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How do I stop a gas leak around the bowl on the carb?

I took off the bowl to clean, now it leaks is there some sort of seal between the bowl and the seat

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On my generator the bowl "shaft" that the bowl screws onto was too long so it would not mate properly even with the o-ring rubber gasket. I placed a special fuel resistant gasket sealer on the rubber o-ring to make it thicker and filed down the shaft slightly so the bowl would be able to sit flush against metal when tightened and this prevented the fuel from leaking out of the bowl.

Posted on May 01, 2015

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Typically there is a very thin o ring that fits in a grove on the carb body where the bowl mates up to the body. Make sure that o ring is not damaged or missing.

Posted on May 04, 2015

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1 Answer

I cleaned the bottom bowls of the carb on my 78 650 and the first carb on the right hand side the gas is running out of the bottom nipple.


Hi, Jeremy and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.motorcycleforum.com/59-motorcycle-repair/96188-carb-leaking-gas.html
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1 Answer

Cleaned out jet of carb


Gas leaks out of the TOP of the bowl or at the Jet/bolt?
Some Bowls have a spring loaded Purge, they don't always seal well, is it leaking from that?

Mar 08, 2016 | Garden

2 Answers

How to fix a leaked 400cc Kawasaki carburettor?


Its probably the float sticking in the carb, not shutting off the fuel flow when the bowl fills to the proper level and the leak is really gas flowing out the overflow.

Disassemble the carb and gently clean the needle and seat with Scotch Brite oven pad. Some needles have a rubberized tip and if so, do not attempt to clean with the pad, but inspect it for a worn 'ring' around the perimeter that is failing to seal off the flow of gas into the bowl through the seat. A replacement needle is required if in fact it looks indented.

IF you have already disassembled and cleaned the inside of the carb, you may have jeopardized the intergrity of the bowl gasket. Get some gasket sealant at the local auto parts store and disassemble the carb again. Use a toothpick to run a thin...thin...thin line of Form-a-Gasket sealant around the perimeter of the bowl and GENTLY reassemble the carb. A thin line is a MUST as any excess can be squished inside the carb and possibly block an idle jet of inhibit the action of the float.

Jan 02, 2015 | kawasaki Motorcycles

1 Answer

I have gas leaking out of the bottom of the carbs where the drain plugs are. It only leaks when the bike is moving. Does not leak idling. It idles perfect and runs out perfect no spitting and sputtering or...


Possability the inlet seals on the float bowl are hard or just old and when you ride- the vibration allows too much gas to flow past the inlet seals causing the float bowls to overflow.

How long ago since the Carbs were serviced?.

Aug 19, 2014 | Motorcycles

1 Answer

I have a 1981 yahama 850 midnight special. It has been sitting for 3 years. I tore apart the carbs and cleaned them. After putting everything back together the middle carb is leaking gas out of the two...


Is it poss to remove the float bowl while the carbs are fitted to the bike? I am fairly sure back in the eightys the float was addjustable, to controll the fuel level by bending slightly the metal tab on the float, when the bowl is removed check the level of fuel in the bowl and compare it to that in the others, the aim is to make the fuel flow stop at the correct level in the carb(by bending the float tab) while the bowl is off turn on the fuel push the float all the way up check if the fuel flow stops, also check the condition of the sealing washer around the float needle seating.

Jun 12, 2011 | 1981 Yamaha XJ 650

1 Answer

Took 2002 V-Star Classic 650 out of storage, it


well it sounds like the float needle is not shutting fuel off whin the bowl is full of fuel you can lightly tap on the bowl of carb an that may make it stop what has happend is the bike has sat you may need to run a little fuel treatment through it or sea foam and that may clean the end of the needle off the way it works when the bowl of the carb fills with gas the float raises a needle valve into a brass seat and stops fuel flow into the carb fuel get old and starts to develop a tarnish on that nice pionty valve an then it won't stop gas the overflows just prevent to much into the motor try some fuel treatment and run it it may fix it self just from fresh gas an being driven worst case is having to clean your carbs still not to bad hope that get you fixed up

May 15, 2010 | 2002 Yamaha V Star 1100 Classic

3 Answers

Gas leaking from bottom of carb


Your info is vague; does gasoline leak when engine running or at any time? Does the engine run ok, or is the engine flooding from too rich a gas mixture ?
Most often the leak is the seal on the float bowl; either the top rim gasket or the fiber washer on the center nut/bolt. It also can be from a sticking float that is allowing the gas to continue above the normal level (just like in a toilet tank). This can happen if the float is deteriorated from moisture over the year and gas/water has gotten into the float and making it hevier than normal (thus changing the level at which hte float actually floats and stops the inflow of gas. Also , the needle that the float pushes to stop gas can stick open or closed.
Most of this work can be done without renoving carb from engine but it requires a bit more dexterity to work on it while attached. Goodluck, Macgivor

Oct 24, 2009 | Ariens Garden

2 Answers

I have a sears lawnmower that was flooded recently. I bought a tune up kit and installed it. I changed the gas and oil also. when I poured in the gas it all came out the air filter. What should I check...


carburator float is stuck in the open position allowing fuel to continiously run / drain out the fuel tank into the carb and then overflow into the venturi of the carb into the engine and out the air filter. Bottom line the carb needs to be disassembled cleaned and rebuilt

Sep 20, 2009 | Craftsman Garden

1 Answer

Fuel leaking from bowls on Carb


is the leak coming from the overflow or just the seal around the bowls? if you take the bowls off (turn petrol off first) the floats may be getting caught open?

Jun 06, 2009 | 1978 Suzuki GS 750 E

4 Answers

Gas leak from carb drain hose


I had this same problem on my DRZ-110.
I took apart the carburator to clean everything out, but when i re-assembled it it started to leak gas out of the drain hose. Then i found out that the problem was that one of my gaskets were torn and were letting air in the drain which prevents it from being a vacuum, therefore causing gas to leak out.
I would first check the float & make sure it isnt stuck, then i would check all of the gaskets and make sure they arent torn, & replace the ones that are, even if theyre slightly damaged they can still let in air.
Your carb has to be 100% sealed & vacuumed to prevent any leaks & for it to work fine, so get those gaskets checked out

Jan 07, 2009 | 2003 Suzuki RM 250

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