Make sure there is no little bur on the barb that may be damaging the new bypass hose as you put it on. Give enough "loop" to the hose so it's not stressed. Bypass hose will be under fuel pump pressure only, even with a totally clogged injector and the hose is made to take that and more.
The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)