Radium Engineering Fuel Surge Tank Install Kit – Focus ST 13–18 / Focus RS 16–18

This comprehensive Radium Engineering install kit includes everything needed to mount and plumb a Radium FSTR-RA (Fuel Surge Tank Regulated) unit into your 2013+ Focus ST or 2015+ Focus RS. Designed for seamless integration, this kit replaces the factory low-pressure fuel supply to protect against fuel starvation and ensure consistent delivery to the OEM high-pressure fuel pump (HPFP).

Key Features:

• Direct-fit mounting bracket installs under the car in a collision-safe location near the rear bumper support

• Clean, reliable integration with OEM feed and return systems

• Billet adapter redirects return flow to the OEM fuel filler neck

• Vacuum-referenced or static fuel pressure control via FSTR-RA’s integrated regulator

• No permanent modifications or cutting required

Fuel System Operation:
The OEM low-pressure pump now feeds the surge tank, which then sends regulated fuel to the HPFP. Any excess is returned to the tank through the included billet return adapter. This configuration prevents starvation under hard cornering or acceleration.

What’s Required (Not Included):

• Radium FSTR-RA Surge Tank

• Fuel Pressure Adjustment Method – via COBB Accessport or Radium 20-0152 fuel pressure gauge adapter

Notes:

• Simple, no-solder wiring setup – installs in under 30 minutes

• Fully E85 and race fuel compatible

A must-have upgrade for Focus ST/RS owners pushing their cars on track or with high-performance builds requiring consistent fuel delivery under all conditions.