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Flop tube question

Marl

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Guys---


I'm getting ready to re-do the fuel system on my Starduster Too rebuild.
It has the Starduster aerobatic tank that has a built in header tank below the regular tank----self fills at all times, but when inverted holds about 4 gallons of fuel "above" the main tank (I think the Skybolt has the same arrangement).


My question----the flop tube insertion point is on the aft face of the "header". Do I need to have 2 fuel outlets? One thru the flop tube and a 2nd in the bottom of the tank? How much fuel can I expect to be unuseabe?


I've got a low point outlet for a fuel drain---would be very easy to "T" it and put a secondary fuel outlet in it.
 

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