Question about 1999 kawasaki EN 500 Vulcan Classic

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Leaking fuel from somewhere other than Carb.

We have small backfire when downshifting and stalling at stops. Now fuel is leaking from somewhere near the aircleaner. I checked a couple of the fuel emission hoses and that's not it.

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One of your carb floats could be sticking and fuel is going into your airbox, with engine running try tapping each carb, with something like a plastic handled scewdriver. but take it easy

Posted on Jun 21, 2009


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Why is there fuel leaking from a small nipple on the side of our 110cc chinese quad

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Sears troubleshooting

Check for leaking intake gaskets or leaking head gasket

Those issues will draw in extra air, that will lean out the fuel mixture
or prevent the proper vacuum from drawing fuel into the cylinders,
thus the lean backfire

Need to get yourself the spark plug tester with the clip attached
& says for small engines,to test for a strong spark

There is one also that says HEI on the plug
That one is for vehicles with electronic ignition
& plug gaps of .043 thru .060,not for small equipment

If you have a carb with a float,take the carb apart & clean it
with carb cleaner,then green brakleen & install a new spark plug

For the gaskets,you pretty much have to take things apart to check them

A tune-up on small equipment also includes changing the head gasket, as odd as that seems

If you hear your neighbors mower popping as they cut the grass,
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When you clean the carbon off a piston & cylinder head you
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Let the engine warm up for a couple of minutes and see if it will run with the choke off. I have a couple of small engines which crank well and won't run cold but do OK after I let them warm up a bit.
Normally I would say you have a carb problem with gas not getting from the carb bowl, into the jet and into the engine.
Your engine being new it could still be a problem.
All the air coming into an engine is supposed to come thru the carb. If you have air leaking in from somewhere else then to get the air/fuel correct enough to run you are having to close the choke.
Check for leaks by cranking the engine and doing a quick spray of carb cleaner all around the mounting areas but not near the air intake.
If there is an air leak the engine will respond by changing rpm.
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I have installed a used carb.,new cap,rotor,plugs,fuel control relay,used dist.The same problem still exists.Under 1000 rpm the vehicle sometimes stalls.It fires back up,sometimes with a backfire and seems...

you blew your head gasket, water leaking into cylinder, when you let the car sit, it cools water seeps into cylinder. you drive it around it warms up, water evaporates, the metal expands due to heat. water stops leaking into cylinder and car feels to run normal again.

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My briggs vanguard v-twin 16hp after initial start up this fall started leaking fuel from the carb into the cyl. and into muffler. The jet is seated and not dirty. It leaks somewhere else in the bowl. ...

The solenoid on the bottom is a fuel shut off solenoid to prevent backfiring if shutting down engine with the throttle still open. If you're leaking fuel into the engine, the float is not closing the needle valve in the carb. remove fuel bowl and replace float, and needle valve with seat.Be sure to blow out all fuel passages

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89 Cutlass Ciera stalls when stopped. plugs have been changed, wires, fuel pump. Any thoughts on what is wrong?

With a good air filter, and a good fuel filter you shouldn't really have any problems since the fuel pump is good. You could have a vacuum leak, this can be identified by using a can of carb. cleaner with the tube attached so that you can spray near & around your vacuum hoses & connections. If you spray near a leaking hose, or a cap, or connection that is leaking, the engine will slow or stall. Only spray a second or two & allow the engine compartment to air out between spraying as it is a flamable product.

Short of that, you could be looking at ta idle speed control motor/throttle position sensor.

Testing the vehicle with a vacuum gauge could assist in identifying any other issues such as exhaust or valves. Gauges usually come with instructions & just need to be hooked to an available intake port.

good luck.

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Leaking gas frm bottom and does not run right

the float may b sticking...depending on what type of carb ur running...the spit and sputter problem sounds like you are running a keean carb and if thats the case...there is a extra setting on those that is leaded in from the factory that your average joe doesnt know about...have someone familiar with this adjust it for you and that will help some ...however if itis a keean either live with it or change carbs...that spit you described is just how they operate

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