Curious on thoughts about doing doing this? My understanding is this return line is to bleed off air/foamy fuel before it enters
I ran without it connected for a year or so. The difference to me was clear: air intrusion is not a problem with that hose plugged.
The byproduct of this is that if you suck up a bunch of air (like too late switching tanks) then ALL the air goes to the IP. It's high speed and downhill that allow you to keep coasting in gear long enough for the air to work out. Otherwise, no dice and you'll be cracking lines on the side of the road.
I've since deleted my stock fuel header and dont have that return line, now that I'm comfortable with it. The best thing is just to switch tanks a little early than a little late.
Also, I have an E pump which makes a big difference when purging air on the side of the road.