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Holley 12-842 Billet Bypass Return Style Fuel Press Regulator 4.5-9 Psi Adj.
$405.90
SKU: 12-842
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Flexible returns
Designed for carbureted street and strip applications, the Holley 12-842 Billet Bypass Return Style Fuel Pressure Regulator delivers precise fuel pressure control with a durable billet build and an idle bleed feature for stable idle performance.
Key features
- Adjustable fuel pressure from 4.5 to 9 psi with idle bleed for precise idle control and steady cruise performance
- Constructed from 6061-T6 billet aluminum with a black anodized base and a clear anodized top for corrosion resistance and a clean, high-end look
- Return-style regulator designed for systems with a return line back to the fuel tank, helping maintain consistent pressure under varying loads
- Port configuration: one 3/8" NPT inlet, one 3/8" NPT outlet, and one 3/8" NPT return (bypass); includes a 1/8" NPT gauge port for easy monitoring
- Comparable and interchangeable with Holley® 12-803BP regulator
- Includes mounting bracket for straightforward installation
Why it matters for your carbureted setup
- Stable idle and mid-range performance thanks to the idle bleed, which helps control idle pressure precisely
- Consistent fuel delivery during high- and low-rpm operation by returning excess fuel to the tank, reducing pulsation and pressure spikes
- Durable, race-proven construction with a visually appealing, corrosion-resistant finish that stays looking good mile after mile
- Flexible monitoring with an optional 1/8" NPT gauge port to keep an eye on pressure under load
Specifications and compatibility
- Regulator type: Billet bypass, return-style fuel pressure regulator
- Pressure range: 4.5–9 psi
- Ports: Inlet 3/8" NPT, Outlet 3/8" NPT, Return 3/8" NPT
- Gauge port: 1/8" NPT
- Material: 6061-T6 billet aluminum with black base and clear top for protection and aesthetics
- Includes mounting bracket