That's the fancy polished one. Just remember it's set low.
The Holley system is red for low, blue for high pressure.
No return line necessary.
See that link on tuning Webers. It turns the tank into a heat sink.
I guess it's ok with a full tank but what happens when there is only a couple of gallons in there and you are shooting "hot" fuel in the tank?
Answer: I don't want to find out.
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