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tc1234c(at)roadrunner.com
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 Posted: Mon Apr 23, 2007 5:30 pm Post subject: Fuel dripping down carbureator at idle cutoff |
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Two weeks ago I reported that I had fuel dripping down the carburetor at
idle cutoff. Today I did more testing and the situation got worse. It
happens only at idle when I began to pull the mixture control out. Called
Aero Sport Power and talked to Bart. He immediately said that was a heavy
float problem and promised to Fed Exp a replacement carburetor to me. I am
still puzzled as why a heavy (leaking?) float will cause the fuel to spill
out at idle cutoff. After engine stops, turning on electric fuel pump does
not cause any fuel leak. Before this problem began, I was not able to adjust
the idle mixture to get rpm rise at idle cutoff. Today I was almost not able
to shut down the engine. As I pull the mixture control out, the engine went
up more than 400 rpm! This is after I turned the idle mixture screw all the
way in.
Ted
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T.C. Chang
http://tc1234c.googlepages.com/
RV-9A, Lycoming (ECI) O320-D2A, 160 hp, Carb, Dual Mag, Sensenich FP
GRT dual DU H1, TT DigiFlight II VSGV, 138 Hobbs
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ceengland(at)bellsouth.ne
Guest
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| Posted: Mon Apr 23, 2007 6:09 pm Post subject: Fuel dripping down carbureator at idle cutoff |
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T.C. Chang wrote:
| Quote: |
Two weeks ago I reported that I had fuel dripping down the carburetor at
idle cutoff. Today I did more testing and the situation got worse. It
happens only at idle when I began to pull the mixture control out. Called
Aero Sport Power and talked to Bart. He immediately said that was a heavy
float problem and promised to Fed Exp a replacement carburetor to me. I am
still puzzled as why a heavy (leaking?) float will cause the fuel to spill
out at idle cutoff. After engine stops, turning on electric fuel pump does
not cause any fuel leak. Before this problem began, I was not able to adjust
the idle mixture to get rpm rise at idle cutoff. Today I was almost not able
to shut down the engine. As I pull the mixture control out, the engine went
up more than 400 rpm! This is after I turned the idle mixture screw all the
way in.
Ted
If the float sinks, the bowl will try to over-fill with fuel because the
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float isn't closing the inlet valve when the bowl is full. It could run
ok (but rich) if the float hasn't sunk much, but at idle it would run
very rich. Pulling the mixture would lean back to ideal mixture & rpm
would rise significantly.
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tc1234c(at)roadrunner.com
Guest
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| Posted: Tue Apr 24, 2007 2:57 am Post subject: Fuel dripping down carbureator at idle cutoff |
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Thanks.
------------------------------------------
T.C. Chang
http://tc1234c.googlepages.com/
RV-9A, Lycoming (ECI) O320-D2A, 160 hp, Carb, Dual Mag, Sensenich FP
GRT dual DU H1, TT DigiFlight II VSGV, 138 Hobbs
--
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