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

Billet Bypass Fuel Pressure Regulator for Carburettor Engines

Engineered by Aeroflow, this billet aluminium bypass regulator provides precise fuel pressure from the pump to the carburettor, delivering reliable performance under demanding conditions. Finished in a bold red anodised coating, it combines durability with a race-ready look.

• Finish: Red anodised billet aluminium
• Ports: 3/8" NPT
• Adjustment range: 4.5–9 PSI
• Return configuration: Bottom return
• 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

Why it matters: Excessive fuel pressure can overwhelm a carburettor's needle and seat, causing flooding or erratic performance. By dialing in the correct pressure for your engine, you gain stable idle, sharper throttle response, cooler fuel temperatures, quieter pump operation, and a longer-lasting fuel pump thanks to a reduced workload.

Compatibility and Notes

• Suitable for pump fuel, E85 alcohol and diesel fuels
• Recommended for use with carburettor fuel pumps only — not EFI
• Available with 3/8" NPT or -8ORB female threads on other variants

Ideal applications include classic carburettor builds, hot-rods, and engine setups where precise, adjustable fuel delivery improves idle quality and overall drivability. The bottom-return design supports efficient return-line fuel systems, helping manage fuel temperature and pressure consistency across the system.