![]() ![]() This is an excellent fueling solution for vehicles installing large demand power upgrades such as forced induction. The surge tank also provides a quick and easy way to upgade any standard fuel system with a compact size. Excess fuel in the surge tank is returned back to the vehicle's main fuel tank. This volume is maintained by the main fuel tank's 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 pumps feed the fuel rail(s). A 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.Fuel Surge Tank (20-0952) by Radium®. 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. If supplying your own pumps, select the option "Pumps Not Included" from the menu.ġ. When purchasing "No Pumps Included", the kit will come preassembled as shown above.Ģ. Stainless Electrical and Mounting Hardware 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 All of this happens inside the OEM gas tank. A second 24 hole deflector is used in this location further preventing air bubbles and foaming. The returning low pressure fuel from the regulator is sent back into the FST keeping it full. When a low demand for fuel is present, the canister will overflow back into the OEM sub tank.įor the high pressure pumps supplying fuel to the engine, a bespoke stainless steel triple pump mesh strainer is included for proper inlet filtration.īecause all compatible fuel pumps utilize integrated check valves, the high pressure pump outlets merge into a single 10AN billet collector. 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. The 1" check ball allows fuel into this tight area during acceleration (above) and traps fuel in during deceleration (below). Measures were taken to ensure that the lift pump always has fuel to deliver to the surge tank. 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. Fortunately, Mazda manufactured a gas tank with a very large bolt flange pattern (similar to the FCST) permitting various upgrading options.įor a proper FST to function, a lift pump is necessary to maintain volume within the surge tank. 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. Electrical hardware is included for the fuel pump(s), OEM level sender, and OEM temperature sensor.Ī fuel surge tank (FST) is the best solution in preventing fuel starvation. Since 2009, Radium Engineering has been designing numerous FSTs for multiple applications. 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. To reconnect the OEM feed and return hoses, barb fittings are also included. To simplify aftermarket -AN hose plumbing, the 10AN ORB threaded feed port features a low profile 8AN male fitting and the 8AN ORB threaded return port features a low profile 6AN male fitting. This system is compatible with the following fuel pumps: No grinding, bending, or modification of the trunk floor sheet metal is required. The unique integrated 1.85L surge tank completely eliminates fuel starvation. The Radium Engineering fuel surge tank hanger permits the use of 1, 2, or 3 aftermarket high pressure pumps and 1 lift pump in the stock Mazda FD RX7 fuel tank. ![]()
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