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Old 12-06-2009, 05:25 PM   post #1 of 36
Kingwood990
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Default Two piece flo-jet carburetor leaking (16 hp Briggs)

Well, from one problem to the next on the Kingwood 990. Electrical is all good and the engine cranks, but there's a pretty big leak coming from the main carburetor gasket which had just been rebuilt. It looks like it is coming from the side that is next to the air filter. I was thinking to use another gasket so that there would be two since just one isn't doing the trick. Any other ideas besides getting a new carb?

Last edited by Kingwood990; 12-06-2009 at 05:26 PM. Reason: include info
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Old 12-06-2009, 06:03 PM   post #2 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

I buy sheets of gasket material and make a lot of my own. A good auto parts store should have different thicknesses of gasket material. Just trace the old gasket and cut it out. If you don't have the gasket you can sometimes press the part down hard and make an imprint. Grease on the old part will leave the outline if that works better.
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Old 12-06-2009, 06:50 PM   post #3 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

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I buy sheets of gasket material and make a lot of my own. A good auto parts store should have different thicknesses of gasket material. Just trace the old gasket and cut it out. If you don't have the gasket you can sometimes press the part down hard and make an imprint. Grease on the old part will leave the outline if that works better.
Is it common for these carburetors to leak at the main gasket, even with a new one? I like the idea of making a gasket.
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Old 12-06-2009, 07:02 PM   post #4 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

I took mine apart, cleaned it , and put it back together. I either used the old gasket or made a new one, don't remember. I had no leaking issue, just dirty and running poorly. Mine does drip gas out the bottom hole if I don't shut the gas off and that's it.
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Old 12-06-2009, 07:38 PM   post #5 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

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I took mine apart, cleaned it , and put it back together. I either used the old gasket or made a new one, don't remember. I had no leaking issue, just dirty and running poorly. Mine does drip gas out the bottom hole if I don't shut the gas off and that's it.
What kind of gasket material would be good to use for this application? I know there are different types of materials for different jobs.
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Old 12-06-2009, 10:34 PM   post #6 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

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What kind of gasket material would be good to use for this application? I know there are different types of materials for different jobs.
I am thinking of using Permatex Form A Gasket with the rebuild gasket. Anyone have any success using this stuff? I think it is compatible with gasoline...I hope.
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Old 12-07-2009, 06:09 AM   post #7 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

The material I use is gray in color and comes in a roll. I checked the shop area and everything I have is out of the package. I'm sure the package says what you can use it for and if it's compatible with petroleum products. The people behind the counter should be able to help you out in locating what you need if you can't find it.

I haven't used Permatex Form A Gasket, but have know those that do. If they make it for petroleum products it might work good. I've looked at it at the store and the seam to have a lot of different types for different uses.

Good luck with the carb leak...
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Old 12-07-2009, 09:40 AM   post #8 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

i also try to use a inline gas shutoff on my cast iron briggs engines because the updraft carbs seem to like to leak.i just shut it off when im not using it.
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Old 12-08-2009, 12:18 PM   post #9 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

Well, we tried to take the lower part of the carburetor off with the upper part still attached to the intake and we managed to kind of, no REALLY, REALLY mess up the carburetor nozzle. Can this be reused?



Yea, we tore it up pretty good, stripped the head, broke the nozzle and 40 minutes, 72 cuss words and six tools later were able to extract the "new" nozzle out from our recent carburetor rebuild. Good thing we kept the old nozzle! I slapped some Permatex on each mating surface for the main carb gasket, assembled, tightened and reattached to the fuel line. Upon opening the fuel valve we did not see any gas leak from the main gasket, just out of the bottom hole as Mich 990 had mentioned. We might get this thing running...someday.

Next time rather then trying to save time, we will remove the carb before trying to take it apart. Now on to throttle issues. I think I'll start a new thread for this one.

Last edited by Kingwood990; 12-08-2009 at 12:43 PM. Reason: add info
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Old 12-08-2009, 12:40 PM   post #10 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

Well,you live and learn--always remove the nozzle before trying to remove bottom--I've seen a few removed on the smaller ones,without removing nozzle,but not many.Just get a sheet of gasket material like suggested.Old trick was to use the peen end of hammer and tap lightly for a imprint,I said lightly.You wont have any tro.
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Old 12-08-2009, 12:59 PM   post #11 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

Getting the carburetor mounted and everything attached has been a real pain. Especially that black tube that goes from the neck of the carb to the engine. What does that tube do anyway? I really wish there was an easier way to attach it.
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Old 12-08-2009, 04:47 PM   post #12 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

Does this help? this is what I did to stop the leak .


Spring hookup.

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Old 12-08-2009, 05:37 PM   post #13 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

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Does this help? this is what I did to stop the leak .


Spring hookup.

Thanks, that looks quite useful if this bottom hole leak becomes unmanageable. What the heck if the hole good for if it just leaks?
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Old 12-08-2009, 05:47 PM   post #14 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

The emulsion tube that you broke in half is a major culprit of fuel leaking out of the bottom at the drip hole. Where the tube seats, they notoriously leak. Not enough to affect running at all, but leak while shut off. The in-line shutoff takes care of that. Yours leaking up high sounds more like the float needle isn't shutting off the fuel. Be sure all is set to spec with float/needle.
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Old 12-08-2009, 05:56 PM   post #15 of 36
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Default Re: Two piece flo-jet carburetor leaking (16 hp Briggs)

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The emulsion tube that you broke in half is a major culprit of fuel leaking out of the bottom at the drip hole. Where the tube seats, they notoriously leak. Not enough to affect running at all, but leak while shut off. The in-line shutoff takes care of that. Yours leaking up high sounds more like the float needle isn't shutting off the fuel. Be sure all is set to spec with float/needle.
We'll have to check that out. We really did not mess with the float other then removing and reinstalling, so that is a good point. I have seen how you want it to measure the same from side to side and that you can adjust the tang, something or other. We really should have paid more attention to that.
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