Radium Fuel Surge Tank kit – E46 BMW


Radium Engineering Fuel Surge Tank kit for BMW E46 M3/Non-M



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Click HERE to download the installation instructions (PDF)

This comprehensive installation kit includes everything needed to install a Radium fuel surge tank with a single 39mm fuel pump or a Bosch 044 fuel pump in a 1999-2006 BMW E46 3-series or M3, but excluding all convertibles. The base price is for the installation kit only. The fuel surge tank (FST) is sold separately or select a surge tank from the options above. Note: The kit was not designed to work with the Radium MPFST. The kit was also not designed to be used with a Radium FST-R, but it can be accomplished with a few extra steps (not described in manual).

Here is a informative video on how a Radium Fuel Surge Tank works:

All Radium FSTs feature anodized aluminum surfaces, submersible hose, etc. to make them alcohol (ethanol/methanol/E85) compliant.

The BMW install kit locates the FST in a collision-safe area of the trunk behind the rear seat. The bolt-on powdercoated aluminum mounting bracket features rubber isolating grommets to reduce fuel pump noise.

Also included is a fully assembled plug and play wiring harness featuring a weatherproof fuse and relay to drive the FST’s fuel pump. A Delphi weatherpak connector is also provided for the fuel pump trigger activation to make the entire system modular.

Included are 8 PTFE hoses which are cut to length and preassembled. The PTFE hose is great for all types of fuel, especially with high alcohol contents, such as ethanol (E85). Unlike standard rubber hose, PTFE is non-permeable and eliminates any possible fuel vapor smell. These PTFE hoses use anodized aluminum hose ends are cut-to-length specifically for this application. The inner stainless steel braid resists extreme fuel pressures and is covered with black PVC which gives the hose added protection from debris and provides abrasion protection. Supplied in -6AN size only.

The PTFE hoses mate at a junction point in the trunk using 4 bulkheads fittings and a billet aluminum plate for interior aesthetics.


BMW Install Kit Features:

-Preassembled 3/8″ PTFE Hoses
-Powder Coated Mounting Bracket with Vibration Isolators
-AN Bulkhead and Adapter Fittings
-Stainless Steel Hardware
-Installation Instructions
-Complete Wiring Harness with Relay and Fuse
-Anodized Billet Aluminum Bulkhead Plate

Shown below is an 18 minute track session of vehicle without a fuel surge tank installed.

X Axis: Fuel Pressure above 1500RPM Note: Pressure SHOULD be ~47.5psi constant

Weight 30 lbs
Fuel Surge Tank

Already have a Fuel Surge Tank, Walbro GSS342 255lph FST – ($570.00), AEM 50-1200 E85 FST – ($629.00), Walbro F90000267 E85 FST – ($689.95)