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. Three 6AN male fittings (8AN can be purchased separately HERE) 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 Need help selecting a fuel pump configuration for your vehicle? CLICK HERE for a unbiased test of popular fuel pumps. 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). SEE TERMS AND CONDITIONS FOR MORE INFORMATION.Ī fuel surge tank (FST) is designed to prevent fuel starvation to the engine on vehicles with inadequate fuel tank baffling. Because this kit includes a bespoke fuel pump inlet screen, the sock filters that typically come standard with these types of pumps are not required.RADIUM DOES NOT OFFER A WARRANTY ON ANY FUEL PUMPS! FUEL PUMPS CAN BE RETURNED IN UNUSED CONDITION WITHIN 30 DAYS OF PURCHASE. Depending on the setup, some parts will simply not be used.ģ. There will be enough components included with this option to run all 4 fuel pumps. Stainless Electrical and Mounting Hardwareġ. When purchasing "No Pumps Included", the kit will come preassembled as shown above.Ģ. Anodized Aluminum Lift Pump Baffle and Check Ball Anodized Aluminum 8.5mm Barb Hose Ends for OEM Feed/Return Anodized Aluminum 6AN Male Fitting for Return Anodized Aluminum 8AN Male Fitting for Feed Permits 1-3 Surge Pumps plus 1 Lift Pump This system is compatible with the following fuel pumps( not included on this particular variation )į90000274 (450/460lph High Pressure E85/Pump Gas )į90000285 ( 525lph E85/Pump gas " Hellcat" ) Measures were taken to ensure that the lift pump always has fuel to deliver to the surge tank.īecause all compatible fuel pumps utilize integrated check valves, the high pressure pump outlets merge into a single 10AN billet collector. It also serves as a baffle keeping the lift pump supplied with fuel. Included in the kit is a lift pump mount that snaps onto 3 sides of the OEM sub tank. This lift pump is located in the rear portion of the OEM sub tank within the Mazda gas tank. The 1" check ball allows fuel into this tight area during acceleration and traps fuel in during deceleration.įor the high pressure pumps supplying fuel to the engine, a bespoke stainless steel triple pump mesh strainer is included for proper inlet filtration.įor a proper FST to function, a lift pump is necessary to maintain volume within the surge tank. When a low demand for fuel is present, the canister will overflow back into the OEM sub tank The 24 hole diverter evenly disperses fuel inside the canister preventing air bubbles and foaming. The lift pump sends low pressure (high volume) fuel in the FST through a special deflector in the bottom of the surge tank canister. Electrical hardware is included for the fuel pump(s), OEM level sender, and OEM temperature sensor. Furthermore, the high quality in-tank wiring is insulated with chemically resistant PTFE. Nylon acorn nuts are provided to prevent any accidental short circuits. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. The custom designed stainless electrical studs easily handles the high current demand that compact bulkhead connectors lack. Fortunately, Mazda manufactured a gas tank with a very large bolt flange pattern (similar to the FCST) permitting various upgrading options. But after some sanctioning bodies banned externally mounted FSTs, Radium built the first production fuel cell with an integrated surge tank (FCST). Because the FD RX7 can experience high lateral Gs, it inherently suffers from fuel slosh. A fuel surge tank (FST) is the best solution in preventing fuel starvation. Since 2009, Radium Engineering has been designing numerous FSTs for multiple applications.
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