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For automotive applications with a mechanical pump, the MAXIMUM available pressure is limited by the spring that controls the lever which rides on the pump eccentric. Holley's seem to be able to accept 6PSI, sometimes a little more. Webers on the other hand don't like more than about 3.5-4 PSI. Part of this has to do with the fact that Webers use a metal on metal neddle & seat with a float that doeas not have a lot of leverage. Holley's on the other hand utilize a Viton tiped needle & seat with a float capable of exerting more pressure.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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