Question about 1980 Suzuki Gs 550 L

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Still workin on my 1980 suzuki GS550 L. Inline 4 cylinder. My Problem is When I run the bike I have gas coming out of my overflow tube for the number 1 and number 2 carburetors but if I disconnect the vacume line to my pitcock it stops leaking. When I reconnect the vacume line it starts leaking gas again. it's a clear vacuum line and it's not sucking gas because I see its dry when running the bike. I have rebuilt the carburetors already. But I didn't replace my float needles or my floats yet. Any help would be very appreciative thanks in advance and Ride safe.

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Hi, Davescheier6 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 blue links below. Good luck and have a wonderful day.
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Carbs leaking Here is how to fix it
Suzuki GS550 Service Manual
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Suzuki GS500 Owner Manual

Posted on Apr 23, 2017


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Posted on Jan 02, 2017

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SOURCE: hello

gas leaking out of the overflow tube is definately a float or float tang problem. if you are sure the tang on the float is adjusted probably, then the float may have a hole in it and it is no longer "floating" to shut off the supply of fuel. i'd remove it and submerge it in gas for a bit and look for air bubbles escaping and also see if it no longer floats after you release it from being submerged. if either happens, then replace the float.

running rich is an improperly adjusted air screw, wrong setting on the jet needle (long needle attached to the carb slide with a circlip), clogged airfilter or wrong jet (main or pilot) size. i'd try to find out the settings for these items and adjust accordingly.

hope you get it all sorted out and get this classic back on the road!

Posted on Mar 07, 2009

  • 1 Answer

SOURCE: Rear Carb leaks fuel out of overflow

Hole in the float. It fills with gas, sinks and fails to stop the fuel flow

Posted on Apr 25, 2009

  • 6966 Answers

SOURCE: I have a 1980 GS L 450 Suzuki that starts but

Hi and welcome to FixYa,

Almost always, your described problem would be the float needle not closing the inlet seat. This could be caused by a dirt, sand, contaminant, worn needle ends, grooves on the seat. Unfortunately, the only fix would be to pull down the carbs again and redo. Considerations are:

  • ensure the pointed end of the float needle are not nicked, worn, necked, scratch;
  • ensure that the inlet seat are perfectly round and smooth. You may need a very very fine abrasive material and a Q-tip or cotton buds and do a bit of lapping ( almost similar to valve grinding);
  • ensure the float height is correctly adjusted;
  • verify float is not punctured with fuel sloshing inside.

Good luck and thank you for using FixYa.

Posted on Apr 28, 2009

  • 15 Answers

SOURCE: Float setting for BS34ss carb

I have a set my float to 22.0 +- 1.0 for a Mikuni carb.
To set floats, drain the carbs, pull the carbs from the bike invert and remove float bowl.
With the carb inverted, take off the float bowls. Take off the gasket. Use a vernier caliper or an accurate device to measure from the carb body to the top of the float block.
Here is are a couple of good sites about carbs and such.

Posted on Aug 18, 2009

  • 3600 Answers

SOURCE: float height 1996 gsx r750T. Where exactly on the

you put it on the float base and allow the float to drop down and read the gauge where the float is read the top of the oppiste side where the float is hinged.

Posted on Aug 23, 2009

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Hello. We are working on a 1980 gs550 that we found in a garage. We cleaned and tune up the bike, to find this particular issue. Once started, gas began to leak from one of the exhausts and cylinder...

Make certain the vacumn fuel tap is working correctly, do not run it on pri. only use on or res
s uck on the vac tube to the tap to check it turns on, if you get a mouthful of fuel the diaphram is shagged

Not sure what you meant by valve repair?

Jun 06, 2011 | 1980 Suzuki Gs 550 L

1 Answer

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Where exactly is it coming from. Easiest way is to clean up the bottom and try and follow it up. The carbs have hoses that gas will leak from if there is a problem with them. A stuck float valve will cause your overflow tube to drip gas when the petcock is on. Also, if your gas tank is overfilled or on a hot day, sometimes gas can come out of that overflow tube as well. Figure out exactly where it's coming from first. Or take a picture, that will help. If it is the carb overflow tube give the carbs a good whack with a plastic handled screwdriver (a big one) and that may release the stuck valve and allow it to do its job, which is closing off fuel. Other than that, the only other cylindrical thing I can think of would be the brake master cylinder, which would also drip a clear-ish liquid, that resembles gas, but doesn't evaporate at all. It is essentially hydraulic fluid. I hope this helps.


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When I turn on the petcock on the bike a steady flow of fuel comes out of the overflow tube. When I turn it off the bike starts and runs fine. I let it run for 15 min before it stopped with the fuel turned...

You have rust in your gas tank causing the needles to stick open. Check the filter on your fuel petcock or add an additional inline filter. Or you have worn needles in the carburetor. Disassemble clean and replace. You possibly have a malfunctioning vacuum fuel petcock that is bleeding fuel past vacuum diaphragm. Rebuild the vacuum petcock with a K&L rebuild kit or replace it with a new petcock that will also have a new fuel filter on it.

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Bike won't stay running without the choke out.

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Mar 28, 2009 | 1980 Suzuki Gs 550 L

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