Radium Engineering FSTR RA Fuel Surge Tank with Integrated FPR Fuel Pressure Regulator

Radium FSTR RA Fuel Surge Tank w/Integrated FPR Fuel Pressure Regulator

Application: Universal
Part Type: Fuel surge tank with integrated RA-series fuel pressure regulator (single pump)
Part Number: 20-1933

The Radium FST-R (FSTR-RA) prevents engine fuel starvation on vehicles with poor fuel tank baffling. An internal pump feeds the fuel rail(s) while the fuel volume in the surge tank acts as a buffer, kept full by the lift pump in the main tank and by fuel returned from the regulator. It also allows a fuel pump upgrade without modifying the OEM tank.

The regulator is built into the top cap and returns excess fuel to the main tank, eliminating an external regulator, extra fittings and hoses while keeping fuel cooler. It features tool-less adjustment with detents and a 360° swivelling, double O-ring sealed vacuum reference port.

Key Features

• Integrated Regulator: RA-series FPR built into the top cap, returning excess fuel to the main tank
• Tool-less Adjustment: Detents give approx. 1 psi (±0.5 psi) per click
• Optional 1:1 Vacuum Reference: Swivelling port with four interchangeable 10-32 fittings
• Anti-Aeration: Internal flow deflector prevents foaming and aeration
• Electrical: Anti-rotation stainless terminals, non-conductive acorn nuts, ETFE-insulated in-tank wiring, billet dust cap
• Construction: Full CNC aluminium, anodised, with FKM O-ring interfaces and stainless hardware
• Fuel Compatibility: All petrol types (unleaded, leaded, oxygenated, pre-mix) plus methanol, ethanol and E85

What's Included

• FST-R surge tank with integrated RA-series regulator
• Three pre-installed 6AN fittings plus one 6AN to 8AN adapter
• Four 10-32 vacuum fittings (barbed, 3AN male, push-to-connect, vacuum plug)
• Electrical hardware for the pump
• Sock filters for listed AEM, Walbro and Ti Automotive pumps

Optional Parts

• Radium Fuel Surge Tank Mounting Bracket, Universal (Side / Floor Mount) (13-0054) - Laser-cut anodised aluminium side or bottom mount
• Radium DIY Fuel Pump Hard Wiring Kit (17-0031) - Recommended relay/wiring kit to drive the internal pump
• Radium Engineering Check Valve - 6AN ORB to 8.5mm Barb (20-1533) - Check valve for AEM 50-1230 / 50-1235
• Radium Engineering Check Valve - 6AN ORB to 10mm Barb (20-1534) - Check valve for Walbro F90000295, Bosch BR540 and Ti Automotive E5LM

Important Notes

• Single-pump design - not available in a dual-pump configuration
• A fuel pressure gauge or sensor is required to set and monitor pressure - install it anywhere between the regulated output and the fuel rail(s)
• A relay kit is recommended to drive the internal pump
• AEM 50-1230 / 50-1235 have no check valve (use 20-1533 if required); Walbro F90000295, Bosch BR540 and Ti Automotive E5LM have no check valve (use 20-1534 if required)
• Mount away from heat sources, moving parts, suspension components and common collision areas
• Other compatible pumps exist that are not listed by Radium
• Installation instructions are available in the Instructions tab

Vehicle Fitment

• Universal - see Application

For application support, send your vehicle details to TJ Auto Parts through the Parts Finder.

Supplier-listed applications:
- Universal - see Application

Note: Compatibility information is provided as a general guide only. Some vehicles may have multiple part variations for the same model or engine. To ensure this product is the correct fit and to be eligible for our Fitment Guarantee, please contact our team before purchasing.