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. This warranty does not extend to third party products often used in Radium Engineering products, such as fuel pumps, turbochargers, or any other non-Radium brand products.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. Credit for defective products will be issued pending inspection by Radium. Improper use, installation, modification, abuse, or unauthorized repairs or alterations voids this warranty. This warranty applies to the original purchaser only and is non-transferrable. Radium will not be held responsible for secondary or consequential damages or costs (including labor, towing, etc.) incurred due to failure of this product This warranty is limited to repair or replacement of the merchandise only and shall not, in no event, exceed the original purchase price. If a product fails, it will be repaired or replaced at Radium option when it has been determined by Radium to have failed due to defects in materials or workmanship. Warranty claims must be made by the original purchaser. Each pump has a dedicated vapor shield hose that draws fuel from the bottom of the FST.Īll Radium brand products are subject to a 1 Year Limited Warranty from the date of original purchase. Unlike others on the market, these clamps conductively transfer the fuel pumps thermal energy to the chassis increasing fuel pump longevity. The anodized 6061 billet aluminum clamps and FST mount directly to the powder coated aluminum plate using stainless countersink bolts. Both of these dual-pump configurations are ideal for high powered V or H configured engines with dual fuel rails. 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.
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