Carb leaking gas from float bowl drain

My carb is leaking gas from the float bowl drain whenever I have the gas turned on. It's like a constant flow of gas out the bottom of the float bowl. I took the carb out, took it apart, and cleaned everything. I put it back in and still am having the issue. What is causing this? Any help is appreciated!

-Blake

Is the allen on the drain tight?

If it's leaking from the hose end, then it sounds like you've either 1) too high a 'float level', or 2) a float valve that's not sealing;1)...reset float level lower, to test this idea; 2) float valves CAN fail, either in the tip OR the spring-loaded end; probably easier to just change this out...'old school' shops may have an old, pressure tester (common in snowmobile shops), which you could try...but it's faster/cheaper to just throw a new part in there.
I'm not sure what bike/carb you've got, but if it's vintage...I might suspect the older, metal type float itself for internal leakage...test on the bench; newer, plastic types seem VERY reliable.

Thanks guys. I have a 07 TE 450. roost, what do you mean by float level, and how can I reset it lower? This is float bowl drain on the bottom of the carb.

I have had this problem a few times and it was always the float sticking. Usually happens after sitting for a while. When you take it apart make sure the float is actually moving up and down and sealing when up.

yep- many times if the bowl was empty or drained the float will get hung up or a piece of dirt is hanging up the float valve- usually if I tap the side of the float bowl a few times it fixes the issue- sharp taps but nothing that will crack the aluminum- do it when you are in a "calm yet assertive mood" ala Caesar Millan- dog weesperer

That drain (bottom of carb) is attached to a brass tube, in the float bowl, which allows 'excessively high' levels of fuel to drain away, keeping the carb from overflowing into the engine...the float itself has a metal tang, which bears upon the 'spring tip' of the float valve-you can bend this tang, 'VERY SLIGHTLY', to effect a small change, to raise or lower the fuel level, in the float bowl. This is more of a common issue with two-stoke carbs (keihin PWK) than with your FCR...I would look first for 'debris', holding the float valve slighly off its seat, as Motosportz suggests...much more likely with the FCR carb.

You know, I am still battling with this problem. I took apart the cab and took the floats out. I then shoved the shutoff needle in and held it with my finger, and blew into the line, and although it slows the flow, I can still get gas and air through. I have cleaned it out and made sure there is nothing in there to keep the valve open, but it still won't seal properly. Do I just need a new needle?

Thanks,
Blake

http://www.sudco.com/vol33/106.pdf

#36 & 42?

If the float needle is ok and you have the float level set. Replace no. 37 in this diagram http://www.sudco.com/fcrmx.html I have replace these after bikes are stored for the winter they dry up.

So I have finally decided to fix this issue. I am tired of forgetting to shut off my gas and it leaking out. I think to solve this once and for all, I should get #36, #37, and #42 off this: http://www.sudco.com/fcrmx.html

The problem I am having is that the valve seat comes in: 3.2, 3.4, 3.6, 3.8 and 4.0. What is this? What should I get?

Thanks!

-Blake

Ya, all I found in there was that it is number code: 8000 98272 and the name is "Valve Seat". It doesn't tell me what the difference between them is.

Thanks,

-Blake

# should be on the part. That is how much volume it will flow. Later George

I had a similar problem in my '07 TE 250. It was the o-ring around the valve seat. Ordered a new one and it's fine, now. Of course, Sudco had a $30 minimum order or somesuch, so I had to get a pilot adjuster screw. Needed one, anyway.

Thanks George! I will pull it off and take a look at it tonight. I will let you all know what I end up ordering.

-Blake