Holley 12-803BP Bypass Return Style Fuel Press Regulator 4.5-9 Psi Adjustable

Holley 12-803BP Bypass Return Style Fuel Pressure Regulator

Designed for carburetor systems with a return line back to the fuel tank, the Holley 12-803BP delivers precise, adjustable fuel pressure to match your engine’s needs. This bypass-style regulator ships pre-set for immediate use and can be fine-tuned from 4-1/2 to 9 psi to optimize needle and seat performance and overall drivability.

• Adjustable fuel pressure: 4-1/2 to 9 psi
• Factory preset to 7 psi for quick, guess-free installation
• Ports: 3/8" NPT in, 3/8" NPT out, and 3/8" NPT return (bypass)
• Return-line design reduces fuel pulsations and keeps pump noise lower
• Quieter fuel pump operation
• Polished finish with included mounting bracket
• Designed specifically for carburetor use

Holley regulators monitor and maintain stable pressure from the pump to the carburetor, helping prevent flooding and drivability issues caused by excessive pressure on the needle and seat. Fully adjustable by design, this regulator provides a simple path to dialing in the exact pressure your carbureted engine demands, with factory preset enabling a confident first install.