Radium Engineering Fuel Hanger Surge Tank Audi R8 (42 / 4S) / Lamborghini Huracan

The Radium Engineering FHST is a drop-in fuel surge tank solution designed to support high-power builds and ensure consistent fuel delivery in Audi R8 (Gen2) and Lamborghini Huracan models. This system provides a dedicated fuel supply for port injection, operating independently from the OEM direct injection system.

Key Features:

• Drop-in fitment with no modification required

• Supports high-output aftermarket fuel pumps (sold separately)

• Isolates port injection system from OEM direct injection components

• Prevents fuel starvation and pump cavitation during aggressive driving

• Compatible with gasoline, ethanol (E85), and methanol

• Anodized aluminum construction with stainless steel hardware

• Fuel-resistant tubing, wiring, and sealed electrical connections

• High-current electrical terminals with non-conductive acorn nuts

System Benefits:

• Eliminates OEM fuel rail restrictions by separating port and direct injection

• Increases fuel reserve around the pump to prevent starvation

• OEM fuel level sensors and components remain fully functional

• Ideal for custom or high-power port injection setups

Fuel Pump Compatibility:
Compatible with a wide range of brushed and brushless fuel pumps, including:
Walbro 267 / 274 / 285 / 295 / GSS342, AEM 50-1200, Bosch BR540, Deatschwerks DW400 / DW440 / DW810, Protec 11928, Fuelab 49614, and Injector Dynamics BPC1000.
(Sock filters included or supplied by manufacturer, depending on pump model)

How It Works:
The FHST installs on the left-hand side of the fuel tank, opposite the OEM pump. It draws fuel from:

1. The OEM venturi jet pump (302LPH tested)

2. Return flow from an external fuel pressure regulator

3. Three one-way fill valves flowing a combined 1,065LPH

This setup ensures a reliable fuel supply even in high-G or low-fuel conditions.

Note:

• For Gen2 R8 and Huracan models, maintain a minimum ½ tank during track use.

• Not compatible with Gen1 Audi R8 or Lamborghini Gallardo without additional components.

A recommended relay kit (Radium 17-0031) is advised for powering the internal pump.