valve in the body of the primer base? How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. How to Troubleshoot a String Trimmer That Won't Prime Image ... fully press and then release the primer for another round of 10 to see if that's the solution. Most likely, the gas is getting blocked at the source. I have a stihl fs45 trimmer. Pump the bulb until it is firm to the touch. There are bubbles in the tank when I push the primer bulb and, when the tank is full, some gas comes out of the tank at the cap. Yes, the little white thing hanging out in space is a tank vent - supposed to let air in, and not out. Problem with IP... runaway... full throttle all of the time. usually running a partial choke means the carb is gummed up, or so I've found. Classifieds - Engine/Transmission/Transfer Case, BJ42 | FJ43 | BJ44 | FJ45 | FJ45LV | HJ47, North American Clubhouses - Central Region, CA.AB- Rocky Mountain Land Cruiser Association, CO/WY- Horsetooth 4 Wheelers Cruiser Club, TX- Lone Star Land Cruisers - Austin Chapter, TX- The White Trash of the Elwood Chapter, CA.BC- Okanagan-Similkameen Land Cruisers, NV- Battle Born Cruisers of Northern Nevada. The first hose, the suction hose, draws fuel up from the tank. Contrary to popular belief, it does not squirt a little gas into the engine to get it going. When the primer won’t hold fuel in the bulb something is either blocking the flow of fuel or air. Comment . Any help on how to get the airlock out or what I should try will be appreciated. Often, primer bulbs can crack or puncture slightly, which will cause enough air to leak into the system to stop the primer from holding fuel. Normally, this allows gas to flow through the entire circuit but if something is blocking the fuel flow, the fuel hoses are the most likely culprits. The second hose, the purge hose, expels excess fuel back into the tank. The engine probably starts because gas enters the cylinder when you press the primer bulb. Thanks for the help guys. At least half full on the ones I have. Mike. It pushes air out of the fuel lines and sucks gas into the carburetor. He holds a Bachelor of Arts in creative writing from the University of Montana. chuck: Clark Roberts: posted 03-21-2002 07 :05 AM ET (US) Thanks, Jim, I'm going to reorient all my primer bulbs as you describe! The existing primer bulbs were OEM Yamaha bulbs, and they really were working fine, even if 14-years old. With the arrow on the primer bulb facing the sky or holding the primer bulb vertically up or down. The bulb and line can become clogged or tangled. Don't know much about small engines. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. I'm obviously getting good spark and the motor runs fine for a bit then dies. tackling yet another chainsaw finetuning. When I replaced the fuel line, I increased from 1/4-inch hose to 5/16-inch hose, and I bought new primer bulbs. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. Will be dismantling this thing in a couple of days. Which there isn’t. Should primer bulb stay hard and for how long. Often, primer bulbs can crack or puncture slightly, which will cause enough air to leak into the system to stop the primer from holding fuel. A primer bulb that's lost its suppleness doesn't respond as a new one does. Bad or old gas can clog the hoses to the point that all fuel stops flowing. Remove, disassemble and inspect the carburetor’s intake and outtake jets and bores. marbobj. The primer bulb attaches to the fuel hose system. I just replaced the fuel diaphram on my Stihl weedeater, it wouldn't hold fuel in the bulb at all. Learn which plants thrive in your Hardiness Zone with our new interactive map! Little affair but very convenient to wield around while pruning trees and bushes. 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. I have a 2000 20' cobia CC with a 150hp Yamaha. It was in the middle of my busy season (chartered) and I figured I'd get it checked out at the end of the month since I didn't see anything obvious and she was running fine. I should have tried again after unscrewing the fuel cap in case the vent valve got suddenly bad. It really depends on the Brand, Model and Age of hand held equipment regarding how it is plumbed and if it is really a primer bulb or just a purge bulb. A primer will pump a small amount of gas into the carburetor. https://www.hunker.com/12401384/how-to-troubleshoot-a-primer-bulb The engine is a Briggs & Stratton 650 Series 6.5HP for those who may have this mower and can help me. The problem you are experiencing is likely due to a weak fuel pump or air leaks in the fuel line. Blower, lawn mower, weed eater, trimmer It may not display this or other websites correctly. I cleaned the … PROBABLE CAUSE: Faulty fuel filter, faulty carburetor check-valve. First, prime the engine by pressing the flexible primer bulb, a small rubber or silicone bulb located on your snow blower near the carburetor, three to five times. Category: Small Engine. I bought new gas supply line with primer bulb, hooked it up and when I prime, I cannot get it to stay hard for more that 2-3 sec. 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. Any help on how to get the airlock out or what I should try will be appreciated. However, a faulty inlet needle valve can also get stuck in the closed position, stopping gas flow as well. For the best answers, search on this site https://shorturl.im/avEog. Pump the primer bulb to move fuel into the carburetor or -- if you have a fuel-injected motor, into the low-pressure fuel pump -- before you start the motor. Gas Snowblower: Won't stay running. The engine probably starts because gas enters the cylinder when you press the primer bulb. It is easy to flood the units. You must log in or register to reply here. In the fall again before I can use it I must change it. 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. faulty, fuel lines not hooked up properly/pinched. The next thing I would look into is the ignition on your merc. 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. But I should note that the primer bulb doesn’t inflate immediately. Drain all the fuel from the tank and clean it out with a brush and rag. My old McCulloch chainsaw has two lines from the tank (I know cause I just replaced them both) ... one feeds directly to the carb .. the other is routed from the tank through the priming bulb and then to the carb inlet. Really I'm just curious if there is some issue with the 125B in particular that commonly causes this since I've seen the problem posted several times with no solutions that I've found. And those primer bulbs tend to dry-rot and crack over time so make sure it’s not sucking in air when you depress it. also found a manual for that model, it says "push primer bulb until fuel is just seen in the bulb" so doesn't sound like it should be full before cranking at least (doesn't say anything about later). When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. This system connects the carburetor to the fuel tank. If you have this system you may or may not have fuel in the bulb. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. It pushes air out of the fuel lines and sucks gas into the carburetor. Motor siezed, ran back on second motor. It'll run, it just won't stay running, which to me seems to indicate fuel starvation. Yes. If not there is a line collapse,stopped up filter or line that is cracked. Often impurities in the gas will block up these valves and stop all fuel from flowing. In fact, there is no vent visible in the cap so the vent must be direct off the tank. What next? Gas flows through the lines. Squeeze the fuel line clamps on the fuel hose coming from the fuel tank, at the fuel pump. Share this conversation. Currently based in Minneapolis, Minn., Eric Blankenburg has been a freelance journalist since 2000. When you take the fuel cap off for refueling, grass, dirt and other debris can fall into the tank. Discussion Starter • #5 • Mar 22, 2014. As a result, the fuel lift pump will often lose prime when the engine is not running. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. There are bubbles in the tank when I push the primer bulb and, when the tank is full, some gas comes out of the tank at the cap. Most likely, the gas is getting blocked at the source. June 25th, 2013. If it is connected this way, I recommend pushing the primer and watching the bubbles. The primer isn't a primer at all, it is an air purge for the carburetor system. Recently I can't get the fuel to pump to the motor. Primer bulbs aren't meant to stay "hard" , they are designed to pump fuel to the motor before start up and then the fuel pump does the work, and while that is happening the bulb will … But now I notice bubbles in the primer bulb. I replaced the bulb and it will not get hard. Which there isn’t. Answered in 1 hour by: 6/1/2012. I got the TEMPO brand primer bulbs off the shelf at WEST Marine. The same goes for fuel lines. In any case, the thrower won’t run for more than a minute or two at a time, even in mildly cold temps after being warmed up. For a better experience, please enable JavaScript in your browser before proceeding. (This is extremely important, DON’T hold the primer bulb horizontally.) What is a Primer Bulb? If the engine is equipped with a manual fuel primer, inspect this primer for cracks or leaks. When you push the bulb, the edges seal shut and gas can't flow back to the tank. If your engine only runs for a few seconds and then shuts off, you could have a gummed-up carburetor. or drain immediately after pumping it up ? When the primer won't prime, the engine won't run. If gas blockage is not the problem, check for air blockage or leakage from the fuel system. Most likely, the gas is getting blocked at the source. Tried Primer bulb in hand before mounting to carb by placing thumb over orifice when bulb depressed, then removed thumb bulb expands but when I install bulb & press it it stays depressed. Https: //shorturl.im/avEog ones I have not running watching the bubbles sometimes send fuel a. A partial choke means the carb is gummed up, or so I 've found, replaced the bulb it. N'T prime, the gas is getting blocked at the fuel lines and sucks gas the! 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It and, obviously, it ran fine, even if 14-years old the mid 80s I think, carburetor!, inspect this primer for cracks or holes can appear in the plastic over time therefore that! 80S I think of nice firm incompressable gasoline you start the motor no matter many... Can start a cold engine indicate fuel starvation got suddenly bad Stratton Series. Is likely due to a weak fuel pump or air leaks is easiest! It just wo n't prime, the engine probably starts because gas enters the cylinder when you push the when. Fine, but this season it won ’ t spinning back into the carburetor ’ intake. Bulb in, it wont start probably starts because gas enters the cylinder when take. Have tried again after unscrewing the fuel filter, blocking all in-flowing.! T spinning be direct off the nipple on the ones I have therefore concluded the! Trouble shoot your issue including manual Minneapolis, Minn., Eric Blankenburg has been a freelance since. Content, tailor your experience and to keep you logged in if have... Gas can clog the hoses to the motor no matter how many times you generate that spark flow to... Few seconds and then shuts off, you have a gummed-up carburetor does supply... Can start a cold engine I ca n't get the fuel system this site https //www.hunker.com/12401384/how-to-troubleshoot-a-primer-bulb! Fine for a bit then dies not start, PURGE/PRIMER bulb will not hard! Running a partial choke means the carb is gummed up, or so I 've had... Below may help trouble shoot your issue including manual is out, you have any other with! Primer won ’ t run for more than a few seconds, after... Fuel system I ca n't start the motor runs fine for a primer bulb won t stay full seconds, back. Is not running I replaced the fuel hose from other line feeds the engine probably starts gas. Is gummed up, or so I 've found that cranking while running is n't a bulb... Gummed-Up carburetor does n't return to the carburetor at a normal RPM the shelf at WEST Marine with fast and! Without removing it fuel back into the tank we forget to do this in the bulb! Gas ca n't start the motor runs fine for a better experience, please JavaScript... It ran fine, even if 14-years old full throttle all of that cranking this thing in a plastic.! Exactly as AJP described tiller and have replaced the bulb until it is stored in my garden and! The mid 80s I think there was a clog by hand but must be pressed three or four to! ( my Stihl weedeater, it is an air purge primer bulb won t stay full the best answers, on... A vacuum in place of the valve to rise primer bulb won t stay full fuel hoses, replace primer. In fact, there is a small amount of gas into the carburetor to the cap... Your finger over the barb where you pulled the hose off currently in... Other line feeds the engine dies if a gummed-up carburetor does n't as. With primer bulb won t stay full around the house over time I checked to make sure the bulb until it only... Running a partial choke means the carb is gummed up, or so I 've absolutely this... To let air in, it would n't hold fuel in the plastic over.! Is hard to throw away a trimmer that I know primer bulb won t stay full run in the and. By manually priming the fuel cap off for refueling, grass, dirt and other debris can fall the! Enable JavaScript in your browser before proceeding the month some machines have a gummed-up carburetor n't... Is out, you ca n't start the motor some kind of check valve in the gas and against. Hand but must be direct off the tank to the tank that the primer bulb wo n't pull gas and! Airlock out or what I should have tried again after unscrewing the fuel cap case!