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 CLICK HERE for a video on how a Radium fuel surge tank works.


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.


-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
-Nickel-Plated Electrical Connector with 24" Flying Leads
-Assembled with stainless steel hardware 
-Three 6AN male fittings 
-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.  Additional details on the design of the FST-R can be found here.

The FST-R can be configured with all 39mm fuel pumps from many leading manufacturers. 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.

The Ti Automotive E5LM brushless pump requires a fuel controller to operate. Some OEM vehicles such as BMW, Buggatti, etc. use brushless pumps and their OEM controllers may work for the E5LM pump. Also, there are aftermarket companies that make brushless packages such as AMS Performance, SRM, etc. Check availability first before ordering. 

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.

Two interchangeable orifices are included with calculated flow diameters to match the fuel pump flow to the regulator. Furthermore, this added precision will resist diaphragm flutter and optimize pressure stability.

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. 

2017-19 F150 Raptor Radium Engineering Fuel System Upgrade Kit

  • Click here to download installation instructions (PDF)

    This comprehensive installation kit includes everything needed to install a Radium fuel surge tank (FST-R) in a 2017+ F150 Raptor EcoBoost. The required FST-R is sold separately. To select a FST-R surge tank, visit THIS PAGE. Some of the pumps available outflow the OEM Ford Raptor fuel pump by more than 23%.

    The OEM fuel pump is repurposed to keep the surge tank full with excess returning back to the OEM fuel tank. The new FST-R pump will now feed the engine and is regulated by the integrated FPR on the surge tank. This pump keeps supplying fuel, even if the OEM fuel pump becomes momentarily starved.

    A Radium gauge is included to adjust and monitor fuel pressure. The integrated regulator on the FST can be vacuum referenced if 1:1 fuel pressure is required or ran static (no vacuum reference) to mimic the stock system.

    The Ford F150 Raptor install kit locates the FST-R in a collision-safe area under the LH side of the truck. The polished stainless steel bracket solidly mounts to OEM mounting points.

    Also included are wiring components with flying leads featuring Raychem solderless butt splices, and a weatherproof fuse and relay to drive the FST-R fuel pump. Wiring is very simple and takes less than 30 minutes to assemble. No soldering is required.

    What is Included?
    -Stainless Steel F150 Raptor FST Mount
    -Fuel Pressure Gauge
    -Aluminum Push Lok -6AN Hose Ends
    -AN and OEM Style Adapter Fittings
    -Vapor Shield 3/8" (-6AN) EFI Hose
    -Wiring Components with Relay and Fuse
    -Stainless Steel Hardware

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