Question about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

1 Answer

I have a weedeater lawnmower with a 5.0 briggs engine. It will start with just a couple of pull but won't keep running unless there is a FULL tank of gas. changed gaskets and then carb---still same problem--oil fine--new gas--anything else I can try?

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  • Roy Cagle
    Roy Cagle Apr 08, 2011

    Is there a clean NEW carb on this engine? Post back. I want to help. I will see your comment and reply.

  • jiminark Apr 09, 2011

    brand new so is the gasket--also changed spark plug

  • Roy Cagle
    Roy Cagle Apr 09, 2011

    Is this a unit with the gas tank on top of the other words, it uses what is is called a diaphragm carburetor, not a float bowl type?

  • jiminark Apr 10, 2011

    yes it is ----

  • jiminark Apr 10, 2011

    well didn't read that right ---carb is on top of gas tank

  • Roy Cagle
    Roy Cagle Apr 10, 2011

    My mistake. I see. Have you checked the settings and adjustments on the new carburetor? Have you checked the filter screen and pickup tube in Figure # 6 in the following tutorial? That may explain part of the full tank only operating conditon. Post back please.
    I will admit to I've never serviced one of these diaphragm carbs.

  • Roy Cagle
    Roy Cagle Apr 10, 2011

    This Briggs troubleshooting guide lists a "warped fuel tank" as a possible cause for the engine to not continue running. A guess a good flat-edge is needed here...loose screws are also mentioned...a vacuum leak of this sort would cause this. Here is the trouble table:

  • jiminark Apr 10, 2011

    couldn't access that site but sounds feasable---will check and let u know

  • jiminark Apr 10, 2011

    just so you will know this carb is plastic single unit with no adjustments



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  • Briggs & Str... Master
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Does it stop fuel level always the same in tank this really sounds like a vacume leak

Posted on Jun 24, 2014


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Posted on Jan 02, 2017

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SOURCE: Gasket for briggs and stratton

I recommend  Jack's Small Engine Repair; they have always had the detail part I needed and their prices are among the lowest.
They will probably have an illustrated parts page for your model.

Posted on Mar 22, 2009

SOURCE: Briggs and stratton 4.5 hp ( 10G902 ) starts great

Try draining the carb and gas tank into a small plastic bowl and look for water in the fuel. I you have a diaphragm type carb it might just need a new diaphragm and spring.

Did the stumble start right after refueling? If so then your gas can may be carrying some water too. It happens. I have seen gas can with INCHES of water in the bottom! True story. I went to a customers house after she had both her walk behind and rider stop running. She said both were fine until she refueled and start. I looked at her gas can and it was terrible!

If you are trying to clear the main jet you need to get inside the carb and clean from the fuel inlet side. Bowl carbs usually have removeable jets that you can look through.

Good luck and be careful!

Posted on Jul 13, 2010

  • 1 Answer

SOURCE: briggs & stratton 550 / surges, gas hog

check your air filter. If it's clogged, the engine will spool up to keep from dying, run for about 15 seconds, then it will happen again. If that's it, just clean the air filter. Solved my problem

Posted on May 17, 2011

  • 1 Answer

SOURCE: How to change oil in a Briggs Strattton 550

Under side. There is a lone bolt under the blade

Posted on May 28, 2011

  • 7482 Answers

SOURCE: I have a Bolens Model

Hi JustSomeDude...

Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
NOTE: Before you dissemble the carburetor:
Make sure you mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you dissemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
Also make sure you are using fresh fuel
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank and run for short periods of time.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor rebuilt that should solve your problem.
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Posted on Jun 27, 2011

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