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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