Briggs and Stratton pulsa jet carburetor repair This is the best kit to get you going click to order tank and carburetor Click link to order complete carburetor. gasket kit and spring (cheap fix) Primer bulb kit
Learn how to fix your Briggs and Stratton lawnmower that does not run properly. See the steps to clean and replace the gaskets in this carburetor. Disclaimer:
Doublewide6 has a Master’s Degree in industrial technology with a specialization in Manufacturing, due to factors beyond the control of Doublewide6 and anyone featured in his videos, I cannot guarantee against improper use or unauthorized modifications of this information. Doublewide6 assumes no liability for property damage or injury incurred as a result of any of the information contained in this video or any of Doublewide6’s videos. Use this information at your own risk. Doublewide6 recommends safe practices when working on equipment, power tools, chemicals, electronics, electrical systems, vehicles, and or with tools seen or implied in this video. Due to factors beyond the control of Doublewide6, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not Doublewide6. Please support Doublewide6 by donating to his Patreon Account



49 thoughts on “Briggs and Stratton pulsa jet carburetor repair

  1. hi .. I got this same engine. its not getting gas and the prime bulb is wrecked. I noticed the tank was brown with a sludge.. just horrible ethanol crap. I cleaned everything. when the diaphragm gets old, do they just get small leaks? and is this why engine is not getting gas? thanks !!

  2. DW6, how do you replace the primer bulb seat and check valve. Found out that this can prevent your carb from priming. Help would be appreciated.

  3. I have one of these but the plastic thing that the linkage attaches to broke..can I order a new one or just order a new carb..and if I need a new carb do you know the name or number on it..
    thank you. love this channel

  4. This is a good video, however for all who look and are reading ..
    the short answer is the plastic carb base warps..
    This is most likely the real culprit..
    The carb is plastic of course and warps slightly at the gasket side, the
    large hole side(the side by the large hole), between where the screws
    go through, not the tank. place a straightedge across the screw holes
    and you may likely see daylight. apply a thin layer of silicone sealant
    that is gasoline resistant and the gasket and that should most likely
    help the problem in the long run. Put it together, but don't tighten the
    screws all the way until 24 hours later to let the sealant to set.

  5. I've found it is better to test the prime prior to reinstalling. 9 rebuilds work just as you have shown, then there is one that needs a new carburetor. Keep up the good work.

  6. Hi doublewide6, the lawnmower I have has the same setup, but when I was looking at my parts list for my correct diaphragm part number, I noticed that there is a seat-inlet, Where is that seat located?

    Thank You

  7. Thanks a lot , that surely , save me some money , I just strip down clean and wash tank leave to dry out , and i'm , running as new . Found the parts , but they were looking good. Thanks again.

  8. Hi,

    Working on the pulsa jet carb from a Briggs mod 10T802-0776B1 engine. Customer said was leaking gas around the carb. I installed new gasket and diaphragm but when I pushed in on the primer bulb, gas came out of a small port in the side of the carb facing the fuel fill cap. I pushed in what appeared to be a small BB but now, when I pushed in the primer bulb, it does not come back out. I can send picture of port if you can give me an address.
    This is a new one to me, any suggestions?
    Port Hadlock, WA

  9. All I can say is thank you!!! You saved me a couple hundred dollars as I recycled my neighbor's used lawn mover because "IT DIDN"T WORK"  so I could have it for free.  Took me 20 minutes to fix and I already cut my new grass I layed down as sod a few weeks ago!!!  GREAT VIDEO!!!!!

  10. Great video!  I was able to get my 12 year-old Murray running again.  It still runs a bit rough, but at least it runs.  Question:  I replaced the primer bulb with a new one that has a tiny hole in the bulb.  I know it's designed that way, but why didn't my old one have a hole?  I hate that I get gas on my primer finger, but I guess it's a small price to pay for not having to borrow my friend's mower anymore.  Thanks!

  11. Doesn't have to be "Hercules Tight", I like that term. Got me a Murray 22" with a 4.6 Briggs and Stratton. I'm going to do the same Carb' overhaul as well. Thank for posting…

  12. I have two lawnmowers, (both B&S 3.75 engines) one starts then dies right away, the other will start if I pour some gas directly in the carb and it will stay running but surges. I assume they both need new diaphragms, or at least the carb cleaned out. I had watched about 10 videos and this one is the best! Thanks a lot! I'll do this to both tomorrow and let you know how it goes. Otherwise any other suggestions to what I mentioned on either? Thank you again!

  13. good video, you can also pop that pick up jet out that is behind that screen and clean it out better as well as the cavity it sits in, i used a tiny flat blade. i use welding tip cleaners to clean out those ports as well as spray carb cleaner and shop air.  i also like your take on fuel in tanks, you never know and it eliminates one possible issue by just replacing old fuel.

  14. Apparently I did't see the spring reinstall under the gasket or diaphragm. Otherwise good information. Please show the spring install.

  15. Just because you have a 5 gallon gas can that does not mean you need to buy 5 gallons of fuel. If you only use 3 gallons of fuel during a season then only buy 3 gallons. If you have any left over at the end of the season put it in your vehicle and use it up. Do not let it sit in the garage and get old and stale. That is asking for problems. 

  16. Old bad gas causes problems. When storing gas or a vehicle it is important to use it up yearly if you added Stabil or Seafoam to it when you filled up. It is easier to run the vehicle out of fuel and put fresh in yearly than deal with the problems that bad fuel causes.  Most small engine problems are due to gas going bad and not because of ethanol. Small engines have ALWAYS had problems with stale fuel gumming up the carburetor when left in for long periods of time.
    When a small engine like a lawn mower, leaf blower, chain saw, is being put up for the winter run it out of fuel before putting it away.  In the spring when filling your gas can for the first time add some Sta-Bil or Seafoam to the gas to extend its life. Gas generally starts to go bad after 30 -60 days. By adding the fuel stabilizer it will extend its life. When you put equipment away for the season run it out of fuel first. 

  17. I have the exact same carb but with 2 springs. I am not sure how the springs connect, that's why I'm here. Will do a thorough cleaning when I get the chance

  18. This video is very informative.  However the cause of my problem was something else.  My mower suddenly lost power and started surging from almost stall to half speed.  After looking at repair videos I took it apart.  When removing the carb I noticed that the intake pipe from the carb to the engine block was loose.  There are 2 bolts holding that pipe on the motor and these were slack enough to allow air leakage and spoil the fuel/air mixture.  Tightened them up and it runs like new.

  19. My B&S would also start with a prime, then die. Tried pressing the primer to keep it running and after about 2-3 minutes of that, she started to run right again without the primer. First I took off the carb to check the diaphragm and it looked fine. I decided not to buy it for fear it wasn't the problem. Put it back together after a clean out and it still did the same thing. Then I read a guy's thread who said he did the bulb thing and it worked for him so I decided it couldn't hurt to try and behold, it worked. Glad I didn't buy the diaphragm.

  20. The governor spring should have been removed at 1:20 before removing the tank/carburetor from the engine.  That spring looks like it's been abused and is in bad shape.  If the spring gets stretched, the engine will run slower than design speed and will produce less power; the only fix for that is to replace the spring.

    I stretched the spring on a Briggs & Stratton engine by accident recently when I ran the mower into a bush and a branch hit it.  The mower barely ran until I replaced the spring.  Better mowers put a shroud over the area to prevent this.

  21. FWIW this is a pulsa prime carb, pulsa jet on the vertical shaft engines had an automatic choke and a mixture adjustment needle instead of a primer bulb and fixed jet. There was also the vacu jet which didn't have a fuel pump diaphragm.

  22. I bought an earlier version of this lawn mower at a yard sale years ago. I didn't have anywhere to store for a long time, so it spent winters out in the snow. Still started every spring. Great video.

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