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)

For application support, send your vehicle details to TJ Auto Parts through the Parts Finder.

Supplier-listed applications:
- Universal - any EFI fuel system (return-style, regulator after the fuel rail)

Note: Compatibility information is provided as a general guide only. Some vehicles may have multiple part variations for the same model or engine. To ensure this product is the correct fit and to be eligible for our Fitment Guarantee, please contact our team before purchasing.