My understanding is that the short return is to eliminate fuel heat soak associated with fuel rail return systems. This is also for emissions as the heated fuel needs to expand vapors and need to be stored/consumed. Of course a vacuum referenced fuel pressure is best, but the OEM decided to adjust for this in the ECM to solve the potential smog/emissions problems. My last project I used 100% braided, but now that I have to do it all over I think I am going to go with hard line and short as possible braided at the engine and tank. I have a 4th gen f-body tank in my 91GTA and I am going to re-do it all so I onyl have a few feet of braided, maximum. I will have one for the return and vapor return in all braided and then a short piece for the feed side to a hard rail. Will also mimize the amount of braided that will need replacing on a maintenance schedule.