Does 99 durago have fuel return line?

 

Nope

 

weird, I thought all FI systems utilized a return line. hmm weird

 

No Dodge fuel system has used a fuel return line since about 1992, Mitsu used it until about 1996 I think. The fuel pressure regulator is mounted to the tank/pump and only sends to the engine what it needs thus eliminating the need for a fuel return line.