Holley- 12-880 Carb/EFI Adjustable Billet By-Pass Regulator-6AN


  • $186.95
    Unit price per 
  • Save $13.05

Only 42 left!

Carb/EFI adjustable billet by-pass return style fuel pressure regulator 6AN Boost Reference - 1:1

Holley Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley. They are precision machined from 6061-T6 billet aluminum for strength and durability. These regulators are adjustable from 4-65 psi and will handle both carbureted and EFI applications. A second pressure spring is included allowing you to increase the fuel pressure range up to 65 psi for EFI systems. They are offered with two port sizes, 3/8" NPT or 6AN to adapt to your new or existing fuel lines. So, if you are currently running a carbureted system but plan to upgrade to EFI in the future, these regulators will have you covered either way.


  • Carb/EFI adjustable from 4-65 psi for precise fuel pressure adjustments
  • Constructed of billet aluminum with a black anodized base and a clear anodized top for good looks
  • Used in systems with a return line back to the tank
  • (1) 6AN O-ring Inlet; (1) 6AN O-ring Outlet; and (1) 6AN O-ring return
  • Includes fitting for manifold reference
  • Includes an 1/8 NPT gauge port
  • Boost Reference - 1:1
  • The 4-15 psi carbureted spring comes installed in the regulator
Brand Holley
Color Black
Emission Code 3
Fuel System EFI/Carb
Fuel Type Gasoline
Inlet Size 6 AN O-Ring
Material Aluminum
Outlet Size 6 AN O-Ring
Product Type Fuel Pressure Regulator
Return Size 6 AN O-Ring
Style Bypass
Warranty Limited 90 Day
UPC 090127734988
Part Number 12-880

We Also Recommend