Since Paul was able to duplicate the
problem with the Facet in the line and the 3/16 od vent line installed, and was
NOT able to duplicate the problem when he removed the Facet from the system, I
would interpret that (1) The vent line is not large enough to vent in that
particular situation and (2) The Facet pump is not necessary and perhaps even
in the way.
Paul, I know you will stay with it until
you feel comfortable, but if you leave the pump in the system (a proven
problem), I would like to see you go to at least a 3/8 od vent line.
Herb
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Bartrim, Todd
Sent: Wednesday, February 23, 2005
5:30 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Vapor
Lock
Hi Paul;
I'd
suggest that now that you have the vent tube, you really aren't concerned
whether the Facet pump will allow backflow. As a matter of fact I 'd even
suggest that I wouldn't want it, but I'd certainly want the ability to pump it forward
to force cool fuel into the header tank, thereby forcing any possible vapour
back through the vent line. I don't have any problems drawing fuel through my
Facet pumps and I wouldn't be without them.
Just my 2 bits
Todd
Thanks for the info, Tracy. My only
concern is this....if the Facet pump was not involved, might it be better to
have it back in the system so that if I have a future problem, I
could turn the Facet pump on to pressurize the sump tank with fresh fuel?
Ed seems to be comfortable with this, and has had to use it.