RADIUM ENGINEERING MULTI-PORT FUEL PRESSURE REGULATOR (MPR)

Complex fuel systems demand a regulator that doesn't force compromise. The Radium Engineering Multi-Port Fuel Pressure Regulator (MPR) is engineered to handle everything from a single-pump street build to a dual-pump, dual-rail race setup — without extra fittings, without tools, and without pressure instability under load.

ONE REGULATOR, ANY CONFIGURATION

The MPR's unique port layout lets you combine dual fuel pumps into a single feed line, or split a single feed into a dual-bank, dual-rail system. Running a simple single-pump, single-rail setup? Just plug the unused ports. One part number covers the build now and whatever you scale to next.

TOOL-LESS PRESSURE ADJUSTMENT

RA-series regulators were the first to ditch the jam nut and set screw in favour of a simple adjustment knob — no tools required, no thread-based air leaks for a boost/vacuum leak check to flag. Incremental detents give tactile feedback with each turn, with every detent equal to roughly 1psi (±0.5psi) of adjustment depending on current fuel pressure.

BUILT FOR STABILITY UNDER LOAD

Backed by years of track and bench testing, the RA-series platform uses a newly designed single stainless steel return orifice to generate laminar flow, holding fuel pressure steady when it matters most — under boost, under load, lap after lap.

Key Features:

  • Multi-Port Configuration – Combine dual pumps into one feed line, or split one feed into a dual-rail system
  • Tool-Less Adjustment Knob – Fine-tune pressure by hand, with detented haptic feedback (~1psi per detent)
  • 360° Swiveling Vacuum Reference Port – Double O-ring sealed; points any direction with no tools needed
  • 4 Interchangeable Vacuum Fittings Included – Barbed, 3AN male, push-to-connect, and a vacuum plug for returnless systems
  • Flexible Mounting – Wall-mount via M6 through-holes or floor-mount with the included bracket; M6x1mm hardware supplied
  • Simplified Plumbing – Parallel-flow lower return ports eliminate the need for elbow fittings or an extra "Y"
  • Broad Fuel Compatibility – Runs all gasoline types plus alcohol blends including methanol, ethanol, and E85
  • 1:1 Rising Rate Vacuum Reference – Laminar-flow return orifice for consistent pressure control

Specifications:

Feature Details
Manufacturer Part Number 20-1100-00
Minimum Pressure 18.5psi (1.3 bar)
Maximum Pressure Limited by pump relief valve or fuel pump controller current — not regulator-limited
Adjustment Tool-less knob, detented ~1psi (±0.5psi) increments
Vacuum Reference Port 360° swivel, double O-ring sealed, 10-32 threaded
Included Vacuum Fittings Barbed (3/16"–7/32" hose), 3AN male, push-to-connect (1/4" OD), vacuum plug
Mounting Hardware M6x1mm, wall or floor mount (bracket included)
Fuel Compatibility All gasoline types; alcohol blends including methanol, ethanol, E85
Return Orifice Single stainless steel, laminar-flow design
Country of Manufacture USA (unconfirmed against RI supplier documentation — flag for confirmation before publishing)