![]() The fuel line clears the OEM fuel pump cover and all suspension-related parts. The kit will come partially assembled as shown above. There will be enough components included with this option to run one or two surge tank fuel pumps.Ī -8AN PTFE fuel feed line secures to the FHST outlet, as shown below. Anodized Aluminum 8AN Male Outlet Fitting This system is suited, but not limited, to the following fuel pumps: If an extra fuel pump will be installed, purchase a Radium 17-0031 DIY Wiring Kit HERE. These kits include 1 relay, 1 fuse, and all associated wiring and hardware to install 1 surge tank pump. Furthermore, the in-tank wiring is insulated with high quality chemically resistant ETFE. Electrical hardware is included for the fuel pump(s) and OEM level sender. Nonconductive acorn nuts are provided to prevent any accidental short circuiting. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. The custom designed stainless electrical studs easily handle the high current demand that compact bulkhead connectors lack. But because the FHST eliminates the OEM post pump filter, a low micron filter will need to be purchased separately. To clear the OEM fuel pump cover plate, the 8AN ORB threaded feed port features a preinstalled low profile 8AN male fitting.Īs shown above, sock filters are used on the fuel pump inlets. Also, 2 fuel return orifices are included for fine-tuning the desired fuel pressure to the fuel pumps' flow rate. A 6-hole diverter evenly disperses fuel inside the canister preventing air bubbles and foaming. The returning low pressure fuel from the FPR is sent back into the FST canister keeping it full. Furthermore, if an intake manifold signal is installed, this FPR can operate at a 1:1 ratio permitting fuel pressure to proportionally increase with boost pressure. Like OEM, a fuel pressure regulator (FPR) is integrated into the unit. At this point, it is up to the lift pump and the FPR to supply the last few ounces of fuel to the FHST. No matter what is dynamically changing with the other 2 fuel sources, the high flowing 1-way valve will constantly supply fuel to the FHST canister until the LH side of the gas tank becomes extremely low. Unlike traditional surge tanks that rely heavily on surge tank pump and lift pump flow matching, the FHST uses an extra source that negates this important relationship. ![]() Fuel will then cycle back into the FHST through a 1-way valve integrated to the bottom of the FHST. When a low demand of fuel is present, the FHST canister will overflow back into the LH side of the OEM tank. This keeps the required pressure for the venturi jet pump(s) to be active and deliver fuel to the lift pump. The lift pump fills the FHST canister through a special orifice in the FHST. Note that the BMW fuel pump is still retained but is now repurposed as a "lift" pump to fill and maintain volume in the FHST. As described below, the FHST pump(s) are supplied with fuel from 3 different sources: the OEM electric "lift" pump, the fuel pressure regulator (FPR), and the integrated 1-way valve. The FHST is the best solution in preventing fuel starvation. When these BMWs experience high lateral Gs, they inherently suffer from fuel slosh. The post pump filter and FPR are integrated into the LH side of the tank where the FHST mounts. ![]() The venturi jet pump is driven by the feed line instead of the return (M3 has 2 venturi jet pumps). The OEM saddle bag fuel tank is quite complex. ![]() The system is E85 compatible and does not require any permanent modifications for installation. The stock fuel pump is used to pump fuel into the FHST, while the pumps inside the FHST then supply fuel to the engine. This system installs inside the BMW fuel tank on the opposite side of the factory fuel pump and can hold one or two high-flow aftermarket fuel pumps. The Radium Fuel Hanger Surge Tank is a revolutionary way to eliminate fuel starvation that can occur during high performance driving, while also providing a way to upgrade the fuel pumps for high-horsepower engine modifications. The Fuel Feed Kit is NOT compatible with the M3. This is not covered in the installation instructions and is up to the installer to devise a solution. NOTE: This system is compatible with the E90/92/93 M3 fuel tank, however the stock M3 fuel pump cannot be controlled with the factory fuel pump controller, advanced system modifications are required to overcome this issue. The Radium Engineering FHST (fuel hanger surge tank) is compatible with all BMW E90/92/93 3-series with the N54 or N55 engine. ![]()
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