return line needed or not.

[COOCHaDAMus]

i changed out my fuel delivery awhile ago from stock hitachi carb to dual weber side drafts. i blocked off my return line back to gas tank. is that line even needed or not? i haven't had anything go wrong runs like a peach just curious. 

[ggzilla]

No carb needs the fuel line.

 

* be sure the vent line is not blocked

* some carbs will overflow without a return line This indicates that either the fuel.pressure is out of spec, or that the carb's inlet needle & seat needs replacement. Hitachis are rated for 3.8 psi, Weber's for 3.5 psi, but both usually work OK at up to 5 psi.

[MicroMachinery]

I'd use it. If nothing else, it keeps the fuel cool and prevents vapor lock.

[COOCHaDAMus]

thank you's GGzilla & MicroMachinery for your teachings of the forc.............naw i'm not gonna say it.

[datzenmike]

The return line is strong with this one.

[DanielC]

If it really was not needed, Nissan would not have put it there in the first place.

[ggzilla]

Same for EGR, spark delay, etc. If the 510 didn't really need spark retard, Nissan would not have put it there.

 

Or - could it be: When something has a purpose, a usefulness, it doesn't mean it is required?