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Radium Engineering DMR Fuel Pressure Regulator (20-0223-00)

  • $ 14245

Radium Engineering DMR (Direct Mount) Fuel Pressure Regulator

The Direct Mount Regulator (DMR) is the perfect solution for simplifying a high-flow fuel injection system. It's unique swivel inlet fitting adapts directly to the fuel rail eliminating external mounting and additional plumbing.

The DMR uses the same internals as the popular Radium Engineering MPR (Multi-Pump Regulator). This means it carries over the ability to change the orifice to match the regulator to the pump flow. See the installation instructions for more details. Either of the lower two opposing -6AN ORB ports can be used for the return line. 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 preload 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 in ANY horsepower output EFI system imaginable and is compatible with all gasoline and ethanol blends of fuel.

Is the DMR compatible with my fuel rail?
Your fuel rail must have an available port with compatible threads. See the different options for the adapters. Furthermore, your need to have about 2.5" of free space off the end of the rail. 


  • Compatible with all gasoline and ethanol blend fuels
  • Available with either black of green anodized finish


  • 2008-2015 Mitsubishi Lancer Evolution X

What's In The Box?

  • Fuel pressure regulator
  • Stainless steel hardware
  • Three interchangeable return orifices 
  • -6AN ORB (9/16"-18) plug
  • -6AN ORB (9/16"-18) to 6AN male
  • -8AN ORB inlet fitting


  • Manufacturer Standard Warranty


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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