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