May I run this without a return line to the fuel tank?

Yes but you would have to plug the return outlet. Make sure to use fuel friendly thread sealer. Or you can buy the Holley 12-803 regulator that comes without a return line and is a cheaper option than this. Cheers

What is the maximum flow rate through this unit?

6 psi is the highest. I’ve got mine set at 2.7 psi as it’s used on an old Ford Flathead engine and Carb.

Does it come with instructions

Yes, the Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome comes with instructions. The instructions are available in the product packaging or can be downloaded from the Holley website. The instructions include information on how to install the regulator, adjust the pressure, and troubleshoot any problems.

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Holley Bypass Regulator, Fuel Pressure 6.0 Psi, Chrome

Product ID: 495149039

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📏Precise 6.0 PSI fuel pressure regulation

🔩3/8” NPT ports for seamless vehicle-specific fit

⚙️Die-cast aluminum build for ultimate durability

Description

⛽️ Regulate your ride with precision and style — don’t get left behind!

BOOST READY DESIGN - Includes 1/8” NPT boost reference port for 1:1 boost response
SLEEK CHROME FINISH - Machined exterior adds a premium, polished look under the hood
RUGGED DIE CAST ALUMINUM - Engineered for long-lasting performance and corrosion resistance
VEHICLE SPECIFIC FITMENT - 3/8” NPT inlet, outlet, and return ports ensure perfect compatibility
PRECISION FUEL PRESSURE CONTROL - Maintains a steady 6.0 PSI for optimal engine efficiency

The Holley Bypass Regulator delivers reliable 6.0 PSI fuel pressure control with durable die-cast aluminum construction and vehicle-specific 3/8” NPT ports. Featuring a boost reference port and a sleek chrome finish, it’s engineered for performance and longevity in any high-demand fuel system.

Specifications

Manufacturer	Holley
Brand	Holley
Model	Holley Bypass Regulator, Fuel Pressure 6.0 Psi
Item model number	HOL 12-881
Exterior	Machined
Manufacturer Part Number	HOL 12-881
OEM Part Number	12-881
Item Weight	227 g

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