Gas tank becoming pressurized???

[C5GTO]

I've ordered up the fittings and tip over valve needed to redo the fuel return line and tank venting. I started the mods to fuel fill pipe to install a 3/8" stainless tube for fuel return. It looks like the return tube can go down to about middle of the tank, so until the tank goes below half full, the return full won't have a chance for further aeration. The tube exit will be onto a sloped/curved surface so even below a half tank it shouldn't have much risk of aeration.

I'll post pictures of the mods so others with CRL Cobras and EFI can potentially benefit.