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Radium Engineering E46/M3 Catch Can KitRadium Engineering Multi-Pump Fuel Surge Tank

Radium Engineering FST-R Fuel Surge Tank with Integrated FPR
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Radium Engineering FST-R Fuel Surge Tank with Integrated FPR

Price: $629.00
You Save: $31.45

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A fuel surge tank (FST) is designed to prevent fuel starvation to the engine on vehicles with inadequate fuel tank baffling. The FST fuel pump feeds the fuel rail(s). The volume of fuel inside the surge tank acts as a buffer to always keep the FST pump supplied with fuel. This volume is maintained by the main fuel tank's (lift) pump as well as the fuel returning from the fuel pressure regulator. In the case of the FST-R, the regulator is built in to the surge tank and is recirculating fuel internally. Excess fuel in the surge tank is returned back to the vehicle's main fuel tank.
Installing a surge tank is also an easy way to upgrade the fuel pump of a vehicle without opening or modifying the OEM fuel tank.

Need help selecting a fuel pump configuration for your vehicle? CLICK HERE for a unbiased test of popular fuel pumps.

Features of the RADIUM FST-R Fuel Surge Tank:

-Full CNC aluminum construction with O-ring sealed interfaces 
-Anodized for compatibility with all fuel types
-Integrated adjustable fuel pressure regulator with 1:1 vacuum reference
-Interchangeable regulator orifice sizes to match output of different pumps
-High quality nickel plated sealed electrical bulkhead connector
-Assembled with stainless steel hardware 
-6AN male hose connections
-Fully assembled and leak tested before shipment
-Lifetime warranty on Radium components (excludes fuel pump, hoses and fittings)


The FST-R (Fuel Surge Tank–Regulated) is an all new design that houses a single internal fuel pump and has an integrated fuel pressure regulator machined into the top cap. The high-flow regulator is adjustable and features interchangeable orifice sizes. This revolutionary idea eliminates the need for an external fuel pressure regulator along with the extra fittings and hoses. This simplifies the installation, reduces overall cost, reduces weight, and eliminates potential leak points in the fuel system. Furthermore, this system permits cooler fuel temperatures as the fuel is not returning from the hot engine bay. Like all Radium fuel surge tanks, this universal product can be used on any fuel injected application and is compatible with all fuel types. 

The FST-R can be configured with fuel pumps from many leading manufacturers, including Walbro, AEM, Aeromotive, and Deatschwerks. Note: The FST-R is not available in dual-pump configurations. If the pump is purchased as part of the FST-R, the surge tank will come fully assembled and will be pressure tested for leaks and ready to be installed. If the pump is purchased elsewhere, some assembly will be required.

Please see the More Details tab on this page (above) for additional info on plumbing a FST-R.

The side port is the regulated pressure output and is plumbed directly to the fuel rail(s). No additional fuel pressure regulator is required. Pressure adjustment is done using the adjustment screw located on the top cap of the regulator unit. A vacuum line hooks up to the nipple on the FST-R to achieve 1:1 vacuum reference. Note: returnless fuel systems commonly use a constant fuel pressure. In this case, the vacuum reference hose is not required.

The FST-R is no taller than a standard fuel surge tank with hoses installed.

The FST-R comes fully assembled with the correct orifice size for the selected pump. However, should orifice size need to change it can be done easily using common tools. Two additional sizes are included.

A fuel pressure gauge is needed in order to set and monitor fuel pressure and should be located along on the output line or at the fuel rail. The Radium universal fuel pressure gauge is perfect for this duty. Shown above is the gauge with the optional in-line Tee fitting.


The fuel surge tank can be mounted near the main fuel tank or in the engine bay. Mounting locations near heat sources or moving parts such as suspension components should be avoided. It should also be mounted away from common collision areas. 
Choose a bracket below that best fits your mounting needs.

Floor and Wall Mount - This bracket is laser cut from aluminum and powder coated black and can be mounted on the side or bottom of the surge tank.

Frame Mount - Because this bracket has a 90deg formed bend and is cantilevered, it is constructed from steel for superior strength. It is not only nickel plated to resist corrosion, it also allows for components to be grounded to the spare hole in the bracket. This assumes the bracket is mounted to an electrically conductive material such as a steel frame.

Angled Mount - This mounting bracket is used for vehicles that may have a limited mounting height. It can be mounted on a floor and against a wall. This bracket is made from laser cut aluminum and powder coated black.


A flying lead harness is included with the FST-R. An optional universal fully populated wiring harness is available for an additional cost.  You can purchase the harness Here.


**Please select the options you want below**


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