Hi Paul,

In my glass goose, I plan to have both upper wing tanks draining into
a common header tank under the engine.  The header tank will contain
twin submersible Walbro pumps, with appropriate check valves,
filters, etc., leading to the fuel rail.  Due to space limitations,
this tank can only hold about 3 gallons.

I can route the return fuel directly back into this tank or to the
inboard fuel sending towers in each wing tank. With the latter, I
don't have a good way to assure equal return flow to both wing tanks,
and the rapid flow might disturb the fuel level sensors.

My question is whether the fuel in a 3-gal tank might get too hot
after being continually cycled through the engine?  If that is
likely, I could probably squeeze in a small fuel cooling radiator
prior to returning to the header tank.

Thanks,

Scott Gettings

That is a good question Scott. At high power the return flow is
less. The thing to do is install some way to measure the temperature
in there and let the engine idle. That will be a worse case scenario.

By sending the fuel back to only one of the main tanks you risk a fuel
transfer problem. Airplanes have crashed because of this. They selected
one tank and it ran out of gas much faster than expected.

Paul Lamar

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