FQRANBO Adjustable Fuel Pressure Regulator for Holley/Edelbrock 1–4 PSI with Gauge, 3/8" NPT, 1-in 2-out

The FQRANBO 12-804 is an adjustable fuel pressure regulator with an integrated gauge that stabilizes and lets you precisely set carburetor fuel pressure between 1 and 4 PSI for Holley and Edelbrock systems.

If your carbureted engine needs consistent, tunable fuel delivery, this compact regulator gives you a direct-fit option for many Holley and Edelbrock carburetors. Built from metal and ABS components and featuring a 3/8" NPT gauge port and a 0.220-inch restrictor orifice, it simplifies monitoring and helps prevent pressure swings that upset drivability.

How will this regulator affect my engine's performance?

The 12-804 provides a stable fuel pressure reference between the pump and carburetor, which helps the carb jets work as designed. By keeping pressure within a narrow range, the carburetor metering stays consistent across load and RPM changes, improving throttle response and reducing hesitation.

• Adjustable range focused on 1–4 PSI for fine-tuning carburetor operation
• 0.220" (7/32") restrictor orifice to control flow characteristics
• Internal stabilizing mechanism to minimize pressure spikes
• Gauge port for live visual verification of set pressure

Is it easy to install and check pressure?

Yes—this regulator is designed to mount as a one-inch inlet with two outlets (1 in, 2 out) and a 3/8" NPT gauge port for quick hookup and verification. Installation requires loosening the hex socket nut for initial adjustment, then re-securing it once you confirm the desired pressure to prevent leaks or over-travel of the adjustment.

• Direct-fit compatibility with Holley and Edelbrock carburetors
• 3/8" NPT gauge port accepts common pressure gauges
• Instruction to unscrew hex nut for adjustment, then tighten appropriately
• Compact footprint fits typical engine bays without major modification

What materials and durability features does it include?

The regulator uses a combination of corrosion-resistant metal and durable ABS so it tolerates high temperatures and the harsher conditions found near the engine. Its construction is intended to resist rust and maintain mechanical integrity under repeated pressure cycles.

• Metal body for structural strength and heat resistance
• ABS components where lightweight, impact-resistant parts are needed
• Seals and internal parts designed for fuel exposure and pressure endurance
• Manufacturing aimed to reduce the chance of leakage when installed correctly

How accurate is the gauge and how should I troubleshoot readings?

The upgraded gauge scale provides 1 PSI increments for clearer tuning than coarse 20 PSI markings, making small adjustments easier to read. If you notice erratic readings or display anomalies, first verify fittings and mounting; contact support if instability persists.

• Improved minimum scale of 1 PSI for precise adjustments
• Use the 3/8" NPT port to attach a compatible gauge for live feedback
• Check that the hex socket nut is properly set to allow adjustment without leak
• Reach out to the manufacturer for guidance on unusual pressure behavior

Who is this for? The FQRANBO 12-804 is aimed at owners and mechanics of carbureted vehicles who want a reliable, adjustable regulator to tune fuel pressure for Holley and Edelbrock carburetors. It suits street rods, classic cars, hot rods and any build where precise carburetor fuel pressure improves drivability. If you need a compact, durable regulator with a readable gauge and a focus on 1–4 PSI fine-tuning, this unit is a practical aftermarket choice.