RADIUM fuel rail for BMW S54, Aftermarket fitment


Radium Engineering fuel rail for BMW S54 Engine, M3/Z3/Z4 – Aftermarket line configuration

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This big bore fuel rail is machined, polished, laser etched and then anodized for a stealth surface finish. It is compatible with OEM and aftermarket fuel injectors. It features a large 0.65″ internal bore with 3/4″-16 female threads (-8AN O-ring port) at each end to accept a variety of adapter fittings for custom high flow fuel system builds. It is compatible with all fuel types including popular alcohol mixtures such as E85. It is a direct bolt on for all S54 BMW engines including:

2001-2006 BMW M3
2001-2002 BMW Z3 M Coupe
2001-2002 BMW Z3 M Roadster
2006-2008 BMW Z4 M Coupe
2006-2008 BMW Z4 M Roadster
2002-2011 Weismann Roadster MF3

All configurations include a 3/8″ NPT plug for the center port and a 3/4″-16 plug for the front port. Also included are stainless steel mounting tabs and hardware preassembled using aluminum rivet nuts.


Aftermarket Configurations
Aftermarket configurations are available for flexibility when plumbing a custom high flow fuel system. The pair of adapter fittings are available in -6AN, -8AN, and -10AN. This is intended to be used when building a high horsepower fuel system using aftermarket pumps, hose, and fittings. This option includes two adapters but does not include a feed hose. If your system will be plumbed as a dead end like the BMW rail, only one of these fittings will be used and the included plug (or optional fuel pressure gauge) will be used for the other end of the rail. Professional installation is suggested when building a high flow fuel system.


Optional Add-Ons

Front Port:
The front port of the Radium fuel rail is machined with 3/4″-16 (-8AN) threads. Instead of using the included plug, a billet aluminum adapter can be installed enabling the use of a Radium fuel pressure gauge, as shown. More info on the Radium Fuel Pressure Gauge can be seen HERE.

Center Port:
A 3/8″ NPT port is machined in the center port.  A standard 3/8″ NPT plug is included with the kit. However, an optional fuel pulse damper can be installed alternatively. A pulse damper absorbs injector pulses which can cause fluctuation in fuel pressure, especially with high flowing aftermarket fuel injectors. See picture below:

Weight 10 lbs

Aftermarket line configuration, 6AN fittings, Aftermarket line configuration, 8AN fittings, Aftermarket line configuration, 10AN fittings

Add pulse damper?

No, Yes (+$39.95)

Add pressure gauge?

No, Yes (+$47.90)