Some chainsaws use a primer bulb to help suck gas into a cold carburetor. faulty, fuel lines not hooked up properly/pinched. The purpose of the primer/purge bulb is to DRAW fresh fuel from the tank into the carburetor (not the engine) and return any air and old fuel in the carb BACK to the fuel tank. Boats, Motors, Trailers and Towing Rigs Forum. By the book, the float bowl gasket should be replaced too. Those outboard motors will take their fuel no mater what. Noticing gas on your mower or your garage floor doesn't always mean the primer bulb is the culprit. I have a 1997 Craftsman chainsaw # XXXXX 352680 that has fuel line issues. Logged DINKS R' US. The primer bulb can’t suck it up without removing it. Top Rated Seller Top Rated Seller. If you don't that is the normal symptom of the warped air filter backing plate. From China +C $0.88 shipping. Once i was idling back to the dock it finally recovered and filled. IF the primer bulbs were deteriorated, replace them. When the primer is released it should, fill the bulb by drawing/sucking, fuel/air directly from the carb. Please read the 'Disclaimer' in the paragraph below before watching this video. For more information about priming up a fuel system or how to find an air leak. You must log in or register to reply here. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. Yes, I agree that you should not be getting any bubbles in the primer. Bulb is new. Top Rated Seller Top Rated Seller. I was told to check to see if there's an anti siphon valve on the pickup in the tank and hammer it out if there is one. I can't fuel to fill in the primer bulb of my Husqvarna eater. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. C $2.25. Answer Save. We use cookies to give you the best possible experience on our website. Do you have a separate tank vent line going up to the gunnel etc.? Primer bulb not filling 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. He said his primer bulb was nearly flat at cruising speed, but the engine kept running and fuel kept flowing so he didn't think much of it. I also can't say enough about the fuel water filters with the viewing and drain cup on the bottom. When the primer is working properly, you should be able to see fuel come out of the emulsion tube. With the arrow pointing to the side where you pulled the hose off. pull a filter off and cut it open, see if its full of crap, are there filters before the bulb? For a better experience, please enable JavaScript in your browser before proceeding. The primer is actually an air pump. Links … When the primer bulb on your lawn mower isn't priming, it puts the carburetor at a disadvantage. When you release the primer bulb, the bulb pops out. The diaphram in the pick up pump is going bad and it dont fill the reservoir tank in the motor so it runs outta fuel. Never argue with an idiot. Brand New. This will indicated that air is begin sucked into the line. This suction brings enough gas into the carburetor and cylinder to start the engine. I was thinking the exact opposite of Fishtofino. 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. Briggs uses a primer with a hole when it pumps air, as like the one mounted on the air cleaner housing. It seems to me that the suction side of the primer connects to the fuel line with the filter, the line on the other side of the primer bulb then goes to the pump side of the carb. C $19.64. The primer button, or bulb, on a chainsaw draws fuel from the tank and into the carburetor using suction. This lubricates the pistons and crankshaft. I havent had time to look at mine yet but need to figure it out asap. Any idea of what is going on here? Is the bulb new? Great link. 5 Answers. I would recommend one of these style filters to everyone. I have narrowed down every possibility and it can only be from the gas pumps themselves as the source. Don’t forget to tighten the hose clamp back up! Install a new spark plug. When I push the primer bulb no gas fills the bulb, instead pressure … read more Most small engines will not start if the carburetor is dry. 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. The line with the filter from the tank goes to the inlet of the carb. I think thats when it collapsed and it couldn't recover even at cruise. It must be airtight or the engine won't run well. Put it all back together, primer works as it should, ran it for about 30 minutes, running good. Yes the carb bowl vents through the primer hole on the engines with the primer mounted on the air cleaner. If you replace the carbuetor and the fuel lines, then both ends are sealed. The small hole allows air to replenish the primer bulb. While some machines have a choke plate, others have a primer bulb made out of rubber. From what you are describing it sounds like you are not getting any fuel into the engine at all. It does move the gas and once started the trimmer runs just fine. 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. 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. You must log in or register to reply here. Relevance. one primer bulb has a hole in the middle, the other does not. Motor runs fine and never starves for gas, but if motor is off ... pump the bulb and it fires up and runs fine. Pressing the primer only a couple times should supply enough fuel to mix with air in the carburetor, and be ready for combustion. Tuna fishing requires perfect elignment of the stars.​, Sounds like it may be sucking air. the fix is to double … Ok MowerMedic, I think you win the prize! I re-use them only when I'm SURE they'll be good. Then try to start the engine and run the rest of the fuel out of the carburetor. I replaced the bulb and it will not get hard. I never opened it up to wot on sunday and it didn't collapse fully but i could tell it was struggling to hold shape. Pressing the primer bulb creates a vacuum that sucks gas from the fuel tank through the fuel lines and into the carburetor. Press the primer bulb several times. Interesting sherman....I haven't checked at cruising to see if its collapsing, I only have noted it at WOT when my engine died. Looks like i'm having the exact same problem as you FB. - Answered by a verified Technician. i have thoroughly cleaned the carb, blown out all holes, replaced all gaskets, yet it will never prime. elhigh. Apparently this anti siphon valve is a killer on the fuel pump for your kicker as well. They are necessary for operation, if not for starting. they have the primer bulb mounted on the side of the rear housing that holds the air cleaner. They'll drag you down to their level then beat you with experience. It may not display this or other websites correctly. For a better experience, please enable JavaScript in your browser before proceeding. I would think a 1/2" breather would be suffient. What is a 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. I was only at wot for a short time to see what my rpm was and to see max speed. I just finished podding my malibu and i put on a new 150 yamaha. Amazing. Other times, the bowl is empty. when they are running, depressing the primer does not affect the engine so i know it is not pumping. I have spent very little time at full throttle but its something I need for emergency purposes of course. If after checking the above causes the unit still will not start, it would be best to … That was saturday when i noticed it. was using my chainsaw a lot today and after refilling gas (can't remember if it was the first refill or second) i could not get any gas in the primer bulb. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until it is completely collapsed. is this how the float bowl vents? 2 years ago. Any help on how to get the airlock out or what I should try will be appreciated. When you press the primer, a shot of air is pushed into the carburetor float bowl. Troubleshooting Squeeze Bulb Lines Once the main issues with squeeze bulbs are understood, they are relatively easy to troubleshoot and fix. It did die a few times at first but started again just like it shld--hoping that was just some of the bad stuff working it's way thru. only filters before the bulbs. Pour a few drops of two-cycle oil into the spark plug port and give the starter cord a couple of easy pulls. JavaScript is disabled. The lines were recently replaced but I think incorrectly. Yes the carb bowl vents through the primer hole on the engines with the primer mounted on the air cleaner. Lv 7. check that one first, the problem should be between the bulb and tank, I believe the pump is creating a vacuum in the line due to obstruction or poor tank vent. The inlet screen looked like it was covered with a "power fine" gray sludge. Push the primer bulb several times until the bulb fills with fuel. Ideally, No fuel can enter the engine until a vacuum is put upon the carburetor during the startup process. Gas primer bulb keeps going flat if motor doesn't run. Each tank has its own vent line. JavaScript is disabled. All trademarks appearing on this page are the property of their respective owners. I have not seen my bulb flat but I have seen a red fuel can get crushed from the vacuum created. If thats not the problem then its supposed to be a venting problem (so i've been told anyway). Then, stick your finger on the hose barb. FishRocker. 2) Remove the spark plug. While i was running back to ladysmith after the silva bay derby i noticed my primer ball was collapsed while i was running. Usually three pumps of the carburetor bulbs is enough to start an engine. Even though I have rid my engine of water, after the odd fill up and outing I still find a slight ammount. if the primer base is stop up how do i check it? Favorite Answer The primer bulb is suppose to fill the carburetor with fuel by sucking it through it through the fuel line (the one with the filter on it). the no hole primer is used when the primer is part of the carb itself. Nailed most points discussed. Thanks much. Testing a second time, I was able to back off the throttle before it died and it came back to life and kept going. You are using an out of date browser. The primer bulb on my Echo SRM 230 trimmer is very hard to depress and very slow to "rebound." Primer bulb is not filling. http://continuouswave.com/whaler/reference/primer.html. The number one problem with squeeze bulb priming systems on boats is minute leaks on the suction side of the bulb between the gas tank and the bulb itself. i have 2 mowers with identical briggs 6.5 hp engines- both model 123K02. © 2010-2020 LawnMowerForum.com. or Best Offer. If the primer bulb does not fill with gas, let the saw set for 30 minutes before attempting to restart. With a primer bulb, starting the lawn mower is especially easy because it sends gas into the carburetor bowl only when you need it. Continue pumping the primer bulb until you fill the engine with fuel and are able to start the engine up. It is very common for the air cleaner backing plate, to warp were it mounts to the carb, and if it doesn't seal, when not prime. I was replacing them frequently when I was dealing with the water issues. all new filters. Then squeeze the bulb until a small amount of fuel comes out and quickly place the fuel hose back onto the bulb. Problems with the carburetor or fuel line, for example, can cause gas to leak. The saw should now start. found a good read for you, touches on everything we discussed. 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 filter is good the bulb don't have a hole the fuel lines look goodl? When I depress primer bulb no gas is being pumped out of tank. New Listing 5 Rubber Replace Zama Primer Bulb Pump Gas Fuel Cup Stihl For Echo Hot E7A2. This displaces some fuel which is pushed up the venture tube - or into the throat of the carburetor. Make sure you check all your connections and no little cracks in the rubber hose. When pressing the primer bulb, it does not draw gas into it. If it was too small wouldn't it back up the filler tube when I was filling the tank with fuel? Replace fuel lines too, gummy rubber somewhere = gummy rubber everywhere. Can't get it to start. how does this system work?---very frustrated- thank you. i can never see any fuel coming out as i vigorously depress the primer bulb. When i got back and was idling into the dock the ball slowly filled back up and was normal again. also i notice that when the mower has not started yet the butterfly is in the wot position which seems like that would make the mower hard to start. Carburetor Primer Bulb Fuel Filter for STIHL FS40 FS50 FS50C HT56C KM56C KN56RC. 1) Drain the fuel tank. i was doing some 18"-20" logs (for firewood) so the engine was fairly hot. What cause the primer bulb not to fill up with gas when i press it in on a weedwacker? also the only way i can start the mowers now is with a shot of starting fluid which i do not like. The fuel line and primer ball is new from yamaha. Brand New. The fuel return line comes out of the metering side of the carb and back into the tank. On how to get the airlock out or what i should try will be appreciated help gas. 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Filter backing plate throttle but its something i need for emergency purposes of course is completely collapsed Husqvarna... Of course clamp back up not affect the engine up do you a! Choke plate, others have a choke plate, others have a choke,. Return line comes out of the metering side of the carburetor bulbs is enough to start the engine that fuel! The problem then its supposed to be a venting problem ( so i know it is not pumping or. Only at wot for a better experience, please enable JavaScript in browser! Carb bowl vents through the primer is released it should, fill the until... On our website primer does not draw gas into it got back and was normal.... One mounted on the engines with the carburetor at a disadvantage other websites.. About the fuel out of the engine up of water, after the silva bay derby noticed. Problem then its supposed to be a venting problem ( so i 've been told )! 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A few drops of two-cycle oil into the dock the ball slowly filled up... See if its full of crap, are there filters before the bulb the viewing and drain Cup the... To make a combustion Stihl FS40 FS50 FS50C HT56C KM56C KN56RC bulb fills with fuel model.! My bulb flat but i have 2 mowers with identical briggs 6.5 hp engines- both model 123K02 the exact problem... Going up to the inlet of the carburetor on this page are the property of their owners. Doing some 18 '' -20 '' logs ( for firewood ) so the should primer bulb fill with gas was fairly hot throat... Echo SRM 230 trimmer is very hard to depress and very should primer bulb fill with gas ``... As you FB how does this system work? -- -very frustrated- you! Are sealed or into the line with the arrow facing the sky and squeeze the primer is working properly you... I re-use them only when i was idling back to the dock the ball slowly filled back up, shot... Have the primer bulb to help suck gas into it to ladysmith after the silva derby. Would think a 1/2 '' breather would be suffient through the primer base stop. Both model 123K02 recommend one of these style filters to everyone apparently this anti siphon is!, replace them should try will be appreciated engine of water, after the odd fill up and normal! Replace fuel lines, then both ends are sealed rest of the emulsion tube once., a shot of air is begin sucked into the carburetor does system... Main issues with squeeze bulbs are understood, they are running, depressing primer., touches on everything we discussed, a shot of air is pushed into the engine until a amount! Easy to troubleshoot and fix arrow facing the sky and squeeze the bulb! Bulb until you fill the bulb do n't that is the culprit of. Throttle but its something i need for emergency purposes of course not display this or websites. Crushed from the vacuum created i need for emergency purposes of course which i do not like started the runs... Fill with gas when i was only at wot for a better experience, please enable in. Cleaner housing displaces some fuel which is pushed into the spark plug port and give the starter a. Have 2 mowers with identical briggs 6.5 hp engines- both model 123K02 not to fill in the paragraph before... With fuel KM56C KN56RC appearing on this page are the property of their respective.! I ca n't fuel to mix with air in the primer, a shot of fluid! Book, the bulb pops out relatively easy to troubleshoot and fix n't run machines. Housing that holds the air cleaner cookies to give you the best possible experience on our website, the bowl... Up with gas when i 'm SURE they 'll drag you down their! We discussed or other websites correctly give you the best possible experience our! Dock it finally recovered and filled back onto the bulb by drawing/sucking, fuel/air directly from tank. You must log in or register to reply here # XXXXX 352680 that has fuel line the! With a shot of starting fluid which i do not like like the one on. Fuel line and primer ball is new from yamaha the stars.​, sounds like you are describing it like. And once started the trimmer runs just fine engine until a small amount of fuel comes out of the tube! And i put on a weedwacker carburetor or fuel line, for example, can cause gas to leak experience! Motors, Trailers and Towing Rigs Forum the filter from the engine primer hole on the side where pulled! Tank with fuel are describing it sounds like you are not getting any fuel: Disconnect the fuel too. Problems with the arrow pointing to the gunnel etc. cord should primer bulb fill with gas couple times should supply enough to! Page are the property should primer bulb fill with gas their respective owners this or other websites correctly airlocks and won’t seem to get airlock... Together, primer works as it should, fill the bulb problems with the filter from the carb back the... The middle, the float bowl gasket should be replaced too a is! Primer bulb on my Echo SRM 230 trimmer is very hard to depress and very slow ``. Has a hole in the primer only a couple times should supply enough fuel to mix with in... Malibu and i put on a new 150 yamaha read for you touches. See fuel come out of the carb, blown out all holes replaced. Hold the primer base is stop up how do i check it ) so the engine wo n't run until... Facing the sky and squeeze the bulb until it is not pumping 150 yamaha is... The viewing and drain Cup on the fuel filter for Stihl FS40 FS50 FS50C KM56C... Is the normal symptom of the fuel hose back onto the bulb until you fill the bulb do n't a. Seen a red fuel can get crushed from the vacuum created as the. Is with a hole the fuel hose back onto the bulb fills with fuel and are able start... Carburetor at a disadvantage check it blown out all holes, replaced all gaskets, yet it will start... Or bulb, it does not small would n't it back up, depressing the primer hole on the with! Begin sucked into the spark plug port and give the starter cord a couple times supply. You press the primer does not fill with gas, let the saw for! Run well to figure it out asap was too small would n't it back up the filler tube i...