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Description  more details

Click here to download installation instructions (PDF)

This Gen 1 DMR only for connection to 6AN ORB or 2-Bolt Flange.
CLICK HERE for new DMR with connection for 8AN ORB.

The Direct Mount Regulator (DMR) is a compact high peformance adjustable EFI fuel pressure regulator that is designed to mount directly to a compatible fuel rail. It is the perfect solution for simplifying a high-flow fuel injection system. It's unique 360 degree swivel inlet fitting adapts directly to a fuel rail female port. The return line from the DMR back to the fuel tank can attach to either side of the regulator via the included 6AN male adapter fitting.

NOTE: This regulator must mount to a fuel rail, it cannot be used in a stand-alone installation. For a stand-alone pressure regulator, see the Radium Multi-Port Regulator (MPR).

Two interchangeable orifices are included with calculated flow diameters to match the fuel pump flow to the regulator. Furthermore, this added precision will resist diaphragm flutter and optimize pressure stability. See the installation instructions for more details. 

Either of the lower two opposing -6AN ORB ports can be used for the return line. NOTE: These ports CANNOT be used for fuel pressure gauge or sensor as these are low pressure ports. Using the included fittings, simply install the 6AN male into the port that points in the ideal direction and install the plug into the remaining port. Fuel pressure is dialed in using the preloaded set screw on top. 

The 1:1 vacuum reference high flow design has been tested to regulate over 1,400 liters per hour (see MORE DETAILS tab). Furthermore, with the addition of interchangeable return orifices, the DMR can be used most any horsepower level. Compatible with all gasoline and ethanol blends of fuel.

For a 3AN vacuum signal adapter fitting, CLICK HERE.


-Fuel Pressure Regulator (Black or Green Top)
-Inlet Adapter Fitting
-6AN ORB to 6AN Male (for return line)
-6AN ORB Plug
-Interchangeable Return Orifices
-Stainless Steel Hardware
-FKM Viton O-rings

For fuel rails with 6AN ORB ports, select 20-0393-00/01
This can be used with aftermarket fuel rails that use 6AN ORB (9/16-18 O-ring boss) threaded ports.
1. This 6AN ORB inlet port is NOT compatible with a 6AN hose end. It MUST thread into a female 6AN ORB port.
2. This variation is NOT compatible with Radium fuel rails which use 8AN ORB threads.

For OEM fuel rails with a 2-bolt flange connection, select 20-0418-00/01 
This variation can be used with some OEM fuel rails to replace the factory regulator. The included adapter mates to an 11mm bore and M6 bolt holes that are symmetrically spaced 39mm apart. See photo below:

This architecture is common to the following engines: 
Toyota 2RZ-FE
Toyota 3RZ-FE
Toyota 4E-FTE
Toyota 4A-GZE
Toyota 4A-GE
Toyota 4A-GELU
Toyota 2JZ-GTE (not compatible with OEM intake manifold/throttle body)
Saab 9-2X Aero 2.0L
Subaru EJ20 GDA WRX
Mazda MX-5 BP

While the DMR will properly secure to these OEM fuel rails, compatibility has NOT been verified when installed with the intake manifold on the engine.
In some cases, there will be an interference preventing the use of the DMR. As an example, this adapter will fit onto the Mitsubishi EVOX 4B11T fuel rail, but it interferes with the MIVEC solenoid. Reference the dimensions below to determine if the DMR can physically reside in your specific application. 



Select the anodized color of the DMR's CNC machined billet top:

Bright Dipped Black or Radium Green


The graph below shows the minimum fuel pressure the regulator can achieve as a function of pump flow rate. This test was performed with the adjustment screw completely backed out, no preload.

For example, if you have two pumps that flow 320LPH (total 640LPH), the approximate minimum pressure the regulator can achieve is about 23.5 psi. Note: if an OEM fuel pressure regulator is used for 640LPH, it will likely not be able to bypass enough fuel.

With the Radium DMR, simply spin the set screw clockwise to achieve higher pressures. Note: Most EFI systems operate at 43.5 psi (3Bar) static fuel pressure.


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