Radium
Radium FCST-X 1 Surge Pump and 1 Lift Pump Included Walbro GSS342 (20-1990-01)
Radium Engineering FCST-X – Fuel Cell Surge Tank System
The Radium Engineering FCST-X (Fuel Cell Surge Tank – 10 Year Edition) is the latest evolution of the market-leading FCST system, engineered to deliver uncompromised fuel delivery for high-performance and competition vehicles. Designed to eliminate fuel starvation under extreme track conditions, the FCST-X integrates a lift pump, surge tank and up to four high-pressure pumps within the safety of a fuel cell.
Ideal for motorsport, high-power road builds, drift, time attack and endurance racing.
Compatibility
The FCST-X can be installed into:
• All Radium Engineering fuel cells
• Any fuel cell using a 6" x 10" 24-bolt, top-mount flange
• Minimum fuel cell depth: 7.7" (196mm) from top surface to internal floor
Why Choose the FCST-X?
The FCST-X combines the proven reliability of the original FCST with a decade of improvements, delivering:
Key Upgrades vs Previous FCST Models
• Rapid fuel pump access – only 9 bolts to remove
• Integrated service handle for quick pump changes
• Enlarged internal surge tank – now 2.6L (up from 2.2L)
• Supports up to 4 fuel pumps including brushless options
• Reduced potential leak points and improved internal fluid control
• Compatible with shrouded fuel level sensors
• Anti-rotation electrical terminals & enhanced rollover protection
Retained Core FCST Features
• Internal 1-way fill valves keep surge tank full (3 x 355LPH flow)
• Merged -10AN ORB main outlet with internal check valves
• Multiple pump compatibility (gerotor, turbine, brushless)
• Hermetically-sealed high-current terminals
• Full CNC-machined aluminium construction with anodised finish
• Compatible with petrol, ethanol, E85, methanol, leaded/unleaded fuels
• Optional surge-level fail-safe & LED diagnostic output
How It Works
A lift pump feeds fuel from the cell into the internal 2.6L surge tank. The surge pumps then supply the engine with constant high-pressure fuel.
Even if the lift pump is momentarily starved under cornering, the surge tank ensures uninterrupted fuel supply. Excess fuel returns to the main cell automatically.
This design prevents pressure drop, fuel cut and lean conditions – essential for high-G track and competition use.
Ports & Fittings
| Port | Thread / Size | Supplied Fitting | Purpose |
|---|---|---|---|
| Pump Out | -10AN ORB (7/8-14) | -10AN ORB to -8AN male | High-pressure engine feed |
| Return | -8AN ORB (3/4-16) | -8AN ORB to -6AN male | FPR return |
| Vent | -12AN ORB (1-1/16-12) | -12AN ORB to -8AN male | Cell vent / breather |
