This is what happens if the Purge Primer Bulb - Pressed too Many Times!
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- Опубліковано 26 лип 2024
- * VISUALLY EXPLAINED
Pressing the purge primer bulb on your small engine or outdoor power equipment too many times can lead to over-priming. Over-priming can cause several issues, including:
Flooding: Over-priming can force excessive fuel into the carburetor, leading to a flooded engine. A flooded engine won't start and can result in fuel entering the combustion chamber and diluting the engine oil, causing damage.
Difficulty Starting: An over-primed engine may be challenging to start. The excess fuel can create an overly rich fuel-air mixture, making it hard for the engine to ignite.
Spark Plug Fouling: The rich mixture can foul the spark plug, reducing or preventing spark, which is essential for combustion.
Poor Performance: Even if the engine starts, it may run poorly, with symptoms like rough idling, misfiring, or stalling due to the incorrect air-fuel mixture.
Smoke and Excessive Exhaust Emissions: Over-priming can lead to excessive smoke and emissions, as unburned fuel enters the exhaust and burns off.
It's essential to use the primer bulb as instructed in your equipment's manual, usually requiring a few pumps or until you see fuel in the bulb, to avoid these issues. If you accidentally over-prime your engine, you can try starting it with the choke engaged to help clear the excess fuel. If problems persist, you may need to clean the spark plug or wait for the excess fuel to evaporate before attempting to start the engine again.
Many thanks indeed Craig Kirkman (Owner and creator of The Repair Specialist and it's copyrighted content).
Website: www.therepairspecialistonline... #lawnmower #gardening #repairing #savingmoney #chainsaw #Chainsawrepair #oil #smallenginemachines #DIY #howthingswork Please check out my amazon shop. I have recommended some useful items from Amazon below. I guarantee you that these items are the sorts of things I use on a daily basis so I know they are good. I have to be careful in recommending products because I have my name and credibility at stake. So I will only recommend good products. www.amazon.co.uk/shop/therepa...
#EnginePriming #PurgePrimer #CarburetorFlood #EngineFlooding #BulbPumping #FuelFlooding #SmallEngineTroubles #OverprimedEngine #EngineStartingIssues #PrimerBulbProblems #FloodedCarburetor #EngineMaintenance #CarburetorRepair #EngineService #PrimerBulbDamage #FloodedSparkPlug #EngineTroubleshooting #FixingFloodedEngines #SmallEngineCare #ProperPriming - Авто та транспорт
You provide explicit and extremely explanatory insight into how it works. Your approach to the why and the wherefore amazes me. You cover everything thoroughly all the while...................keeping it interesting and drawing me in for more. Heartfelt thanks. You are incredible at what you do !
The explanation was very good, as was the previous video I watched about why an engine might need choke just to run. However I think an omission may have been made.
You mention Purge Primer bulb.
I stand ready to be corrected, but I think they are two different animals. The Primer bulb is exactly what you have just described, a means of giving a partial flood to the inlet manifold as a means to give the engine adequate enrichment for it to make its initial start. with a carburettor that does not have a choke flap as part of the design by pumping excess fuel into the carburettor.
However a purge bulb while it may look identical, is a means of SUCKING fuel through the carburator so there is adequate fuel within the carburettor when you use a choke to enrich the inlet manifold area. It does not matter how many times you pump a purge bulb such as used on Sthil chainsaws or brush cutters that use a choke device, they will not flood, as the fuel simply passes through the one way valves in the carburettor back to the fuel tank.
That's exactly what I was thinking. The only way a 2 cycle carb can flood is if the priming forces the needle valve open against the spring pressure and I didn't think it could. That's why it's called a purge valve as it purges the air from the lines and carb with the excessive fuel going back in to the tank. A primer actually squirts fuel in to the intake.
You Are correct.
Yes, I can confirm this is correct also, believe me when I say that I know.
I love your videos, I have really struggled to learn mechanics despite being so interested in it. Your videos just make sense
Thanks for all of your videos. Helps even us who have worked with these things for years.
I’m changing my primer bulb due to breakage. Then your video came up. Thank You for sharing your exquisite knowledge with us. Super Fantastically Awesomeness Extreme is what I’d like to say. Thank You again.
What an excellent video. Your videos are a tremendous help to understanding how components work to definitely help in the troubleshooting process. Small things to look for are such a tremendous help. Thanks for taking the time to explain. 👍
excellent presentation. I really like the attention to detail making it easy to understand Thankyou. Henry
This is the 3rd video of yours I have watched and I must commend you on your precise and easily understood explanations.I have learned so much on 2 stroke carbs! I am now going to trawl through your tutorials to learn how 4 stroke carbs for small engines work.Many Thanks
Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍
8:30 actually you are wrong, fuel is never pushed into the throat of the carb. If it is then you have a leaking check valve on your carb. The bulb on a 2 stroke like this is called a purge, not a primer. You purge the air out of the carb circuit. The choke is what pulls gas into the throat of the carb. You can push a purge bulb 1000 times and never flood the carb.
If you take the air filter off and look into the carb you can see the fuel squirt Into the intake manifold tube. At least for this type I’m not sure of the other ones.
So if you press the bulb too many times and it's too much gasoline in there what can you do to fix it?
Perfect tutorial, wish I heard these wise words years ago, would have saved many a flooded engine 🙂
Your illustrations are the best and I have seen on here. Thank you.
Incredible explanation sir. Best teacher I've had
thanks so much :) im so Glad you like find my videos useful
-Craig
Great job on explaining how it works and what to look for.
Did a really good job 👏
You make things very easy to understand, thanks for all your time.
Andy.
My mission this morning was to find out why my Stihl carburetor has two fuel lines. You answered my question. Thank you.
Thanks
Thanks, useful as always.
Your videos are so great. Clear, precise and thorough. Thanks!
Very well explained and interesting at all times
Very helpful and clear , great work ;o)
Wonderfully explained. Thank you.
Excellent again !
Hello, you make very interesting and useful videos, clear and concise! Can you make one about how to adjust a Two Stroke Cycle Carburetor with a Single Adjustment Screw for a ideal air and fuel mixture? Thank you!!
Again, a most excellent video! Good job!
Thank you so much for the nice feedback. I really appreciate it. Craig
Thank you so much, Sir. Now I understand.
Your the man! Super great video and helped tremendously!
excellent explanation. Thanks
Thank you very much for explaining the function of the primer bulb . We are told by another small engine site that the primer is only on 4 stroke engines and is called a purge on 2 strokes because it only expels the air so fuel doesn't actually enter the engine. This has puzzled me up to now how this can be, but your excellent video has clarified things for me
Great video. Learned a lot.
awesome video ive learned a lot !!!!
Brilliant - I was told it didn't matter how many times I pressed the primer bulb !
That answers a lot !
Many thanks.
Paul's comment reminds of a question I have. Is there a difference between priming and purging? Seems to me that a system with a choke mechanism will need only to have the fuel line purged of air because choking the carb will cause such a low pressure in the venturi that enough gas will be drawn up for combustion. Contrarily, a system without a choke will need to be primed. Perhaps -- and I'm thinking out loud -- Paul's friend told him it doesn't matter how many times you press a PURGE bulb, because all a purge bulb does is clear the line of air, it doesn't actually draw gas up and deposit it into the reservoir before the venturi.
On Two stroke diaphragm carburetors made today you cannot over prime/purge! He is wrong with his description, there is check valves that prevent fuel from coming out the venturi.
He actually explains it in another one of his video's. ua-cam.com/video/jalfpoldyo0/v-deo.html
It depends on how technical you want to be, some manufactures call it a purge/primer bulb, essentially it does the same thing. I'm referring to small diaphragm carbs found on handheld equipment. Not carbs that use a float bowl, they actually pressurize the bowl to make fuel come out into the venturi.
Very well explained !!
Glad it was helpful! Craig
Excellent 👍👍👍
You are the man craig !!!
Thank you :D
-Craig
Fantastic explanation with superb graphics that are sure to help anyone trying to understand how small engines are fueled. 👍‼️👍
Good teaching
Great video
Thank you for your feedback I really appreciate it. Craig 👍
Thanks - much appreciated
You're welcome!
In the video named: "How a primer bulb works - Purge Primer Bulb - HOW IT WORKS - (stihl chainsaw etc)
" at 13:51 it is said:
"We might say: When the primer bulb is pushed in fuel is pushed back up this way, why doesn't it come out this jet. Well, there is a very small valve there on this jet and I can show you, there it is. .... Only when the engine is running does that valve open enough to allow fuel to go into the venturi to mix with the air that is rushing in, to atomize it."
Can you do a video on the pick up tube and what happens when it is plugged and what can be done to unplug it when it has had fuel dried up and plugged it.
Excellent. Nice
Im glad you enjoyed it, Thank you for your kindness
- Craig
Thanks
Your explanations and diagrams are just fantastic! Thank you. Now if I can just figure out why no gas is going into the motor?? More gideis to watch.
Thank you!
Thank you to 👍👍
This is very helpful. However, i have a Honda gx25 trimmer that won't rev up. A video on that will be helpful too. Thanks.
Do you have a video that explains how a three line primer bulb works? I have a TroyBilt trimmer, 4 stroke engine. I had occasion to remove the carburetor and lost track of which line went to which position on the primer. I can't seem to get it figured out.
ive often wondered if the metering diaphram pulses up and down everytime the piston goes up and down or does it work up and down with throttle responce thanks . i really enjoy this channel its the best !!
In other words You flood the motor , mine says 3 but i was doing it 10 LOL it aways started but I won"t do it any more
What is the problem when the bulb never empties of air? The engine bogs out initially but eventually pulls properly.
carberreta...brilliant
I have problems with a Troy bilt four stroke cultivator. Seems the primer isn't delivering fuel to the right spot in the carb although the primer appears to work fine. I get a no start, put a little fuel in the plug hole and it fires right up and stays running. Very frustrating. Thanks for all your great videos.
Should you a lot of air bubbles in the primer Bulb when its running/ it runs like new at idle but under a load i it like it doesn’t have enough power
top vid bud
Thankyou for the clear description on the 2 stroke and the only question i have, is that you pump enough times to see full fuel in the return line BUT how many pumps after do you need to inject the right quantity of fuel in venturi ?
The primer (air purge valve) will never introduce fuel into the venturing. The primer bulb will only circulate fuel through the carburetor, ready to be used. To introduce fuel into the motor, it can only be done when you open the throttle.
This is very interesting! even though I have a DIY channel, my knowledge is not on small engines. I swapped out an old carb with a new one, the primer bulb fills with fuel and the return line pushes fuel back into the gas tank. I'm not howver seeing fuel in the inlet. the engine won't start yet so curious what the issue could be.
I have echo blower I have to press primer bulb 20x to get blower to run.what think problem? Thks
If old fuel has gummed up the primer or something is wrong with the primer system, the bulb my require more fuel to start than the three pushes. What I have found is people do not FULLY push the bulb before allowing the bulb to come back all the way, resulting in insufficient fuel intake. On a two stroke, if there is any air leaks in the system, air will be taken in to the system and making the engine hard to start. It may take more pumping to start, or due to a cracked fuel line, refuse to start. Ethanol in your gas will draw moisture and that moisture causes corrosion and even alge growth in the fuel bowl if the small engine has not been run in several seasons.
Would you be able to answer a question I have, I recently brought a petrol strimmer from SGS and I had to return as the unit was too heavy for me to use. When sgs received the item back after I confirmed I did not use it try to, they are saying as there was fuel in the priming bulb they can not expect my return as they are saying I put fuel in it, and attempted to start it, which I did not. My question is would there still be fuel in this bulb left over from SGS testing this unit as surely they would have tested it. I would really appreciate your thoughts. Many thanks.
OK when you going to one on 2 stroke scooter carburetor as I need help tuning this better pls. But enjoying the video good break downs and advice
ABXstriker u
I pressed the bulb too many times on the lake today with my outboard engine....
Almost got stranded but after some waiting and pulling the starter 30 times it came back to life...
Wont be pressing it too many times after that near desaster😅
👍
I have a problem with my chainsaw. When I press bulb fuel squirting out of fuel tank vent, pressing it several time generate positive pressure in fuel tank and sir gushing out once fuel tank cap unscrewed. This happened after I have changed fuel line??
You have dirt in your tank and clinging to the filter. Oh the humanity!! Thanks for the explanation.
My primer bulb is stuck in and will NOT release itself, is it safe to say maybe the diaphragm needs replacing?
Once I see gas in the purge bulb is the time to stop pressing the bulb and start the engine. I always thought excess gas just back to the tank.
HI. Yes, you are correct. Most of the fuel does return back to the fuel tank, but a small proportion does eject into the inlet on some machines. I will make another video explaining this better. Thank you for your comment. Craig 👍
Why don't they put primers on pressure washers? Seems it would make them easier to start
I'm trying to repair a chainsaw the brand is efco. No model can be found. It doesn't have a primer bulb and one metal pipe from the carburator is closed by a rubber cap. Is this natural. The brand of the carburator is Walbro. It is difficult to pull out and feel like a four stroke one. Please explain why?
How could you possibly know (especially for the 2-stroke)? Imagine being shrunk down and travelling in water through one of those things! Who invented them? How? I bet Einstein didn't/couldn't. Maybe they, like living cells -which make carbs seem as simple as a toothpick --- just happened by chance. Yeah, that must be it.
Now, every time I press those little bulbs, I will obey the makers' instructions, and think of and thank you for this marvellous testimony to Intelligent Design. Wow.
Dunno what's happening with those strikethroughs. All I did was run a couple of hyphens together to make a dash. Now to go press some bulbs - and I'm not talking tulips.
I have a brush cutter that will not start good compression , good spark and a new carburetor . The cylinder bore is undamaged but none of the experts on these machines tell you how to set the needle in the venturi or a starting point to set the mixture screw. I have two out board engines for my boat which I maintain one I have done a complete (unnecessary) strip down and rebuild to check any possible hidden problems, but this brush cutter has beaten me.The only thing I can think of, is using outbord two stroke oil has caused a problem within the carb as OB's run cold and garden tools run hot. Any one with any idea's
In your 2 stroke carb demo you have got the intake and return the wrong way round. ;)
I like this theory - I have another one and Mine is better because although your air purge bulb is good advice - An Electric Dewalt Chainsaw doesn't need Priming - I mention this because 2 years ago I switched from petrol chainsaws to electric Dewalt Chainsaws and - I know this is going to sound totally unbelievable but I've had no petrol problems since - I did once get all the way to the top paddocks and find I'd left the Dewalt battery at home - but that's not quite the same as over priming.
Solar panel,reg, inverter, Dewalt Charger, Dewalt Chainsaw, Dewalt Tree Down, Dewalt Firewood from the Sun.
OK lets try the other way - the petrol way
Expensive drills are bought in to find and suck out the carbon filled oil.
The carbon filled oil is distilled like we would alcohol to make petrol.
The petrol is used and wood is used but so is all your world wide carbon emissions.
So lets go back to Green Energy.
A Dewalt saw is quiet, draws no attention, cuts right to the end of the battery well past the chain and is Pleasingly light and easy to use.
As opposed to the petrol powered saw, that leaves your ears ringing, needs you to personally own an oil company or pay through the teeth for it and is killing the planet.
!!!!!!So - back when everything turned to shit when starting a post hole borer it was flooding - I knew that but I didn't know how and why it happened and Thanks to you I now do. !!!!!!
Please answer my Hypothetical question: I do have a Dewalt 56v chainsaw, I live on Solar - Why would I want to go back to a petrol saw?
You finished on The soapbox?
YOU KNOW WHATS UP THANK YOU HAVE YOUR SHIT TOO,GETHER
ಥ್ಯಾಂಕ್ಸ್ ಫಾರ್ ವಿಡಿಯೋ
I have an old Go Kart with no Primer Bulb. How could I add one? The gas cap has a small hole in it and I use a tube to blow air into it to get the carburetor to prime.
Hi. Unless you can find a replacement carburetor, with a primer bulb, that fits your particular engine then I personally wouldn't try to fix one in. The reason being is that it could make much more work for you. I.e. if you were to mistakenly cause some damage or just slightly disrupt something within the carb, which could ruin things for you and cost you more money. If your engine needs this extra fuel you are blowing in then this tells me that something that should be right just isn't, and that's the issue. What I mean is that it seems that the cold start system is not functioning as it should. If the manufacturer felt that your particular engine needed a primer then there would certainly be one on there. I agree that it would be beneficial in this case to have one, but I would personally look into how I would fix the cold starting issue before anything else. Does it have a choke? if so is the choke manual or automatic? Are the linkages correctly connected to choke? Is the choke opening and closing enough, as it should do? If you take a real close look you might find a problem here. I, personally, would start there and see how you can progress with it.
However, in a very small number of cases I have known people place a small inline manual handpump in the fuel pipe (between the fuel tank and the carburetor). Before they start the engine they give the pump a few pumps to get fuel into the carb (in a similar way to you blowing it in). You will have to decide if this will be ok for your engine and find the pump with the size and shape that will help you. Again, I can't say I have done this myself and can't tell you it will be ok to do so. I have only seen it done by others. Just letting you know, to help with options, that's all!
Ultimately though it's your decision.
I hope this helps.
Craig
Hi
My primer bulb is pressuring up after 3 pumps. I put a new carb on and same thing happening. Removed the return to tank line to see if blocked but same thing happening.
Homelite 38cc chainsaw.....?
I will do a video on this, but for now did any fuel come out of the return pipe when you press the bulb? i take it that it didn't?
- Craig :)
i was advised to just pump the bulb UNTIL you see petrol in the bulb. yes or no?
Do you have a video on the primer bulb that gets sucked in and stays like that for a little while or you prime and prime and eventually it fills?
Same problem, did u figure it out?
@@mblake0420 I replaced the primer bulb as it had a crack in it and you would think that it just wouldn’t suck fuel in.
What about carburetors that have Purge bulbs on them??
so I poured fuel into the lawn mower carburetor, it started once, and not again. I think I need that video about cleaning it out, because I replaced the diaphragm and it all looks ok but still doesn't start.
This may be hard to believe , pushing the primer 2 sessions of 280 strokes to successfully prime the DD 13 , DD 15 , or DD 16 .
Wow, that is a lot of Primes. It sounds like there may be some issue with the priming system. DOes the engine run ok after it has started? or does it run un-even, surging? Craig
@@TheRepairSpecialist Looking for my paperwork , it came in a DD filter box .
You know that if you pump it to many times the fuel will go back down into the fuel tank not flood the carb
This is way better than watching those empty Hollyweed movies...
Car bo RETUrrrrr
mr manager Cabo rat or
Or in Australia it's just "carbie" for short.
Carburrehtur.
Ï9
Basically, you flooded the engine. Duh!
😂👍
Ohh bull.ha ha ha haha 💔😆💥🔫😁
😂👍
3:20 before he even gets to the point
4:30 before explaining what happens