HP Billet Carbureted By Pass Fuel Pressure Regulator

Part # 12-841 Be the first to write a review

Street/Strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI

Estimated Ship Date: 06/19/2026

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Emissions

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.

See Emissions Details

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. They feature a black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks. The Holley 12-841 fuel pressure regulator features 3/8" NPT in/out ports and a 3/8 NPT return port.

Features:

Adjustable from 4.5-9 psi for precise fuel pressure adjustments
Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
Used in systems with a return line back to tank
Use with electric pumps only
One 3/8" NPT inlet, one 3/8" NPT outlet and one 3/8" NPT return (or bypass)
1/8" NPT gauge port
Comparable and interchangeable with popular Holley® 12-803BP regulator
Mounting bracket included

About Holley

Holley Performance Brands is the undisputed leader in carburetors, fuel pumps, fuel injection, intake manifolds, fuel injection, and fuel systems.

Adjustable	Yes
Brand	Holley
Category	Air and Fuel Delivery
Color	Black Anodized
Emission Code	5
Fuel System	Carbureted
Fuel Type	Diesel
	Gasoline
Gauge Included	No
Gauge Port Included	Yes
Grade Type	Performance
Inlet Gender	Female
Inlet Port Diameter	3/8 IN
Inlet Port Quantity	1
Inlet Size	3/8 inch NPT
Inlet Type	NPT
Material	Aluminum
Maximum Pressure	9 PS
Minimum Pressure	4.5 PS
Mounting Bracket Included	Yes
Mounting Type	Inline
Outlet Gender	Female
Outlet Port Diameter	3/8 IN
Outlet Port Quantity	2
Outlet Size	3/8 inch NPT
Outlet Type	NPT
Part Type	Fuel Pressure Regulator
Port Quantity	2
Pressure Range	4.5-9 PSI
Product Type	Fuel Pressure Regulator
Rebuildable	Yes
Return Size	3/8 inch NPT
Style	Bypass
Sub Category	Carburetion
Warranty	Manufacturer's Limited 90 Day Warranty
UPC	090127670460
Part Number	12-841