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Carburetor leak from drain pipe


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Max szeged

 
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Carburetor leak from drain pipe

Thu Feb 26, 2009 12:37 am » Post: #1 » Download Post

As i fitted my new jets and was ready to test it, i run into this fuel leak problem.
Turned on the fuel tap and a bunch of fuel came out of the float bowl drain pipe.
At first i thought i forgot to tighten the drain screw but soon find it was not the problem. By blowing air into the drain pipe i find that the drain pipe opens to 2 openings inside the float bowl. One at the bottom of the bowl and one opens on this pointy rode that sticks out on the float bowl.
The drain screw will block the bottom opening from the drain pipe while tighten but the opening on the top of the bronze rode will open no matter if the drain bolt is closed or opened.
So what i think is that the float valves are not right, letting the fuel get into the bowl slowly and overflowing through this bronze rode.
So i checked the float hight it was 13mm which i believe is right but i saw something i would like to share. please have a look at the float valve picture and let me know if i should change the float hight to a greater value for it to push in the spring completly.
Or get new float valves. Thanks for looking at my pictures.

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Andy
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Thu Feb 26, 2009 1:08 am » Post: #2 » Download Post

Pictures don't work...

Please preview posts before clicking submit! It takes all of about 2 seconds to check!
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nxrsr20

 
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Thu Feb 26, 2009 1:27 am » Post: #3 » Download Post

If you have set up your float height correctly and fuel is overflowing out of the drain pipe, then you are not getting a seal between the needle and seat. Check for contamination, and see if your needle and seat mating surfaces are smooth.
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Max szeged

 
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Thu Feb 26, 2009 7:09 am » Post: #4 » Download Post

sorry about the picture, i did preview it and it did show up on my screen.
here is the link for it.
http://www.wretch.cc/album/show.php?i=koakiss&b=1&f=1308828712&p=7
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Dave Ett
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Thu Feb 26, 2009 9:38 am » Post: #5 » Download Post

The spring is there to maintain pressure on the needle when a bumpy road makes the floats bounce up and down.

If the height is set correctly and the needle / seat surfaces are good they should seal. If not, then something is broken - holed float, broken spring, dirt...
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Max szeged

 
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Thu Feb 26, 2009 11:13 am » Post: #6 » Download Post

Thank you. i will take them apart today, and check for the above.
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