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