Holley Fuel Pressure Regulator # 12-803
4.5-9 psi Return-Less Gasoline Aluminum

Regulator Pressure Range: 4.5 to 9 PSI
Regulator Style: Return-Less
Compatible Fuels: Gasoline
Rebuildable: Yes
Regulator Material: Aluminum
Regulator Spring Chamber Finish: Natural
Number of Inlet Ports: 1
Inlet Port Size: 3/8" NPT Female
Number of Outlet Ports: 2
Outlet Port Size: 3/8" NPT Female
Includes Pressure Port: No
Includes Boost/Vacuum Reference Port: No
Includes Pressure Gauge: No
Includes Fittings: No
Quantity: Sold As Each
  • Adjustable fuel regulation from 4-1/2 to 9 psi
  • Aluminum construction for a 43% weight savings
  • Compatible with GM, Chrysler, and Ford A/T kickdown linkage. Additional parts may be required.
  • Intended for lightweight vehicles w/ manual trans or automatics with high stall & low gearing
  • 100% wet-flow tested by Holley technicians to assure it arrives ready to run!
Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator.