Billet Bypass Fuel Pressure Regulator 4.5-9psi Adjustable Blue 3/8" NPT Ports

Overview

Aeroflow Billet Bypass Fuel Pressure Regulator for carburettor applications, adjustable from 4.5 to 9 PSI, finished in blue with 3/8" NPT ports. This billet aluminium regulator is engineered to precisely control fuel pressure from the pump to the carburettor, helping prevent flooding and drivability issues caused by excessive pressure on the needle and seat assembly. In return-line setups, this regulator reduces load on the fuel pump, delivering quieter operation, cooler fuel, and extended pump life. Its robust construction and precise adjustment make it a reliable upgrade for performance carburettor systems that demand consistent pressure across varying engine conditions.

Key benefits

• Fully adjustable 4.5–9 PSI to match your carburettor’s needs
• Billet aluminium construction for durability and consistent performance
• 3/8" NPT ports for secure, universal installation
• Bottom return design suitable for systems with a return line to the tank
• In return-line setups, reduces load on the fuel pump, delivering quieter operation, cooler fuel, and extended pump life
• Maintains stable fuel pressure across a range of operating conditions for reliable performance and smoother throttle response
• Protects needle and seat assemblies from excessive pressure

Finish options

Finish: blue (standard). Additional finishes available include black anodised, red anodised, or polished.

Fuel compatibility & notes

Compatible with pump fuel, E85 alcohol and diesel fuels. Note: Recommended for carburettor fuel pumps only – not EFI.

Specifications

• Overall Length: 70 mm
• Body Height: 59 mm
• Bracket Height: 42 mm
• Overall Width: 38 mm
• Bracket Centre to Centre: 43 mm
• Fittings: 3/8" NPT

Usage and installation

Ideal for carburettor-equipped engines that employ a return line to the tank. The regulator maintains stable fuel pressure across a range of operating conditions, ensuring reliable performance and smoother throttle response while protecting needle and seat assemblies from excessive pressure.