PTNHZ RACING Manual Adjustable Fuel Pressure Regulator — Chrome 1–5 psi Inline for Carburettors

PTNHZ RACING Manual Adjustable Fuel Pressure Regulator is a chrome-finish inline regulator that gives precise 1–5 psi control for single or twin carburetor setups and works with low-pressure electric or mechanical fuel pumps.

If you run carburetors and need stable low fuel pressure to prevent flooding, inconsistent idle or poor throttle response, this compact regulator is built specifically for that role. The top-mounted numbered dial lets you fine-tune pressure from 1 to 5 psi, while a maximum input limit of 7 psi protects the unit and the carburettor from overpressure. Its chrome finish gives a neat, classic look under the hood, and the design suits Facet-style diaphragm pumps and other low-pressure systems commonly found on motorcycles, classic cars, and custom builds.

How does this regulator keep carburettors running smoothly?

The PTNHZ RACING regulator maintains a consistent downstream pressure so the carburettor float and jets receive steady fuel flow, reducing flooding and lean spikes. Its manual dial lets you adjust for different jetting and altitude needs.

• Maintains 1–5 psi on the outlet, adjustable with the top dial.
• Helps stabilize float bowl level across load and rpm changes.
• Reduces the chance of rich running caused by excessive pump pressure.
• Chrome housing resists corrosion and looks tidy in engine bays.

Can I install this on a twin-carburettor setup?

Yes — the regulator is designed to work with single or twin carburettor installations. Position it after the pump and before the feed lines so both carburettors see the same regulated pressure.

• Fits inline between the pump outlet and carburettor feed lines.
• One regulator can serve two carbs when plumbing is split after the regulator.
• Works with common low-pressure pumps like Facet diaphragm units.
• Maximum input pressure should not exceed 7 psi to avoid damage.

How do I adjust and set the fuel pressure safely?

Use the numbered dial on the top to dial in pressure from 1 to 5 psi while monitoring with a fuel pressure gauge. Start at a low setting, check for proper idle and no fuel overflow, then incrementally increase if needed for performance or altitude compensation.

• Start at 1–2 psi for most stock carburettor applications.
• Monitor with an inline fuel pressure gauge during adjustment.
• Do not exceed the regulator’s or pump’s maximum ratings (input max 7 psi).
• Tighten fittings and inspect for leaks after every adjustment.

What are the build and compatibility details I should know?

The unit features a polished chrome exterior and compact inline body designed for low-pressure systems. It is compatible with common fuel hoses and clamps used on vintage and performance carburettors as long as you respect the 7 psi input ceiling.

• Chrome finish for corrosion resistance and classic styling.
• Top-mounted numbered adjustment dial for precise control.
• Intended for low-pressure electric or mechanical pumps (Facet-style).
• Maximum inlet pressure: 7 psi — do not exceed this value.

Who is this for? If you run single or twin carburettors on motorcycles, classic cars, kit cars or custom builds and need a simple, reliable way to dial in low fuel pressure, this PTNHZ RACING manual adjustable regulator is made for you. It suits tuners who prefer a manual control, restorers who value a period-correct chrome finish, and builders using low-pressure diaphragm pumps who want predictable fueling without complex electronics.