Nathan, in one simple word...YES. Webers carbs in general don't like any higher fuel pressure than 3.5psi but 3.0psi is more normal. I hope this helps.
Phil

By nathan blackmon (216.228.164.6) on Monday, November 08, 2004 - 11:10 am:

i have a single weber carb and a elet. fule pump holley red do i need a regulator??? thanx