The side port is the regulated pressure output and is plumbed directly to the fuel rail(s). If the pump is purchased elsewhere, some assembly will be required. 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. Note: The FST-R is not available in dual-pump configurations. The FST-R can be configured with all 39mm fuel pumps from many leading manufacturers. Like all Radium fuel surge tanks, this universal product can be used on any fuel injected application and is compatible with all fuel types. Furthermore, this system permits cooler fuel temperatures as the fuel is not returning from the hot engine bay. This simplifies the installation, reduces overall cost, reduces weight, and eliminates potential leak points in the fuel system. This revolutionary idea eliminates the need for an external fuel pressure regulator along with the extra fittings and hoses. The high-flow regulator is adjustable and features interchangeable orifice sizes. 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. Assembled with stainless steel hardware.Nickel-Plated Electrical Connector with 24″ Flying Leads.Interchangeable regulator orifice sizes to match output of different pumps.Integrated adjustable fuel pressure regulator with 1:1 vacuum reference.Anodized for compatibility with all fuel types.Full CNC aluminum construction with O-ring sealed interfaces.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. Excess fuel in the surge tank is returned back to the vehicle’s main fuel tank. In the case of the FST-R, the regulator is built in to the surge tank and is recirculating fuel internally. This volume is maintained by the main fuel tank’s (lift) pump as well as the fuel returning from the fuel pressure regulator. The volume of fuel inside the surge tank acts as a buffer to always keep the FST pump supplied with fuel. The FST fuel pump feeds the fuel rail(s). This is noted in the instruction manual.A fuel surge tank (FST) is designed to prevent fuel starvation to the engine on vehicles with inadequate fuel tank baffling. To alleviate this issue, the OEM venturi jet pump in the return port can be modified to alleviate the restriction and promote fuel flow back into the OEM fuel tank. Lastly, due to the restrictive return port on the OEM fuel pump housing, a slightly higher static fuel pressure is normal when using a high flow pump. Included are four -6AN PTFE hoses which are cut to length and preassembled. Wiring is very simple and takes less than 30 minutes to assemble. The FST with black anodized bracket is isolated through the OEM carpet cover (shown below) to reduce fuel pump noise and vibration.Īlso included are wiring components with flying leads featuring Raychem solderless butt splices, and a weatherproof fuse and relay to drive the FST's fuel pump. The aluminum bracket solidly mounts to the V-brace in front of the rear seat carpet cover in the trunk. This allows for the majority of the trunk space to still be useable. The Mitsubishi Evolution 8-9 install kit locates the FST in a collision-safe area of the trunk, centered behind the rear seat (shown below without carpet installed). to make them alcohol (ethanol/methanol/E85) compliant. They are fully anodized and use PTFE insulated wiring, submersible hose, etc. Here is a informative video on how a Radium Fuel Surge Tank (FST) works:Īll Radium FSTs are CNC machined from aluminum. The kit was not designed to work with the Radium MPFST. To purchase the physical Radium Engineering FST, click HERE. This comprehensive installation kit includes everything needed to install a Radium fuel surge tank with a single 39mm fuel pump in a Mitsubishi Lancer Evolution 8-9.
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