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