Radium MPFST-R Multi-Pump Fuel Surge Tank with Built-In Regulator

The Radium MPFST-R is a multi-pump fuel surge tank with a built-in regulator, designed to eliminate fuel starvation in high-performance applications. Whether you're upgrading to forced induction or tracking your car under extreme G-forces, this surge tank maintains stable fuel supply to the engine by keeping the high-flow pumps fed at all times—even when the main tank's pickup is momentarily starved. It also simplifies plumbing by integrating a return-regulated design, making it ideal for modern returnless conversions and custom fuel systems.

What is a Surge Tank?
A surge tank acts as a buffer between the fuel tank and high-flow pumps. It stores a small volume of fuel, fed by the OEM lift pump or a dedicated low-pressure pump, and ensures uninterrupted fuel delivery during hard cornering, braking, or acceleration. Excess fuel returns to the main tank, and the integrated pressure regulator circulates fuel internally, reducing the number of external lines required.

Key Features

• Integrated RA-series fuel pressure regulator with tool-less adjustment

• Supports up to three internal fuel pumps (sold separately)

• Merged high-pressure outlet via -8AN male (10AN ORB port)

• Pre-installed -6AN adapters for overflow, supply, and return

• Internal swirl pot reduces air bubbles and fuel foaming

• Pre-pump stainless steel mesh filtration in each pump well

• Compatible with all fuels including E85 and methanol

• High-current, anti-rotation electrical studs with included wiring hardware

• Mountable to uneven surfaces such as trunk floors or tubs

• Fuel pressure reference port with 360° rotation and 4 included adapters

• Includes a 1/8” NPT port for optional pressure sensor or gauge

Pump Compatibility
Choose one of the following pump-specific kits to complete installation (sold separately):

• 20-1445 – Walbro GSS342 / AEM 50-1200 / 50-1220

• 20-1446 – Bosch BR540 / DeatschWerks DW400

• 20-1447 – Walbro F90000267 / 274 / 285 / 295

Included

• Radium MPFST-R surge tank with built-in RA-series regulator

• Pre-installed AN adapter fittings

• Stainless steel mounting hardware

• Internal wiring terminals

• Vacuum port fittings (barbed, 3AN, push-connect, plug)

• 1/8" NPT fuel pressure port plug

Vehicle Fitment
Universal fitment – ideal for custom fuel systems, high-boost street builds, and motorsport applications.