I've got brand new 5/8 fuel line running from the tank to my brand new Holley Mechanical fuel pump, up to an Edelbrock 600cfm. I threw a fuel gauge on it and it's reading 9lbs of pressure. Why so high? Should I get a regulator and what would be an optimum pressure to be at?

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1990 GTA
-355 carb'd, nicely reworked '64 vette heads, 2500 stall, 4.10's, other small things.
-Alston SFC's, Eibach Pro-kit, Koni's all around
-100+ nitrous shot
-Cruising in style with leather and nice stereo.

Optimal pressure should be around 5-6 psi. You might need a regulator to help lower it a bit. Are you running rich? Gallons per minute are what you (with the NO2 shot) should be more interested in...

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

Depending on exactly which Holley pump you bought that could be normal. They have street versions (6-8 PSI) and strip versions (7-9 PSI). if you goofed and bought the wrong one you can regulate the pressure down with Holley regulator from Summit: HLY-12-803.