"no separate return line is required because this module returns excess fuel right inside the tank!"
Wonder if there might be any vapor lock or fuel heating issues ? At 65 PSI i wouldn't think vapor lock would be an issue but the heated fuel sitting in the engine bay might cause some other unknown problems ?
Any new Dodge Hemi doesn't have a return line, at least that I am aware of. They PWM the fuel pump to provide adequate pressure at the rail, but the fuel is not in constant circulation.
That said, my car has an external regulator which is very close to the tank and works very similarly. I haven't had any issues.
