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Thanks for the input guys. This thing holds pressure 'til next Tuesday.
No holes in the feed line either internally or otherwise.As far as foaming
goes, the tank being on the outside makes it very easy to see the foam
forming, and foam it does. It develops a head on it like a mug of beer
which appears to be assisted in it's initiation by the blast of pressure
jetting from the pressure line. As soon as the rpm is reduced the foam
disappears in approximately 1&1/2 seconds and the surface of the reservoir
is clear of any froth. It will run fine on the ground even with a 1/2"
head of foam on the fuel. Idle is good and transition appears to be clean.
I'm beginning to suspect that the pressure to the tank is too high so I
will experiment with cutting it back by turning in the regulator.Right
now it's flush. I also stuck a piece of foam under the tank, but it did
not appear to diminish the foaming action.I think if I could see thru my
canopy on my full size bird, I would be willing to bet that there is an
equal amount of foaming.I also don't have a lot of faith in that blue tubing
that YS uses as intake line to the carb as I just had a split develop in
one of the lines on my L so I may just replace that too.
<br>Thanks for all the great advice.
<br>Georgie
<p>EHaury@aol.com wrote:
<blockquote TYPE=CITE><font face="Arial"><font size=-1>Georgie</font></font>
<p><font face="Arial"><font size=-1>Although it seems highly unlikely with
a pressurized fuel system, I've seen a couple of examples of similar performance
with unpressurized systems that turned out to be fuel foaming. Seems that
when held on the ground things were damped enough to prevent the foaming,
but in the air the system was free to resonate. Just maybe a solid mounted
engine on a profile fuse can foam even a pressurized system.</font></font>
<p><font face="Arial"><font size=-1>Earl</font></font></blockquote>
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