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

FQRANBO 12-804 is an adjustable fuel pressure regulator with an integrated gauge that lets you set and maintain 1–4 PSI for Holley and Edelbrock carbureted engines.

This compact regulator is built to replace or upgrade factory units on single-carburetor setups, offering precise control of pump-to-carburetor fuel pressure. It combines a 3/8" NPT gauge port in a 1-in, 2-out housing, a fine-tuned restrictor orifice, and a durable metal/ABS construction to resist heat, pressure, and corrosion found in engine bays.

How does this regulator improve carburetor performance?

Maintaining correct fuel pressure helps the carburetor meter fuel consistently across throttle range and load conditions. The 12-804's adjustable knob and internal stabilizer let you trim pressure to the sweet spot for your carburetor, reducing flooding or lean spots caused by pump overpressure.

• Adjustable 1–4 PSI range for precise tuning
• 0.220-inch (7/32") restrictor orifice for proper fuel flow
• Integrated gauge port for on-vehicle monitoring and diagnosis

Will it fit my Holley or Edelbrock carburetor installation?

The 12-804 was designed for direct compatibility with many Holley and Edelbrock single-carb setups. Its 3/8" NPT gauge port and the 1-in, 2-out body make plumbing straightforward in most stock and aftermarket fuel lines, though line adapters may be required for some installs.

• Direct-fit compatibility with common Holley and Edelbrock models
• 3/8" NPT gauge port simplifies adding or swapping a pressure gauge
• Compact footprint fits tight engine compartments

What are the installation and adjustment tips I should know?

Install the regulator inline between the fuel pump and carburetor, following fuel-system safety practices. Unscrew the hex socket nut during initial setup so the knob can be adjusted; once pressure is set, re-seat the nut to lock the adjustment and avoid leaks or accidental movement.

• Loosen hexagon socket nut before adjusting pressure
• Set pressure within 1–4 PSI and then secure the nut to prevent leaks
• If pressure reading is unstable, contact the supplier for troubleshooting

How durable and accurate is the gauge and body design?

The regulator uses a metal and ABS mix to withstand high temperatures and corrosive engine environments while minimizing weight. The upgraded gauge scale offers 1 PSI increments for more reliable tuning than coarse 20 PSI scales, helping avoid misadjustment.

• Metal and ABS construction for heat and corrosion resistance
• Precision scale with 1 PSI minimum adjustment increments
• Internal pressure-stabilizing structure for steady readings

Who is this for: The FQRANBO 12-804 is aimed at enthusiasts and mechanics running Holley or Edelbrock carburetors who need a compact, serviceable regulator to fine-tune fuel pressure. It suits street rods, classic cars, hot rods, and track vehicles that run a single-carb setup and require repeatable pressure control for reliable tuning and drivability. If you need easy gauge monitoring, a durable housing, and a regulator designed to be adjustable on-vehicle, this model gives a straightforward, cost-effective upgrade.