Not Ranked
For what it's worth on mine I have the Holley Red electric pump mounted on the frame rail just below the tank. With the electric running I get a steady 5 psi fuel pressure but if I shut it off and run just on the mechanical it drops to 2-3 psi which is too low in my view. I do think the electric pump, when shut off, creates quite a bit of suction side restriction for the mechanical pump. Maybe just on mine and others may have had different experiences.
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