A fuel surge tank (FST) is designed to prevent fuel starvation to the engine on vehicles with inadequate fuel tank baffling. Go HERE for more filter element information.Fuel Surge Tank by Radium®. Depending on the kit selected (-01,-03, -05), the fuel filter will be assembled with 1 of 3 different elements. The filter is mounted through a Radium Engineering heat exchanger to keep fuel temperatures down. The included Radium Engineering fuel filter assembly mounts to the rear subframe underneath the vehicle using a specifically designed FD RX7 bolt-on billet mount. No cutting or drilling is required to get the feed line past the fuel tank. The fuel lines clear the OEM fuel pump cover and all suspension related parts. The feed kits use high flowing -8AN fuel lines.Ī Radium 1/2" fuel/PCV feed hose runs from the fuel pump hanger outlet to a Radium Engineering fuel filter secured to the rear subframe. From there a pre-made -8AN PTFE feed line runs all the way to the engine bay where it is up to the user to adapt the 45 degree hose end to their specific fuel system. For the 20-0951 brushless fuel pump hanger (shown above), the lift pump wire harness and tubing provided is compatible with Walbro DCSS 39/50 pumps (F90000267/274/285/295). Depending on the setup, some parts will simply not be used.Ĥ. There are enough components included to run all 4 fuel pumps. Final assembly is performed by the installer.ģ. Stainless Electrical and Mounting Hardwareġ. The installer must provide their own fuel pumps.Ģ. The kits will come preassembled as shown below. 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. Pre pump filters are included for proper inlet filtration.īecause all compatible fuel pumps utilize check valves, the high pressure pump outlets merge into a single 10AN billet collector. 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. 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. 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. Furthermore, the high quality in-tank wiring is insulated with chemically resistant ETFE. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. Nonconductive acorn nuts are provided to prevent any accidental short circuits. The custom designed stainless electrical studs easily handle 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 (sold separately): 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. Click here to watch an independent installation video
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