So...I figure after some advice I received yesterday, putting in a return line into the tanks is not such a bad idea. Even if its capped and never used. It least my options are open. I decided to give this a second thought. I did more research in the evening looking into my options.
So first off is figuring out the shopping list to install the return
line. From my research it seems that 3/8" line is required in both
tanks. Some folks extend the tube into the inner bays to help mitigate
risk of bubbles. Robert Paisley @ EFII indicates they recommend at
minimum 3" from the fuel pickup. In the middle of the round stamped
stiffening feature in the root rib is a good spot - According to his
posts on Vans Airforce.
I dove into the build logs and the forums to get a good idea of what people are doing. I was starting to steer toward the fuel bungs as folks complain about the fittings turning when they are connecting them and breaking the seal on the proseal. This of course can be mitigated by using a bulkhead fitting, or as Robert Paisley @ EFII suggests using their hard mounted fuel bung eliminates this concern.
I emailed EFII according to their email address on the website as I do not see their bungs available through aircraft spruce. It bounced back as the recipient is not found. It's a bad email address.
So, after much thought. I have abandoned the idea of putting the return line into the tanks. The complexity of the extra return line plumbing and fuel selector coupled with the idea of bunching more holes in the tank has caused me to think scenarios through. I'm 100% certain that I will be proceeding with a FI system that will not require it.
As a side note...I am really wanting to figure out blocking the large opening in the rib #2 (this is in the middle of the rib, not the one on the bottom that is covered by the trap door). Looking at the RV7 build logs there does not seem to be much info on it. However there is a lot more info on the RV8 logs as folks with flop tubes are patching this hole.
