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

"Bass, Jerry" wrote:

I installed two pumps and a single return to the left tank like Tracy
suggested. The pump puts out a great deal of fuel and when I use my right
tank, I have to watch carefully so as not to over flow the left tank.

I for one, would like the new tank valve but I bought his original version
for $165 with two inputs and Off state.

If the dual valve was available then, I would have used it.  I added a prox
switch under his handle to light a LED on the tank gage glass for the tank I
am using, which duplicates the Arrow Handle.

Jerry Bass

 
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