Holley Chrome Carbureted Fuel Pressure Regulator, 4.5-9 PSI 12-803

Item #21522

Holley Chrome Carbureted Fuel Pressure Regulator, 4.5-9 PSI 12-803
Street/Strip Carbureted Applications
Two Port
Adjustable from 4.5 to 9 PSI
- +
Quantity: close


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. The Holley 12-803 fuel pressure regulator features 3/8" NPT in/out ports.


  • Adjustable fuel regulation from 4-1/2 to 9 psi
  • .220" (7/32") restriction
  • 3/8" NPT ports ( 1 in, 2 out)
  • Chrome finish
  • Mounting bracket included


(1)Holley Chrome Carbureted Fuel Pressure Regulator, 4.5-9 PSI 12-803


Brand: Holley
Color: Silver
Emission Code: 5
Fuel System: Gasoline
Inlet Size: 3/8 inch NPT
Material: Aluminum
Outlet Size: 3/8 inch NPT
Pressure Range: 4.5-9 PSI
Product Type: Fuel Pump
Style: Non-Return
Part Number: 12-803


This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.


Instructions for Part# 12-803

Holley Fuel Systems Chart

*** If you are using a mechanical fuel pump, use the 12-803 regulator. ***If you are using an electric pump with a return line in the system, use the 12-803BP.


1 Year Manufacturers Warranty

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