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I have a 1981Suzuki gs550l Fule runs out of the back of the carbs Ive replaced the petcock The needles and seats Adjusted the floats to spec and cleand everything very thurowly and fule still flows right out of the back of all 4 carbs. Any suggestions?

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  • 34 Answers

Float valve seats have o ring seals on some carbs,
check those. Float level must be set correctly
or floats will hit the carb body before needle closes.
Floats must move easily up and down.
Carb body air vent passages must be clear.
---

Posted on Dec 07, 2014

  • Moto-Wiz
    Moto-Wiz Dec 07, 2014

    Make sure the floats float! (No holes in the floats)

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1 Answer

When off gas is leaking


1. remove the hose from the carb and see if the petcock is shutting off the gas and if not clean, repair or replace the petcock.
2. look in the tank and see if it has rust in the tank even a small haze of rust as rust will cause the needle and seat to stick in the carb and make the gas leak. If the gas tank has a lot of rust it may need a tank rubber liner kit added or even a new tank to stop the leaking.
3. if the bike has been sitting for a while it may have trash in the fuel system(carb/petcock/tank). Rust or any trash can cause a leak. Properly clean out the carb and fuel system and add a new filter when done.
4. Improperly adjusted or bad needle/seat or float in the carb will cause continual leaking. Replace the needle/seat/float and adjust the new one when installed. Check your service manual for float adjustments.

Jul 22, 2012 | 2002 Honda CR 125 R

1 Answer

Gas runs out of yhe over flow tube on the carb after it sits nawhile after riding. Harley 883 sportster. 1200cc


You didn't say what year modle bike you have but you probably have more than one problem. The first problem is in the carb. The needle is not seating properly in it's seat in the carb. The needle and seat shuts off the fuel to the float bowl once it's full. Ths could be because of wear or you might have a bit of trash in the needle and seat. The second problem is that since 1996, Harley has been installing vacuum operated fuel petcocks on the bikes. Fuel should be shut off if the bike is not running. Either the petcock has been changed out and a manually operated petcock has been installed or the needle in the petcock is not turning the fuel off. You'll have to remove the petcock from the tank and disassemble it to check the condition of the needle in the petcock. Take the rear plate off the petcock to access the needle and the diaphragm that operates it. Check the diaphragm for holes.

Good Luck
Steve

Jul 17, 2011 | Harley Davidson GT 500 Cafe Racer...

2 Answers

I'm getting gas to the carberator, but not getting gas in the carb.


If you are getting fuel TO the carb but none IN the carb, your float is probably stuck. The float is supposed to lower in the float bowl when the fuel level is too low opening the needle and seat which allows fuel to fill the float bowl. On the original Keihin CV carb that is on your engine this is a very rare occurance. So rare in fact that I would suspect something other than what you have stated. I would check the vacuum operated petcock to make sure that fuel is flowing through it. Disconnect the fuel line at the carb and spin the engine over. If fuel flows freely from the hose, the petcock is working fine. If not, you need to remove the petcock from the tank and replace the vacuum diaphragm in the petcock. If you are getting a full fuel flow, I would suggest the you remove the carb from the engine and go though the carb completely. This is not a job for a beginner. There are particular setting involved in the carb when replacing the float needle that must be set in a certain way. It's best to have an experienced mechanic do this job.

Good Luck
Steve

Jul 08, 2011 | Harley Davidson FXDWG Dyna Wide Glide...

1 Answer

Had a fuel leak at shutoff now fuel running oout overflow tube


You had fuel leak at the petcock and now you've got fuel running out of the carb overflow? Sounds like two separate problems. The fuel leak at the petcock is probably caused by diaphragm in the petcock. In 1996, Harley went to a vacuum operated petcock and they give lots of problems. Usually it leaks because of a hole in the diaphragm. You must take the square plate off the back and take the parts out. Watch carefully how the parts come out. There's a spring, a needle and the diaphragm. Hold the diaphragm up to the light and gently stretch it. If there is a hole in it, replace it.

As for the fuel running out the overflow, you might have trash in the needle and seat. You'll have to take the float bowl off the carb and disconnect the fuel line. Then, carefully slide the pin out that holds the float in the carb. Remove the float and he needle at the same time. Use compressed air and blow any trash out by blowing into the fuel inlet. Gently wipe the end of the needle and reinstall it. It is easier to do this job with the carb off the engine as you can turn the carb upside down to do the work making getting the needle back in much easier. Especially if you've never done this before. It can get tricky.

Good luck
Steve

May 22, 2011 | 2002 Harley Davidson XL Sportster 883

1 Answer

Fuel is flooding the carburators. Needle and seat seem to be working, but i have gas coming out the exhaust. is the fule regulatar bad and Am i building too much fuel pressure. As soon as i turn the key...


Your issue is probably bad fuel petcock diaphragms. The fuel is by passing the float needles and running through the vacuum lines into the intake manifolds.

May 04, 2011 | Yamaha V Star 1100 Silverado Motorcycles

1 Answer

This is for an 1979 Honda CBX. I installed new float needles and seats. Also, I adjusted float levels to factory specs. All carbs are still flooding.


I PRESUME YOU THOROUGLY CLEANED THE FLOAT NEEDLE SEAT?AND INSPECTED THE NEEDLES FOR LIKENESS COMPARED TO THE OLD ONES, SOMETIMES YOU HAVE TO IGNORE THE FACTORY SETTINGS PLACE THE CARBS ON THE BENCH WITH A FUEL SUPPLY CONNECTED AND ADDJUST EACH FLOAT UNTILL THE LEVEL OF FUEL IS BELOW THE OVERFLOW TUBE ALLOWING ENOUGH ROOM FOR THE FLOATS SO THAT THE LEVEL STILL LYES BELOW THE TUBE WHEN FULLY ASSEMBLED, COMPLETE THIS TEST BEFORE FIXING THEM TO THE BIKE, WHEN YOU ARE HAPPY REPLACE THEM BACK ON THE BIKE,

PS IS THE NEEDLE SEAT AVAILIBLE SEPERATLY MAYBE WORTH INVESTING INSOME NEW 1S IF THEY DO

YOU COULD HAVE THE CARBS ULTRASONICALY CLEANED

Feb 27, 2011 | 1979 Honda CBX

1 Answer

When i start the bike cold or hot i have black smoke from the exhaust pipes..choke on or off and cant get bike to idle..i turn off the petcock and after a few seconds the idle starts to come back to...


Black smoke indicates that your mixture is way too rich. Now, you didn't say what carb you're running, stock or aftermarket. But, what it sounds like to me is the needle and seat in the carb is leaking fuel and overfilling the float bowl. When you're running down the road, you'll using enough fuel so that the float bowl does not overfill. When idling, you don't use as much fuel, the bowl overfills, and fuel flows into the carb creating a very rich mixture. Is you overflow hose that connects to the bottom of the float bowl connected, clear and open? If so, turn the petcock on without the engine running. If the overflow is clear and the needle valve is leaking, you should see fuel start to flow out of the overflow hose. This is very important that it do this. If the overflow hose is blocked and you forget to turn your petcock off, you could wind up with a couple of gallons of fuel in your engine. It will leak out of the float bowl, into the carb past the intake valves, past the rings and into the engine. I've also seen it get into the primary drive case as well. I'd put a new needle in the carb and check the float setting according to the book. it's sets with the carb on an angle if the carb is the original Keihin CV.

Good Luck
Steve

Jan 29, 2011 | 2003 Harley Davidson FLSTFI Fat Boy

1 Answer

I have a 2003 harley sportster When I Start it the over flow vent hose flows gas. What do you think the problem is? Thank you Tom


It sounds like your float level is just a bit high in the carburetor. Your bike is equipped with a vacuum operated petcock. When the engine is not running, there is no vacuum on the intake and therefore, not vacuum on the petcock. When there is no vacuum on the petcock, the fuel is turned off.

When you start the engine, vacuum is created and applied to the petcock turning on the fuel. If the float level is set too high or you have a piece of trash in the needle and seat in the carb, the float bowl will overfill and gasoline will run out of the overflow hose.

You need to take the carb off the engine, remove the float bowl, take the float and the needle out and clean out the needle and seat. Then check the float height. Now, this is an area where you need a manual. The float sets with the carb on a 15° to 20°angle. With it on this angle, you set the height to 0.413-0.453" from the carburetor flange surface to the top of the float. I usually try to set the float at the lowest fuel level setting with would be the 0.453" setting.

Good Luck
Steve

Sep 21, 2010 | Harley Davidson XLH Sportster 883...

1 Answer

Leaks gas


the needle and seat in the carb isn't seating. First, shut off the petcock, and drain the fuel bowls with the screw on the bottom of the bowls. Let all the gas drain out of the bowls.Tap lightly on the carb with a small hammer, the refill the carbs, see if it still leaks. if it does, you need to pull the bowls off, remove the float and clean out the needle and seat, and put it back together

Jun 10, 2009 | 1980 Suzuki Gs 550 L

1 Answer

Carb and valve adjustment


Dear Craig,
Presuming that the carb is clean !
It seems that you have either set the float level incorrectly, or allowed the needle to become jammed. The float bowl should a little less than 3/4 full of fuel when the fuel is shut off by the needle and seat.
Check that the needle and seat are working correctly by blowing in the fuel pipe, and then closing the needle by hand. Check that the flow is stopped when the needle is fully raised.
The needle and seat do need to replaced from time to time, but generally last well.
If the needle and seat work, then look at the float level.
Further check to see that the floats are not filling with fuel. If this is the case, then the floats will have to be replaced as most repairs are only temporary.
When the floats are fuel logged the needle will not be raised and fuel flow to the carb will be continuous.

Feb 14, 2009 | 1996 Honda XR 600 R

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