REGULATOR 4-1/2 to 9psi HOLLEY 3/8in

The needle and seat assemblies in most 2 and 4 barrell performance carburetors can only control fuel pressure up to about 7psi. If your fuel pump is putting out more than 7 psi, a regulator should be used to keep the fuel pressure within safe limits and avoid the possibility of flooding. Holley's 4-1/2 to 9psi adjustable fuel pressure regulator has 3/8f npt ports, 1 inlet and 2 outlet, complete with mounting bracket. Can not be used as a return style, use HLY12-803BP