Anderson Ed wrote:

Hi Mike,
        The automatic notice on your header tank fuel level is a good ideal.
However, I think you will find that the header tank will not go dry
unless you exhaust the fuel from the wing tank you are feeding from.
The pressure differential created in the header tank by the fuel
injected will be more than enough to pull fuel out of your wing tanks.

However, should you forget to switch tanks then the warning light should
help prevent heart attacks when you run the tank dry and it gets awful
quite in the cockpit.  Don't ask me how I know{:>}.

Ed Anderson

 
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