>…… and all the homebuilt kit makers that I'm aware of specifically say to never operate the plane with a fuel selector on 'both'.

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Then you have never looked closely at a Velocity.

More specifically, you have never seen my Velocity which was something of a worst case scenario when I started picking it apart and reviewing how it was built and the many failure modes that needed to be corrected before I would fly it.

This system had a feed from both wing tanks to a common sump that had no valve at all. It was plumbed straight to the electric fuel pump and them off to the engine.

It now has a split sump with a left/right/both selector (Andair). The electric boost pump is low enough that “un-porting” should never be an issue.

My purpose as far as offering another viewpoint was spawned by talk of “T” connections between two tanks.

It was a somewhat lengthy and diplomatic way of saying “Bad Idea.”

T Mann