Radium Fuel Rails, Top Feed Upgrade, Subaru Phase-I Ez30

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  • Regular price $379.95

The fuel rail ports are tapped for 8AN ORB.

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. 


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

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

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.

-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)