Question about 2001 Suzuki VZ 800 Marauder

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Fuel pouring from front carb vent tube when bike is running, and out exhaust tail pipes. Took carb off to see if float was stuck, which it did not seem to be, cleaned it and reassemble, no succes

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: I bought a 1985 GS 550 LF. It had been sitting

Gas pouring out of the carbs means the float pin are not sealing in thus the over flow.
Go a little down thn .77in , best would be to bench set them.
Take a pipe say from the tank to the feed pipe of the carbs (best would be to remove the tank and place it higher on your work bench to get the gravity flow to the feed pipe of the carbs)
Allow the flow to the carbs and monitor the over flow, see which carbs over flow, remove the float bowl and reset the float and let it go a little less thn .77in, refit the bowl and retry the feed in and recheck..you will come to a point where gas wont over flow, open the bowl and see the level of the gas , it should be covering the jets, but remember that since you will have the float bowl out the gas will show low as when its submersed, the jet stem in the float bowl pushes the gas level up so dont get mixed up when you see the level low , i am sure you will be able to judge it for yourself.
I had the same problem in myYamaha(seca) XJ750R !981and finally managed to win over the problem going over it the way I explained.
Hope this helps! Good luck.

Posted on Jul 14, 2009

  • 636 Answers

SOURCE: Fuel leaking from carb vent tube on newly cleaned carburetor

that would be either the float set to high or the needle and seat is missing an o-ring while you had it apart. Should look at getting a carb kit there only approx. 23 bucks and it would save you a lot of grief in the long run.

Posted on Jul 26, 2009

  • 128 Answers

SOURCE: After cleaning my carbs.. just the bowls and carb

Well, a couple things may be wrong.
1) debris could be lodged under the needle valve. Remove the float by gently slideing the float pin out, the needle will either slide out with the float or remain in the seat and a pair of needle nose pliers will help to retreave it. clean the seat and inspect the needle valve for damage.
*note that even the smalles debris can keep the needle from seating so take care during reassembly*

2)depending on the type of carb cleaner used, and the exact type of needle valve in your carbs, the needle valves may have been dammaged during the cleaning. Some carb cleaners can "eat" neoprene or rubber components in carbs. It is always best to fully disassemble them before cleaning, if you are not confident in your ability, have a pro do it for you.

The solution for this is to remove the needle valve as above, and inspect the needle and float for damage. **If in doubt replace the needle valve**

Good luck.

Posted on Mar 25, 2010

heimlich
  • 1978 Answers

SOURCE: After cleaning my carbs.. just the bowls and carb

You probably have a stuck float needle or a float needle that missed the hole check the leaking carb again. It could be a piece of dirt on just the one float needle or worst case scenario a sunk float(you have to test them by floating them in a cup of gas.).Note: black plastic/foam style floats are susceptible to saturation sinking when used in ethanol fuel (gasohol). If this happens you have to replace the float.

Posted on May 16, 2010

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1 Answer

2002 Vulcan 1500 Classic has fuel pouring from the overflow tube that leads from the carb and routes down by the battery.


bad needle for the float control
there is a small rubber insert on the needles and over time it dries out and cracks

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1 Answer

Why is fuel in vent tubes on my carbs


Hi, Rick 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 visit the websites below. Good luck and have nice a day.
http://www.thegsresources.com/_forum/showthread.php?94636-Leaking-Gas-from-Carb-Vent-Hose
My bike started pouring gasoline out of the carbs just now
Motorcycle Carburetor Cleaning and Rebuild part 1

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2 Answers

Why is gas pouring from the vent line when I go to start it


You don't say what kind of bike or give any other details so I will go with the obvious stuff first, I am guessing you might not ride it often or let it sit up for awhile. Gas pouring from the vent indicates that a float valve is stuck or the needle valve or seat seal has dried up and has fuel being forced around them as the fuel pump pressurizes the carbs. It is dangerous to run the engine with overflow as you could have a fire so your remedy will require you to pull the carbs to fix the problem.

Sep 11, 2014 | Motorcycles

1 Answer

I justgot a 95 kawasaki 500. i just cleaned the carbs and put in a fuel filter. i put bike back together. there is a black tube running out the back of the bike starting from after the carberatuor an


Its probably the crankcase vent. The carbs have more than likely been pouring gas inside the motor,to the point of overfilling the crankcase oil with gasoline. Drain the oil and change the filter. And while youre draing it,..look inside the carb bodies,and see if gas is still running into the cylinders.If it is,then your float height is not set correctly..(too high)...or the needle valves need to be replaced. (valve that hooks onto the floats).

Sep 25, 2012 | 1995 kawasaki KLE 500

1 Answer

I stored my bike for a few months I ran all the gas out b4 I stored it now when i ride it gas pours out the over flow tubes the one on the bottom and the one on top on the pipe side of carb


It sounds like the needle & seat in the carb float chamber is stuck open. Take out the needle attached to the float and clean and blow the jet out. Replace needle and check when you lift the float if the needle closes. Before you reassemble, attache the fuel pipe and see if the fuel still runs out when you lift the float and the needle closes.

Jul 13, 2012 | 2006 kawasaki KX 250 F

1 Answer

When I start my bike, after 30 seconds fuel backs up in the fuel vent tubes and dumps out on the floor. It backs ups thru the air intake, fills the canister on the end of the vent tube, and over flows...


Float is sticking in one or more carbs. To narrow which one it is, drain each carb seperately,measuring the feul in each carb. The one with the most is the one the float is sticking on. Be sure that the top vent lines are not blocked or colapsed.

Nov 02, 2010 | 2002 Yamaha YZF 600 R thunder cat

2 Answers

When i turn the fuel on to start the bike gas pours out the clear tube that comes from the carb to under the bike some were is this line dis conected or broke or is it something more


it's probably just your overflow from the float. it doesn't connect to anything, it just let the fuel overflow come out when your float level is high. if you turn on the fuel petcock and it starts pouring out, your float needle is sticking. clean the carb and the float needle valve assembly and see what happens.

Dec 30, 2009 | 2003 Yamaha TT-R 125

1 Answer

Fuel pouring out of the Air Vent Tubes from the carbies


If the bike has carbs and not fuel injection then the floats are stuck open. try tapping the side of the fuel bowl with a srew driver handel and it may dislodge it to shut the fuel off. If this does not work then you will need to remove the carbs and repair them.

Oct 04, 2009 | 1995 Honda VFR 400 R NC30

1 Answer

Fuel pouring out of overflow tube


Yes, it sounds EXACTLY like a stuck float. You may be able to fix it yourself depending on how accessable the offending carburetor is. Quite often you can free up a stuck float by setting up a bit of vibration. Give this a try > tap the side of the carb repeatedly using the plasitc end of a screwdriver. You are not looking to hammer the thing to death, just create minor shocks. The shocks / vibration will often free up a stuck float. Please rate this solution and let me know if all went well.

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