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Radium Fuel Surge Tank with Regulator (FSTR)




The Radium Fuel Surge Tank (FST-R) includes an integrated fuel pressure Regulator built in to the tank and recirculates fuel internally by s "Dead End" system. Fuel does not return from the engine/fuel rail. Excess fuel in the surge tank is returned back to the vehicle's main fuel tank. The FST-R uses only one fuel pump. Pumps and install options are sold separately, linked below.

Vehicle Fitment:
• Universal Application

Install Instructions:
Download PDF

Full Description:
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.

The FST-R 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 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: return-less fuel systems commonly use a constant fuel pressure. In this case, the vacuum reference hose is not required.

Features: (Each kit will be different)
• 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

Install Notes:
The fuel system plumbing using the FST-R is not a "return" type system. It is considered a "dead end" system. This is because fuel does not return from the engine/fuel rail. This is common practice on many modern OEM vehicles. It prevents warm fuel from returning to the gas tank and heating the entire fuel system.

Radium Engineering has not experienced fuel flow problems using "dead end" systems, even on very high horsepower applications.


Fuel Pressure Gauge with -6AN Inline Adapter:
Radium 20-0152 (Sold separately)

FST-R Fuel Pump Options (Sold Separately)

Fuel Pump Use With
GSS342 Gas
F90000267 Gas / E85
F90000274 Gas / E85
F90000285 Gas / E85
AEM 50-1200 Gas / E85
AEM 50-1000 Gas

FST-R Mounting Options (Sold Separately)

Universal Install Options:
Part Number: Style:
13-0054 Wall/Floor Standard Mount
13-0011 Frame Rail Mount
13-0029 Angled Mount
Vehicle Specific Install Options:
Part Number: Description:
20-0114 S2000 2006-2009 Install Kit
20-0487 F150 Raptor Install Kit
20-0365 Focus RS/ST Install Kit
Universal Wiring Harness:(For Single Pump ONLY)
Part Number: Description:
17-0024-00 Radium FST Fully Populated Wiring Harness

© All content is property of STM Tuned Inc
We price match!
If you find it cheaper, just give us a call!
(585) 226-8226

© All content is property of STM Tuned Inc

We price match!
If you find it cheaper, just give us a call!
(585) 226-8226

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