The simplest is to plumb the wing tank through the aux side of the
fuel selector valve directly to the gascolator and use a vented cap.
You haven't really given enough detail about how your main and header
tanks are set up and connected. Will you have a fuel pump or is
everything gravity feed?
=20
Ed


Everything gravity feed is the objective. The header tank sits on the =
cockpit floorboard, directly underneath the main fuselage tank. The =
12gal main tank is plumbed directly with fittings to the aft end of this =
cylindrical header and the gascolator is mounted on the foreward end of =
it on the engine side of the firewall. The main tank has a vented filler =
cap, as does the upper wing tank. Presently, I can find no shutoff =
valves installed, but plan to install one when I figure this out.

Thanks,
Monty