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Engine / fuel problem

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Old 08-30-2010, 06:58 PM
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ES CONTROL
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Default Engine / fuel problem

I have 85 flights on a UCD with 2nd. engine and I am having problems.
The 2 stroke (mounted inverted) will start , run for 5 Min. than lean out like a vent tube is clogged. But if I blow air through , everything is free.
So I try again this time less than 5 Min. I start to open needle valve and continue opening 3 turns till engine dies. (lean)
I burnt out 3 glow plugs so far. I am going to pull tank and replace fuel lines next. Is their any else ?

P. S. A smoke system ( installed 5 flights ago) may be the cause .
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Old 08-30-2010, 07:27 PM
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DMcQuinn
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Default RE: Engine / fuel problem

It certainly sounds like fuel starvation. Try this. Fill the tank. disconnect the line at the carburetor. let it hang a few inches below the bottom of the tank (put an extension on the line if you have to) to start a siphon into a clean container. The entire tank should be siphoned out at a fairly brisk pace (2 or 3 ounces per minute). If the rate of flow slows down or stops then you know you have a tank / plumbing problem.
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Old 08-30-2010, 07:33 PM
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Default RE: Engine / fuel problem

You need to re-do your tank

Also the UCD's are notorious for the tank being too high
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Old 08-30-2010, 07:42 PM
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Good ole Missouri !!   End of Sept. I get 2 weeks of vacation on dads farm in north east Mo.
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Old 08-30-2010, 07:49 PM
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Thanks .  I found 2 cracks and 1 melted spot so far.
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