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02-06-2013 | 01:51 PM

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rcand

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From: coral springs, FL

RE: Problem with UAT tank. how to correctly set up fuel system

Quote:

ORIGINAL: uixkes

Hi all,

I would appreciate some help and advice.

I tested my JetsMunt VT80 for the first time and wow! what a great turbine.

I primed the fuel line and the turbine started without any problems. The turbine was running for a short while until I noticed a lot of air bubbles, so I shut the turbine and let cool down.

I noticed the UAT tank was only half full (or empty

and was not filled up by the main tank.

I don't understand this as I fill the main tank through the UAT tank.
My setup is as follows:

Main tank has a vent tube (exiting through the bottom of fuselage) and a tube to the UAT tank.
UAT tank has a tube to the pump and a filler plus the tube from main tank

When I fill the tank I see that the UAT is filled up to the top and then that main tank gets filled. I have no air in the system.
As I mentioned I started the turbine and the turbine was running until the UAT tank was down to half full and then bubbles appeared (probably that is where the clunk sits)

Maybe I am missing here something stupid but why is the fuel not drawing from the main tank to the UAT? The main tank is filled through that tube.

I hope you understand my problem. Sorry if I can't explain it better.

Any advice and help would be appreciated as usual.

Ulrich

you are sucking air in somewhere, possibly through the tank you call a UAT, which is a trade name for the BVM UAT which this is not, airlines or fittings before this tank or a restriction before this tank that can't keep up with the demand at high power. I friend of mine had your type bubble trap in an airplane that constantly would flame out due to air. Switched to a BVM UAT.

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