![]() 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. The pump feeding the engine, then draws it's fuel from the surge tank, with excess returning from the regulator back to the surge tank.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. Excess fuel is then routed back to the OEM fuel tank or fuel cell. A mounting bracket is not needed with the HVFST.Īll external pump fuel surge tanks require a "lift pump" to supply them with fuel. It must be mounted as near vertical as possible. The High Volume fuel surge tank (HVFST) is an ideal option for very high flow external fuel pumps requiring a large reservoir and feed line. Radium does not recommend mounting this surge tank horizontally, as the pick-up may be prone to drawing in air pockets. This surge tank is most effective when mounted vertically, however it can be tipped up to a 45 degree angle. Thus, this FST model does not include a bulkhead wiring adapter so it is not suited to be used with a fuel pump inside of it. It features a single or dual anodized aluminum pick-up tubes rather than an integrated internal fuel pump. It provides a reservoir from which an external pump can draw from. *FST for External Fuel Pumps* Radium Engineering "pumpless" FSTs were designed for users that already have a secondary external fuel pump. * Lifetime Warranty on all Radium components * Factory Pressure Tested Before Shipment * -6AN Feed and Return Fittings (High Volume FST uses -8AN) * Removeable O-Ring Sealed Billet 6061 Aluminum Caps * Extruded and Machined 6061 Aluminum 1.5 Liter Canister ![]() 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 pump(s) 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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