Radium Engineering FPRD RA Fuel Pressure Regulator Damper

Radium FPRD RA Fuel Pressure Regulator Damper

Application: Universal – EFI fuel systems (return-style, plumbed after the fuel rail)
Part Type: Adjustable fuel pressure regulator with integrated fuel pulse damper (RA-series)
Part Number: 20-1528-00, 20-1528-01

The Radium FPR-D combines a fully functional, adjustable high-performance fuel pressure regulator and a fuel pulse damper in one high-flow unit. The integrated damper smooths out the pressure pulses created by injector operation and the fuel pump, giving a steadier fuel pressure signal.

Like all RA-series regulators it features tool-less pressure adjustment and a 360° swivelling vacuum reference port, and it can be mounted in any orientation – even upside down.

Key Features

• Regulator + Damper: Adjustable EFI fuel pressure regulator with a built-in fuel pulse damper
• High Flow Ports: 10AN ORB (7/8"-14) inlet (side) and outlet (bottom) ports
• Auxiliary Port: 1/8" NPT port for a fuel pressure gauge or sensor (plug included)
• Vacuum Reference: 360° swivelling, double O-ring sealed port with interchangeable 10-32 threaded fittings
• Any Orientation: Can be mounted in any orientation, including upside down
• Fuel Compatibility: All gasoline types (unleaded, leaded, oxygenated, pre-mix) and alcohol blends (methanol, ethanol, E85)

Available Configurations

• 20-1528-00: Black
• 20-1528-01: Green

What's Included

• Main rotating assembly with damper
• Mounting bracket with M6x1mm hardware
• 5mm barbed vacuum fitting (x2)
• Vacuum plug fitting, returnless (x2)
• 1/4" push-to-connect fitting (x2)
• 3AN male vacuum fitting (x2)
• 6AN male adapter (x2)
• 8AN male adapter (x2)
• 1/8" NPT port plug
• Vacuum hose Y-adapter
• Vacuum hose, 5/32" ID

Optional Parts

• Radium Fuel Pressure Gauge 0-100psi (20-0029) – fits the 1/8" NPT port to monitor fuel pressure
• Radium Diaphragm Service Replacement FPR (18-0017) – replacement FPR diaphragm
• Radium Diaphragm Service Replacement FPD (18-0018) – replacement FPD (damper) diaphragm

Important Notes

• Single inlet and single return port – cannot be used in a dead-head system and must be plumbed after the fuel rail (use the Radium MPR for dead-head systems)
• Not for use with mechanical fuel pumps or direct-injection high-pressure pumps – their pulses will quickly rupture the damper diaphragms
• Damper works most efficiently at 2.8-7.2 bar (40-105 psi) static base pressure; outside this range the damper vacuum/boost reference line is required
• Use a medium-strength wicking thread locker on the vacuum fitting; returnless systems require the vacuum plug
• A rapid fuel pressure drop after the engine or pump is switched off is normal for aftermarket regulators – pressure resets as soon as the pump is reactivated
• Long cranking or slow pressure build-up is not caused by the regulator – it usually points to the feed line draining back to the tank (e.g. a leaking pump module, venturi jet pump or missing check valve)
• Installation instructions are available in the Instructions tab

Vehicle Fitment

• Universal – any EFI fuel system (return-style, regulator after the fuel rail)

If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.

Installation

We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.

Note

Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.