Radium Fuel Rails, Top Feed Upgrade, Subaru

Download discontinued 20-0467-02 fuel rail instructions (PDF)

8AN ORB Adapter Fittings can be found HERE.

8AN ORB Direct Mount Regulators can be found HERE.

8AN ORB Fuel Pulse Dampers can be found HERE.

Fuel Pressure Gauge Adapters can be found HERE.

Want a complete engine bay plumbing kit that includes regulator, lines and fittings? Click Here

Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.

Reference the chart below to be sure the proper fuel rails are ordered.


Manufactured with a large internal bore, the fuel rails can support all necessary engine power requirements. They are CNC machined from solid 6061 aluminum, black anodized, and laser etched for a high quality surface finish. 

These fuel rails are designed specifically for OEM or equivalent fitment injectors. For injector height flexibility and thermal insulation, 2 sets of machined insulating spacers are included. All injectors must use 11mm diameter upper O-rings just like the OEM Subaru injectors. Reference instruction manual for more information.

The fuel rails are compatible with all fuel types including popular alcohol mixtures such as E85. 

20-0567-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ

VEHICLE COMPATIBILITY
02-14 Subaru Impreza WRX (USDM)
07-14 Subaru Impreza WRX (JDM/EDM)
07-21 Subaru Impreza WRX STi
06-13 Subaru Forester XT
01-03 Subaru Legacy GT (JDM)
07-12 Subaru Legacy GT
07-12 Subaru Outback XT
05-06 Saab 9-2X Aero

FUEL INJECTOR COMPATIBILITY
This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’.

OVERVIEW
These fuel rails have the same mounting and injector spacing as the 20-0577-02. However, these fuel rails feature a 8AN ORB port machined in the underside center of each fuel rail, as shown below.

NOTE: The center port bulge can create an interfere with early AVCS solenoids found in the EJ207 and JDM EJ205. If this is the case, use P/N: 20-0577-02 below.

INCLUDED
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Thermal Insulating Press-In Spacers, 20mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)

20-0577-02 FUEL RAILS, TOP FEED UPGRADE, SUBARU EJ, TOP PORT

VEHICLE COMPATIBILITY
01-06 Subaru Impreza WRX (JDM/EDM)
01-06 Subaru Impreza WRX STi (EDM)
01-02 Subaru Impreza WRX STi (JDM)

The vehicles below also require 20-0372
03-06 Subaru Impreza WRX STi (JDM)
04-11 Subaru Impreza (EJ253)
05-10 Subaru Forester (EJ253)
05-12 Subaru Legacy (EJ253)
06-09 Subaru Outback (EJ253)

FUEL INJECTOR COMPATIBILITY
This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’.

OVERVIEW
These fuel rails have the same mounting, injector spacing and fitment as the 20-0567-02 (above). However, each fuel rail has an 8AN ORB "top port", unlike 20-0567-02 which has a center lower port (picture below shown with Fuel Rail Adapter 20-0372). 

The added clearance is necessary for the EJ207 and JDM EJ205 engines that have early AVCS solenoids with vertical connectors (shown below).

INCLUDED
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Thermal Insulating Press-In Spacers, 20mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)

20-0764-02 FUEL RAILS, SUBARU PHASE-I EZ30 

VEHICLE COMPATIBILITY
00-04 Subaru Outback H6
00-03 Subaru Lancaster 6
02-03 Subaru Legacy GT30
02-03 Subaru Legacy RS30
2002 Subaru Blitzen 6 Wagon

FUEL INJECTOR COMPATIBILITY
OEM Injectors-The Radium Engineering fuel rail features 11mm injector bores making it compatible with the factory Subaru EZ30 Phase-I "air-assist" fuel injectors. No modifications are needed. If preparing to use aftermarket fuel injectors, read below.

Aftermarket Injectors-The Phase-I EZ30 uses air-assist emissions equipment. These engines use a unique OEM fuel injector that is not replicated in the aftermarket. In order to use universal aftermarket fuel injectors, these cylinder heads require the provided Radium injector seats. When these injector seats are installed into the air-assist cylinder heads, an aftermarket injector that is 48mm long with 11mm upper O-ring and 14mm lower O-ring must be used. The following universal injectors have been verified to be compatible. However there are others on the market that will work that are not listed here.

Injector Dynamics ID1050-XDS-48-11-14
Injector Dynamics ID1300-XDS-48-11-14
Injector Dynamics ID1700-XDS-48-11-14
Injector Dynamics ID2600-XDS-48-11-14

OVERVIEW
These H-6 fuel rails are for the original Subaru EZ30 "Phase-I" flat 6 engine. This engine is denoted by having a single exhaust port per bank. These engines also incorporate the Subaru air-assist fuel injection system.

Each fuel rail has three 8AN ORB threaded ports (6 total). To reuse the OEM FPR, use 20-0301.

INCLUDED
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Subaru Air Assist Injewctor Seats (x6)
-Thermal Insulating Press-In Spacers, 11mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x8)

20-0765-02 FUEL RAILS, SUBARU PHASE-II EZ30 AND EZ36

VEHICLE COMPATIBILITY
04-09 Subaru Legacy 3.0R
04-09 Subaru Outback 3.0R
10-19 Subaru Legacy 3.6R
10-19 Subaru Outback 3.6R
06-14 Subaru Tribeca

FUEL INJECTOR COMPATIBILITY
This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’.

OVERVIEW
These H-6 fuel rails are for the EZ30 (Phase-II) and EZ36 flat 6 engines.

As shown below, they are compatible with AVCS.

As shown below, there is ample clearance with the nearby AVCS solenoid.

As shown below, each fuel rail has three 8AN ORB threaded ports (6 total). 

INCLUDED
-Black Anodized Laser Etched Aluminum Fuel Rails (x2)
-Thermal Insulating Press-In Spacers, 11mm (x4)
-Stainless Steel M8x1.25 Mounting Bolts (x4)

20-0372 Fuel Rail Adapter, Ver8/9 EJ207, 2.5i EJ253

For more information and installation instructions regarding the 20-0372 Fuel Rail Adapter, Ver8/9 EJ207, 2.5i EJ253, go HERE. 

Subaru Fuel Rail Plumbing Kit for EJ Engines

For more information and installation instructions regarding the  Subaru EJ Fuel Rail Plumbing Kits, go HERE.