The Radium fuel pump hanger for the late model Subaru vehicles replaces the stock in-tank hanger and allows the use of 1 or 2 high-flow aftermarket fuel pumps in the stock fuel tank. No permanent modifications to the vehicle are required making installation a simple bolt-on job. Each fuel pump has it’s own dedicated 6AN male outlet, which can be combined together into single feed line with the use of a “Y” fitting, or with one of the plumbing kit options on this page. The return fuel and crossover fittings are also 6AN male. The system is safe to use with alternative fuels such as E85.
The machined assembly mounts in the factory fuel tank using the OEM hold-down flange and gasket. The OEM fuel level sender and temperature sensor (if equipped) are retained. Unlike compact multi-pin electrical connectors, the custom designed stainless steel electrical studs easily handle the high current demand from aftermarket fuel pumps. These serviceable connections are hermetically sealed and impervious to all standard and exotic fuels. The low profile design keeps all wiring tucked nicely underneath the OEM cover plate. Nonconductive acorn nuts are provided to prevent any accidental short circuits. Crimp-on ring terminals and heat shrink are provided for external wiring connections.
Preventing Fuel Starvation
The kit includes a venturi jet pump integrated within the collector box that features a new integrated pressure relief valve. This device transfers fuel from the passive side of the OEM fuel tank to the active side where the pump(s) reside. When fuel pump flow is increased, the OEM jet pump becomes too restrictive creating unwanted backpressure in the FPR return line causing excessive fuel rail pressure. The unique design of the Radium jet pump creates suction while not providing too much restriction in fuel return line. The anodized aluminum collector box keeps fuel trapped around the pumps, helping to prevent fuel starvation. There is a 1″ check valve incorporated on the front side of the tank that serves as a trap door that allows fuel in but not out of the collector box. Furthermore, all returning fuel from the pressure regulator return and the crossover hose enter the collector box through a one-way duckbill valve keeping it full. The duckbill valve prevents back flow and reduces noise from fuel spray. The collector box also permits a mounting solution for the OEM fuel level sender. The 2015+ WRX requires Radium 20-0350 Fuel Level Sender Adapter.
Available Fuel Pump Hanger Configurations:
- No Pre-installed pumps – Select this option if you already have compatible fuel pumps and wish to install them into the hanger. Enough parts are included to install one or two pumps. To ensure proper parts included, make sure the correct hanger is selected for the model of pump you have.
- Single Pump Included – Select this option if you wish to only run a single pump in the hanger. It will come pre-assembled with the pump installed. Parts to add a second pump are NOT included with this setup.
- Dual Pumps Included – Select this option for a fully assembled hanger with both pumps preinstalled.
Included in all Configurations
- Billet aluminum top plate, anodized and laser engraved
- Fully enclosed collector box with one-way check valve
- Electrical terminals for the wire connections
- Stainless steel hardware
- AN fuel line connections
- Submersible fuel hose
Note: Single pump applications can reuse the OEM fuel pump controller wiring, but it is recommended to upgrade the OEM wiring as high flow fuel pumps draw additional current requiring larger gauge wire.
Note: When using two pumps, it is highly recommended to stage the second pump to only come on when needed, such as under boost. This can be done with a programmable engine management system or with a pressure switch. Each pump has it’s own dedicated +/- electrical connections.
Note: The factory level sender and fuel temperature sensor are re-used. Consult the installation for more details.
Note: If supplying your own pumps, you must use a flexible fuel pump filter sock like the Radium 14-0143. These style fuel socks also come standard with new AEM fuel pumps.
