855.444.6872 Contact Us Mon-Sat 10a-6p
DRIVEN BY CARE

Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879

Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879
Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879
$290.99 ea
NEWOUT OF STOCK
Model: 3991319
STANDARD
DELIVERY
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.
Features:
  • 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) 3/8” NPT Inlet; (1) 3/8” NPT Outlet; and (1) 3/8” NPT Return Port
  • 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
  • Compatible with diesel fuel and E85

About Holley Performance Products

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!

Downloads:

Download Name File Size
holleyfuelsystems_chart1.pdf360.32KB
199r10575rev3.pdf603.79KB

Videos:

Specifications:

Color Black
Emission Code 5, 3
Fuel System EFI/Carb
Fuel Type Gasoline
Inlet Size 3/8 inch NPT
Material Aluminum
Outlet Size 3/8 inch NPT
Part Type Fuel Injection Pressure Regulator
Product Type Fuel Pressure Regulator
Return Size 3/8 inch NPT
Style Bypass
Warranty Limited 90 Day

Reviews:

Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:
Comments:

Ask a question about

Holley Adjustable Billet by-Pass Regulator-3/8" NPT 12-879:
Classic Nova 2024