Radium Engineering DMR-RA Direct Mount Fuel Pressure Regulator

Radium DMR-RA Direct Mount Fuel Pressure Regulator

Application: Universal – mounts directly to 8AN ORB fuel rail ports (6AN/10AN ORB with optional unions, or off-rail with 20-0624)
Part Type: Compact adjustable direct-mount fuel pressure regulator (RA-series)
Part Number: 20-1623-00, 20-1623-01

The Radium Direct Mount Regulator (DMR) is a compact, adjustable EFI fuel pressure regulator designed for high-flow fuel systems where space is tight. It mounts directly to an 8AN ORB fuel rail port – such as those on Radium fuel rails – using the included swivelling inlet fitting, or off-rail with the optional remote mount kit.

Pressure is set with a tool-less knob with no jam nut or set screw, and the threads are sealed against vacuum/boost leaks. A single stainless steel return orifice creates laminar flow for improved pressure stability.

Key Features

• Direct Mount: Swivelling inlet fitting mounts the regulator straight onto an 8AN ORB fuel rail port
• Tool-less Adjustment: Knob adjustment with no jam nut or set screw, and no vacuum/boost leaks through the threads
• Stable Pressure: Single stainless steel return orifice for laminar flow
• Vacuum Reference: 360° swivelling, double O-ring sealed port with interchangeable 10-32 threaded fittings
• Gauge Ports: Two 1/8" NPT side ports (plugs included)
• Fuel Compatibility: All gasoline types (unleaded, leaded, oxygenated, pre-mix) and alcohol blends (methanol, ethanol, E85)

Available Configurations

• 20-1623-00: Black
• 20-1623-01: Green

What's Included

• Main rotating assembly
• Swivelling inlet fitting for 8AN ORB fuel rail
• 6AN male 90° swivel for return line
• 5mm barbed vacuum fitting
• 3AN male vacuum fitting
• 1/4" push-to-connect vacuum fitting
• Vacuum plug fitting (returnless systems)
• PTFE-impregnated 1/8" NPT plugs (x2)

Optional Parts

• Radium Engineering 6AN ORB to 6AN ORB Swivel Union (14-0706) – for 6AN ORB fuel rails – replaces the included 8AN fitting
• Radium Engineering 10AN ORB to 6AN ORB Swivel Union (20-1006) – for 10AN ORB fuel rails – replaces the included 8AN fitting
• Radium DMR Direct Mount Regulator Remote Mount Adapter Kit (20-0624) – stainless bracket and inlet fittings for off-rail mounting
• Radium Fuel Pressure Gauge 0-100psi (20-0029) – seals into either 1/8" NPT port
• Radium Fuel Pressure Gauge With 90 Deg Adapter (20-0407) – gauge with 90° 1/8" NPT adapter
• Radium Diaphragm Service Replacement FPR (18-0017) – replacement diaphragm

Important Notes

• Regulator inlet port is 6AN ORB female – the included adapter suits 8AN ORB ports; other port sizes need the optional unions
• Use a medium-strength wicking thread locker on the vacuum fitting and PTFE paste on gauge threads
• The vacuum plug is required for returnless systems
• Maximum pressure depends on the pump relief valve or pump controller maximum current
• 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 with an 8AN ORB fuel rail port (6AN/10AN ORB with optional unions, or remote mounted with 20-0624)

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.