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Our Price: $149.95
Fuel Rail:
Plumbing Kit:


Click here to download installation instructions (PDF)


The fuel rail ports are tapped for 8AN ORB.

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.

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.


Mazda MZR (DOHC Inline-4)
Ford Duratec (DOHC Inline-4)

This Radium Engineering fuel rail is CNC machined from extruded 6063 aluminum, black anodized, and laser etched for a high quality surface finish.

Like the original fuel rails, the injector bores are 14mm ID so factory injectors are permitted. Furthermore, provisions for the OEM injector retaining clips are implemented as well.

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

Spacers and washers are included to thermally insulate the fuel rail from the cylinder head. 


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’.


20-0503-02 Fuel Rail, Mazda MZR and Ford Duratec
This product includes the fuel rail and the mounting hardware making it ideal for custom applications.
-Black Anodized Laser Etched Fuel Rail
-Stainless Steel Mounting Hardware
-Thermal Insulating Spacers
-Thermal Insulating Washers

20-0503-PK Fuel Rail Plumbing, Mazda MZR and Ford Duratec
This kit includes all of the necessary adapters making the 20-0503-02 fuel rail a direct OEM fuel rail replacement.
8AN ORB Plugs
-8AN ORB SAE Fitting

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