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Need help weed eater mower

#1

1967

1967

Hello, fixing this one. Has Briggs 12L9020667 in it. New carb, plug, filter, gas line and primer bulb. Only start with starter fluid, keeps running after. Don't start with primer bulb, replaced it twice. Carb is identical to hold one. About to give up on it. Thanks


#2

StarTech

StarTech

Primer base gasket not sealing due the primer either warped or over tighten. Look at the gasket impression and add a wedge gasket to back of it in the area of none contact and retry.


#3

1967

1967

Will give this a try. That's a new one for me. Thanks.


#4

1967

1967

1967 said:
Will give this a try. That's a new one for me. Thanks.
Click to expand...
Tried, same results. Darn....


#5

smalltimerpm

smalltimerpm

1967 said:
Tried, same results. Darn....
Click to expand...
New gas line on both sides of primer? To and from tank? To and from carb?


#6

1967

1967

smalltimerpm said:
New gas line on both sides of primer? To and from tank? To and from carb?
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It's a mower, Walmart Weedeaater. Only 1 gas line tube. Briggs Stratton engine with primer bulb.


#7

smalltimerpm

smalltimerpm

1967 said:
It's a mower, Walmart Weedeaater. Only 1 gas line tube. Briggs Stratton engine with primer bulb.
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Oh yea...must be one of those plastic carbs.


#8

1967

1967

smalltimerpm said:
Oh yea...must be one of those plastic carbs.
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Nope, metal. Got new one, compared to old one and all is same. Previous post suggested that gasket was not sealing/ to tight; put new gasket on and get same results. Just a hobby I got to fix and sell but this one has me puzzle.


#9

smalltimerpm

smalltimerpm

1967 said:
Nope, metal. Got new one, compared to old one and all is same. Previous post suggested that gasket was not sealing/ to tight; put new gasket on and get same results. Just a hobby I got to fix and sell but this one has me puzzle.
Click to expand...
Sounds puzzling to me also...did you replace all of these components because it was doing the same symptoms it is now.


#10

1967

1967

smalltimerpm said:
Sounds puzzling to me also...did you replace all of these components because it was doing the same symptoms it is now.
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Got it not running at all. I flip them after fixing. All looks good so I don't know at this point.


#11

I

ILENGINE

1967 said:
Nope, metal. Got new one, compared to old one and all is same. Previous post suggested that gasket was not sealing/ to tight; put new gasket on and get same results. Just a hobby I got to fix and sell but this one has me puzzle.
Click to expand...
On that mower it is common for the air filter backing plate to warp and not seal between the aif filter housing and the carb. which has to seal for the primer to work. the fix isn't to replace the gasket. the fix in most cases is to double gasket it. Try removing the air filter and looking into the carb while pushing the primer you should see gas squirt up from the bottom of the carb venturi from the emulsion tube. No gas then primer not working and won't start cold.


#12

1967

1967

ILENGINE said:
On that mower it is common for the air filter backing plate to warp and not seal between the aif filter housing and the carb. which has to seal for the primer to work. the fix isn't to replace the gasket. the fix in most cases is to double gasket it. Try removing the air filter and looking into the carb while pushing the primer you should see gas squirt up from the bottom of the carb venturi from the emulsion tube. No gas then primer not working and won't start cold.
Click to expand...
Just tried suggestion. Double gasket, new primer bulb. No gas from emulsion tube. Bad carb?


#13

1967

1967

1967 said:
Just tried suggestion. Double gasket, new primer bulb. No gas from emulsion tube. Bad carb?
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Then again, if carb faulty, why would it run fine when started with carb cleaner/ starter fluid....


#14

C

CraigH

I think the answer to your question about running it on carb cleaner would be the fact that you're introducing fuel (carb cleaner/starter fluid) directly into the air passage where the fuel (petrol/gas) isn't getting to.
Have you cleaned the jets thoroughly and blown all passages out on the carb?
Also, may be worth soaking the carb in some cleaner overnight to help it soak/penetrate.


#15

1967

1967

CraigH said:
I think the answer to your question about running it on carb cleaner would be the fact that you're introducing fuel (carb cleaner/starter fluid) directly into the air passage where the fuel (petrol/gas) isn't getting to.
Have you cleaned the jets thoroughly and blown all passages out on the carb?
Also, may be worth soaking the carb in some cleaner overnight to help it soak/penetrate.
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Hi Craig, this is a new carb, right out of the box. Will look at the jets , didn't think I would need to. Thanks


#16

C

CraigH

Fair play, if it's new, it 'should' get fuel through it...
Have you tried the carb off the engine, just hooked up to a bottle of fuel or something to check that the bowl is filling with fuel?
Have you accidentally messed around with the float valve as it may be shutting off before fuel can get high enough?


#17

C

CraigH

I've just re read the op, so it will run fine, its getting it started that's the problem?
Ans the new carb is causing the same issue as the old one?


#18

StarTech

StarTech

1967 said:
Just tried suggestion. Double gasket, new primer bulb. No gas from emulsion tube. Bad carb?
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Doubling the gasket doesn't work. As I said look the installed gasket and you will see on one side where there an area of non contact. This where a wedge shape gasket is applied on carb side on the gasket to apply additional pressure. Center of wedge is the full thinkness of the second gasket and then thins to zero on each each. A little wood glue hold the gaskets together until bond under pressure together. Once the wedge gasket is made you tighten the two retaining screws just enough to get the primer to shoot gas out the nozzle in the center of the carb throat.

Hint > you will need razor blade perferable a backbone version to make the wedge.


#19

1967

1967

CraigH said:
I've just re read the op, so it will run fine, its getting it started that's the problem?
Ans the new carb is causing the same issue as the old one?
Click to expand...
This thing was shot when I got it. Old carb beyond cleaning/ not worth the time. Think will have to try gasket trick as per Star Tech. Let you know when it gets warmer down here... working outside.


#20

smalltimerpm

smalltimerpm

1967 said:
Got it not running at all. I flip them after fixing. All looks good so I don't know at this point.
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Where exactly you order that carb from?


#21

1967

1967

smalltimerpm said:
Where exactly you order that carb from?
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Order all from Amazon. Check the specs and hope for the best. No issues until this one.


#22

B

bertsmobile1

It is not the carb that is the problem it is the AIR FILTER HOUSING which warps because idiot morons do it up too tight
You can not get a proper feel for the fasteners using power tools and you arn't a real mechanic unless you have a 200 ft lb Dewalt or Snap On power driver which you use on fasteners that can be done up with tweezers
So the housings warp
I used to frig around customizing gaskets but now days I have a different idea.
If the owner does all of the maintenance then they can pay for their own stupidity & replacement housings get fitted
If it was done by a supposedly professional workshop and the owners is a pensioner / widdow etc I straiten out the housing.


#23

1967

1967

bertsmobile1 said:
It is not the carb that is the problem it is the AIR FILTER HOUSING which warps because idiot morons do it up too tight
You can not get a proper feel for the fasteners using power tools and you arn't a real mechanic unless you have a 200 ft lb Dewalt or Snap On power driver which you use on fasteners that can be done up with tweezers
So the housings warp
I used to frig around customizing gaskets but now days I have a different idea.
If the owner does all of the maintenance then they can pay for their own stupidity & replacement housings get fitted
If it was done by a supposedly professional workshop and the owners is a pensioner / widdow etc I straiten out the housing.
Click to expand...
Don't use power tools, all by hand. Have overtightened in past and learn from it. May try to get new housing and see. Thanks for input.


#24

smalltimerpm

smalltimerpm

1967 said:
Don't use power tools, all by hand. Have overtightened in past and learn from it. May try to get new housing and see. Thanks for input.
Click to expand...
Depending on some models there are small metal sleeves installed into the plastic where the element boxes are secured. To over tightened past that you have to be really willing and ready for something to break. Fuel and fire! Main 2 to focus on. Figure out why no fuel on initial start. My guess... Amazon


#25

J

Johner

If not fixed, Some of the carbs need the main jet cleaned with carburetor jetting drill bits. Or check the valve clearance.


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