Perry Mick wrote:

I wrote:

My sump tank is only 1 gallon with two internal fuel pumps that I run
all the time.  I only turn one off when at altitude on cross-country,
otherwise I leave them both on.  I think the fuel heating up is a
non-concern, at least as far as I can tell.  The fuel return is to
the sump tank in my plane.

John Slade wrote:

Perry,
Is you're tank header tank composite? Where is it located?
John Slade, Cozy MKIV #757, progress: http://kgarden.com/cozy
West Palm Beach, FL

John, it is made of steel and I recently moved it from the
"gascolator" position on the firewall to the opposite side
of the firewall, between the firewall and the main gear.
I did this because I had too, the new mount won't work
with the tank where it was.  But I also prefer it out of the
engine compartment.

It is mounted very low so that the selected main drains
to it by gravity, per plans.  The bottom half inch or so
is in the airstream of the big belly naca inlet, so it gets
good cooling.  But steel is a poor conductor if heat.

Tracy is correct, I should have given more detail, my
system may be a problem for someone if they buried
the tank in the cowling somewhere with poor or no
cooling.

--
Perry J. Mick
Duckt N7XR
http://www.ductedfan.com

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