Fuel Tank – Fuel return line

So I’m making progress on building the fuel tank (forgot how enjoyable it was to make progress!) and just about at the point where I’m ready to fully disassemble / deburr / dimple.  Per my previous post, I was able to adjust the skins for the locking fuel caps and now I’m at the point where I’m trying to figure out how to fabricate a fuel return line.

So I’m not an engineer or true engine monkey, however in the research I have been doing, if I decide to go with one of the EFII solutions (either FlyEFII or SDS), then I’ll also need to have a way to return fuel to the aircraft tank.  Basically their designs will return any excess fuel back to the tank.  This requires not only a fuel return port / line, but also a duplex fuel selector valve so when you pull fuel from the right tank, it returns excess fuel to the right tank.  Plenty of discussion on VAF for those that want to know more and I’ll possibly get into it more later in the build.  For now however I would rather add the port before the tank is sealed vs trying to do it as an afterthought later.

Currently my thought is to add a second VA-141 fuel flange to the inboard aft rib.  It’s not obvious but based on experiences from other via VAF, you don’t want to do this in the area shaded in RED.  My plan is to add it to one of the areas in greed below.[inpost_fancy thumb_width=”200″ thumb_height=”200″ post_id=”695″ thumb_margin_left=”0″ thumb_margin_bottom=”0″ thumb_border_radius=”2″ thumb_shadow=”0 1px 4px rgba(0, 0, 0, 0.2)” id=”” random=”0″ group=”0″ border=”” show_in_popup=”0″ album_cover=”” album_cover_width=”200″ album_cover_height=”200″ popup_width=”800″ popup_max_height=”600″ popup_title=”Gallery” type=”fancy” sc_id=”sc1539183671197″]

I have some AN fittings as well as the VA-141 flanges on order to do some test fittings to make sure this will work as well as a message on the VAF to make sure I’m not missing anything.  Hopefully everything arrives by Friday so I can possibly start the “dreaded” proseal process this weekend?  Currently have 2 tubes of proseal on order that also hopefully arrives. I think i’m going to stick with the pre-measured stuff that you mix in the tube based on some posts about proseal de-curing currently being discussed?!?!

Update:  Looks like using a second VA-141 fuel flange from VANS, as well as a AN816-6-6D Nipple should do the trick.  Honestly this appears to be similar to the Bung that EFII is selling, just internally mounted vs externally mounted?