Radium Engineering 20-1100-01 MPR-RA Multi-Port Fuel Pressure Regulator Green

Vehicle Fitment

• Universal - no direct OEM vehicle fitment assigned
• Designed for EFI fuel systems requiring a versatile adjustable fuel pressure regulator capable of handling single or dual pump configurations and single or dual fuel rail layouts
• Suitable for pump flows from 200 to 1,400 LPH

Fitment Notes

• The -01 suffix denotes a Radium green anodized top - functionally identical to the 20-1100-00 black top version
• Direct replacement design for discontinued Radium part number 20-0100-01 (green top MPR)
• Can be plumbed before or after the fuel rail(s) - flow-through or dead-head configurations supported
• Wall or floor mounting supported using the included bracket or the M6 pass-through holes in the regulator body
• Sold individually - one regulator per unit

Features

• Unique multi-port design combines dual fuel pump outlets into a single feed line or splits a single feed line to dual fuel rails - eliminates the need for a separate "Y" fitting
• Tool-less RA-series pressure adjustment via rotating knob with incremental detents - approximately 1 psi per click, no jam nut or set screw required
• Industry-first 360° swiveling vacuum reference port with double O-ring seal - can be pointed in any direction without tools; compatible with 4 interchangeable vacuum fittings (barb, 3AN male, push-to-connect, and plug)
• Newly designed single stainless steel return orifice generates laminar flow for enhanced fuel pressure stability
• Five ports (A, B: 6AN ORB feed; E: 8AN ORB feed; C, D: 6AN ORB return) allow flexible plumbing for virtually any EFI fuel system layout
• Dual opposing return ports flow parallel with the pressure ports - no elbow fittings required on the return side
• Compatible with all fuel types - unleaded, leaded, oxygenated, pre-mix, methanol, ethanol, and E85
• Radium green anodized CNC machined billet aluminum top with black anodized body, laser etched branding

Specifications

• Configuration: Multi-Port Regulator - Rotating Assembly (MPR-RA)
• Top Color: Radium green anodized
• High-Pressure Ports A & B: 6AN ORB (9/16-18)
• High-Pressure Port E: 8AN ORB (3/4-16)
• Return Ports C & D: 6AN ORB (9/16-18)
• Vacuum Reference Port: 360° swiveling, 10-32 threaded, double O-ring sealed
• Pressure Adjustment: Tool-less, ~1 psi per detent click
• Minimum Pressure: 18.5 psi (1.3 bar)
• Maximum Pressure: Limited by fuel pump relief valve or controller
• Flow Range: 200-1,400 LPH
• Fuel Compatibility: All gasoline types, methanol, ethanol, E85
• Mounting: M6x1mm hardware (floor or wall mount)
• Construction: CNC machined billet aluminum, anodized and laser etched, made in USA

Included Components

• 1x MPR-RA regulator assembly (green top)
• 1x Mounting bracket with M6x1mm hardware
• 5mm barbed vacuum fitting
• Vacuum plug fitting (for returnless applications)
• 1/4 in. push-to-connect vacuum fitting
• 3AN male vacuum fitting
• 6AN ORB plug (x2)
• 8AN ORB plug (x1)
• 6AN ORB to 6AN male adapter (x3)
• 8AN ORB to 8AN male adapter (x1)

Product Description

The Radium Engineering 20-1100-01 MPR-RA is the green-top variant of Radium's latest generation Multi-Port Regulator - the replacement for the discontinued 20-0100-01. It is a universal adjustable fuel pressure regulator built for EFI systems ranging from simple single-pump dead-head setups to complex dual-pump, dual-rail configurations. The multi-port layout eliminates the need for external "Y" fittings, with dedicated 6AN and 8AN ORB high-pressure ports on top and parallel-flow return ports on the bottom that don't require elbow fittings. The tool-less RA-series adjustment knob with haptic detents allows precise pressure setting at approximately 1 psi per click without any tools.

A standout feature is the industry-first 360° swiveling vacuum reference port with double O-ring sealing, allowing the vacuum fitting to be aimed in any direction post-installation - no need to plan the hose routing before assembly. Four interchangeable vacuum fittings are included to suit barbed hose, 3AN hose ends, hard plastic tubing, or returnless (plugged) installations. A single stainless steel return orifice produces laminar flow for improved pressure stability under demanding conditions. Compatible with all standard and alcohol-blend fuels including E85.