You see how the braided fabric holds an otherwise broken hose together
rather than having it totally rupture.
Bleed off hose, for some strange reason, has become quite expensive. My
local stealer / dealer wanted $20 for three feet. On-line suppliers are
thebenzbin.com buymbparts.com esparts.com
You asked for fuel return line, ask for bleed off hose - for the
injectors - and they'll know what you need. You will not find this hose
at domestic parts stores, I will soon need some too and have been
mulling as to when to buy some.
I generally replace all the bleed off hose(s) at once to get the mess
over with and done for a few years and I put the terminal plug into the
stub end line before pressing that stub hose onto #5 injector.
Hope this helps.