Part of Holley's complete billet fuel pressure regulator lineup, this regulator is precision machined from 6061-T6 billet aluminum for strength and durability, with a black bright dip anodized body and clear bright dip anodized top for corrosion resistance. It's designed for use with electric pumps only in systems with a return line back to the tank.
Specifications:
- Brand: Holley
- Category: Air and Fuel Delivery
- Color: Black Anodized
- Fuel System: Carbureted
- Material: Aluminum
- Inlet Size: 3/8 in. NPT
- Outlet Size: 3/8 in. NPT
- Return Size: 3/8 in. NPT
- Gauge Port: 1/8 in. NPT
- Pressure Range: 4.5-9 PSI
- Style: Bypass
- Product Type: Fuel Pressure Regulator
- Sub Category: Carburetion
- Warranty: Manufacturer's Limited 90 Day Warranty
- Part Number: 12-841
Compatible with Diesel #1 and Diesel #2 fuel. Comparable and interchangeable with the popular Holley 12-803BP regulator. Mounting bracket included.
FAQ
Can this regulator be used with a mechanical fuel pump?
No, it's designed for use with electric pumps only.
What port sizes does it use?
One 3/8 in. NPT inlet, one 3/8 in. NPT outlet, one 3/8 in. NPT return, plus a 1/8 in. NPT gauge port.
What pressure range is this regulator adjustable across?
It's adjustable from 4.5 to 9 PSI.

