Radium Engineering FHST-RA Surge Tank Kit BMW E90/E91/E92/E93 N54/N55 (Walbro GSS342 / AEM 50-1200)

The Radium Engineering 20-1970 Fuel Hanger Surge Tank is a direct drop-in replacement for the OEM fuel pump assembly in BMW E90/E91/E92/E93 models equipped with N54 or N55 engines (and M3 with minor wiring adaptation). It supports one or two high-flow fuel pumps (Walbro GSS342 or AEM 50-1200 – not included), ensuring consistent fuel delivery for high-performance, turbocharged, or motorsport builds.

Its integrated surge tank design prevents fuel starvation during aggressive driving, hard cornering, acceleration, or braking. The drop-in CNC-machined anodized aluminum construction is E85-compatible and requires no permanent modifications to the fuel tank.

Key Features:

• Application: BMW E90/E91/E92/E93 N54/N55; M3 with wiring mods

• Pump compatibility: Walbro GSS342 / AEM 50-1200 (not included)

• Supports 1 or 2 pumps for maximum flow

• Material: CNC billet anodized aluminum – gasoline/E85 safe

• Drop-in installation: Direct OEM replacement, no tank cutting

• Surge tank function: Prevents fuel starvation under high G loads

• Return system upgrade option: Disable internal regulator for external FPR

• Outlet fitting: 8AN male

• Includes: 1-way valve, wiring harness, relays, fuses

Tech Specs:

Main Advantages:

• Eliminates starvation in motorsport/high performance

• High flow for extreme builds

• E85 compatibility

• Quick installation in OEM location

• Upgradeable to return fuel system

Note: Fuel pumps must be purchased separately.