COMPATIBILITYBMW E90 3-series (N54 or N55)BMW E91 3-series (N54 or N55)BMW E92 3-series (N54 or N55)BMW E93 3-series (N54 or N55)NOTE: This system is also compatible with the E90/91/92/93 M3 fuel tank. However, because the M3 uses a brushless fuel pump, the installer must devise a solution for triggering the new surge tank fuel pump(s). This is not covered in the installation instructions. Overview 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. 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 OEM fuel pump is used to pump fuel into the FHST, while the pumps inside the FHST supply fuel to the engine. The system is E85 compatible and does not require any permanent modifications for installation. Read below to see how the FHST works. Pump Configuration Kit come partially assembled. There will be enough components included to run one or two surge tank fuel pumps. P/N: 20-1972 is compatible with the following fuel pumps: Walbro F90000267Walbro F90000274Walbro F90000285 Features-Drop-In OEM Replacement-Permits 1 or 2 Surge Pumps -1: 1 Fuel Pressure Adjustments-Fuel Starvation Protection-Integrated 1-Way Fill Valve-High Current Electrical Hardware-Compatible with Various Pumps-Anodized Aluminum Construction-Gasoline and Ethanol Compliant-Anodized Aluminum 8AN Male Outlet Fitting-Anodized Aluminum Surge Tank Canister-Fuel Resistant Tubing and Wiring-Stainless Steel Hardware-Relay(s) and Fuse(s) PUMPS NOT INCLUDED Instruction PDF