Briggs and Stratton Primer bulb (How it Works) Classic/Sprint/Series 450/500 - The Repair Specialist
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- Опубликовано: 15 окт 2024
- VISUALLY EXPLAINED
The Briggs and Stratton primer bulb is a crucial component in the carburetion system of small engines like the Classic, Sprint, Series 450, and 500 models. Its primary purpose is to deliver a surge of fuel directly into the carburetor to aid in starting a cold engine. Here's how it works:
Manual Pumping: When you press the primer bulb, it creates a temporary increase in air pressure within the carburetor's float bowl, while also drawing fuel from the fuel tank. The primer bulb is designed to be a manual pump, allowing you to press it several times to introduce fuel into the system.
Fuel Path: As you press the bulb, it pushes fuel through a fuel line or a fuel passage that connects directly to the carburetor. The increased pressure in the system causes a one-way check valve (often located in the carburetor) to open, allowing the fuel to flow into the carburetor.
Fuel Enrichment: The fuel delivered by the primer bulb enriches the air-fuel mixture within the carburetor, making it easier to ignite. This is especially helpful during cold starts when the engine might have difficulty drawing enough fuel on its own.
Starting Assistance: The enriched mixture created by the primer bulb ensures that there's enough fuel for a cold engine to start. Once the engine is running and has warmed up, it can draw fuel from the carburetor without the primer bulb's assistance.
In summary, the primer bulb is a user-operated pump that provides a quick and convenient way to assist in starting a small engine by temporarily enriching the air-fuel mixture. This is particularly helpful for cold starts, ensuring the engine fires up more easily.
Quality Briggs and Stratton Primer Bulb
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Quality Briggs and Stratton Diaphragm Kit: www.amazon.co....
Quality Briggs and Stratton Service Kit by Briggs and Stratton: www.amazon.co....
This video is basically a shortened version of my original video on 'how a Briggs and Stratton Classic, Sprint, Quattro, Series 400, 450, 500 works.
Many thanks indeed
Craig Kirkman (Owner and Creator of the 'The Repair Specialist' Channel)
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Excellent explanation.
I would just like to add one more reason the priming Bulb will not prime the carburetor. which none of the RUclips pages seem
to have mentioned.
If you replace the diaphragm and you still just suck air. It is worth removing the Bulb and checking to see if the
one way valve behind the Bulb has not popped out of its recess. The Bulb is removed by pressing in the locking tabs on each side.
Be careful when removing the Bulb, as the steel ball and spring are quite miniscule and will easily get lost if dropped on the floor.
It is quite a fiddly job, requiring small needle nose pliers or tweezers, but supergluing the rubber retaining orifice is probably the best way
to fix the problem. Otherwise, a new Carburetor may be required.
First mention of the ball bearing and spring I’ve found, I thought I was going nuts and didn’t know if it was meant to be in there as nowhere mentions it
Thank you for the demonstration sir, I am 70 years old and still learning.
Awesome 👍
Absolutely. Age is no barrier. I’m really pleased you are learning because learning is staying young. My dad is the same age as you and he is spending 2 days per week taking wrestling classes and Brazilian Jujitsu grappling. He refuses to see age as anything but a number. He fights men in their 20s and he is a real force to be come up against. Keep learning Sir, and keep strong 💪. Craig 👍
Thank you. This was incredibly well done! You should be a teacher.
I know this is an older video, but people are still viewing it. This video helped me chase down a problem I had with a new 3.5hp B&S mower for many years. It never seemed like the primer system was working properly and took many pumps for the engine to start and I think it would start after it primed it self after many pulls. I found that the plastic ring that holds the primer bulb in was not seated (clicked in) and allowed an air leak. Starts with 3 pumps now.
That's awesome that you found out the issue. Well done and thanks for the kind comment and letting me know. Craig
Respect to you for the explanation. Respect to the designers for a great little carby.
I must say your videos are absolutely brilliant your explanations are excellent
Nobody explains carburetor functionality better than you sir.
That was an excellent demonstration!! I appreciate the way you go back over things, it really helps out when learning. I subscribed and look forward to seeing all your videos. Thank you so much for producing this, it helps in understanding how things function. You are a great teacher. Thank you.
i realize I'm pretty off topic but does anyone know of a good place to watch new series online?
@Karter Clayton i would suggest FlixZone. Just search on google for it :)
@Amir Drake definitely, been watching on instaflixxer for years myself :)
Thank you sooo much. Have three of these I need to get running that needed the diaphragm and gasket. Put one in and it ran great with ether but it wouldn't prime when I held my finger over the prime outlet in the intake it would fill up the bulb but when I took my finger off it would just pump air. When I pumped it really fast all of a sudden it started working. I'm assuming it just needed to be worked since it was brand new.
Great graphic animation and explanation!
Is there a check valve in the pick up pipe to stop fuel travelling back down the pipe and into the fuel tank when the primer bulb is pressed? Very good presentation
Great video. Really helpful. Mines in bits just waiting for parts to arrive. I’m hoping it will fire right up when it’s back together.
Thank you so much for your kindness. good luck, hope it will work when its back together
- Craig
@@TheRepairSpecialist she’s back together and running like a dream. Carb and tank cleaned out. New carb gasket, diaphragm, air filter, spark plug and primer bulb. Very cheap repair and not bad for a 20 year old mower! Thanks again.
Good video. I need help to fix the one way valve behind the primer bulb. That is what is missing in my mower carb. How to get the parts for it. Any help or guidance is appreciated. It is the valve you mention at 17.09 min in the video.
great video
Wow! Nice job! Very interesting.
The primer bulb gets sucked in when my engine is running and will stall. Can you tell me why? Thanks
Is it possible for us to over prime the engine? What happens if we press the bulb too many times? Thank you.
John C yes you can overprime on this particular model/type of carburetor. Its possible to flood the engine. Just keep pulling and it will start.
My check valve came loose, not sure how to put the ball and seat back properly
Excellent explanation and graphics. I'm subscribed. Can the check valve be replaced?
Thank you so much for the nice feedback I really appreciate it. Do you mean the diaphragm valve?. Craig
@@TheRepairSpecialist I meant the check valve for the timer bulb.
Thumbs!!!!
Thank you