All return fuel is directed all the
time to one of the mains.  THe SOP is to always start, taxi, take off
and climb on the "returned to" tank.   After it is burned down a
reasonable amount (you decide), you can switch to any other
tanks that you might have, and will be adding a bit of fuel to the
"returned to" tank.

John Slade wrote:

I suggested that, but someone said the return fuel is coming in at 30+ GPH.
In that case wouldn't you have to get the "return tank" pretty low before
switching to the "non return" tank, then watch the return tank carefully to
be sure you switch back before overflow? Would an overflow warning sensor on
the vent pipe for the return tank would be a good idea.

I'm not at all knowledgeable about fuel injection. Could someone explain the
basics?

1. Does a fuel injection system ALWAYS need a high speed pump and a return?
Why?

2. What is the typical amount of fuel being returned at idle / full
throttle?

Regards, and thanks for the education.
John Slade, Cozy MKIV #757, progress: http://kgarden.com/cozy
West Palm Beach, FL

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