The same situation would apply with a header tank.

Has anybdoy circle over the airport until both tanks were near empty?
Has anybody measured the temperature of the return fuel?

I haven't measured the temp. in my sump tank, but after landing
recently I touched it and it was ambient temperature.  60 degrees F.
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.
--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

Interesting Perry. Thanks.

Paul Lamar

Temperature of the header tank in this scenario is completely determined by
it's ability to dissipate heat to the atmosphere.  If it were well
insulated, the fuel would boil at some point.  REMEMBER!  the devil is in
the details.  Don't generalize about important stuff like fuel systems.

On the ballast resistor, See my previous post on why it runs hotter at high
rpm.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

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