Radium Dual Fuel Pump Hanger 08-21 Subaru STi - 20-0780-00

The Radium Engineering 20-0780-00 Fuel Pump Hanger for late-model Subaru applications replaces the factory in-tank unit and supports one or two high-flow pumps in the OEM tank for reliable fuel delivery on street and track. The drop-in assembly uses the stock gasket and quick-connect lines, adds a baffled collector box to reduce starvation, and is fully compatible with gasoline and E85.

This V2 hanger integrates a venturi jet pump with a pressure-relief valve to move fuel from the passive to the active side of the saddle tank without choking the return line. Internal pump merging to a single outlet, serviceable stainless electrical studs, and preinstalled SAE adapters keep the install clean while preserving the factory access cover.

For builds targeting higher flow, the hanger’s 8AN ORB outlet and 6AN ORB return/crossover ports make future -AN plumbing straightforward, while the included submersible hose and hardware simplify a stock-line install. The result is stable pressure under lateral load with fewer external parts to manage. When retaining the factory hard lines, an external fuel-hanger plumbing kit is not required because the outlet merges internally and SAE quick-connects are preinstalled.

Radium Engineering 20-0780-00 - Features

• Drop-in, no-permanent-mods hanger that reuses the OEM tank gasket and hold-down pattern for a clean, reversible install.
• Supports one or two pumps (Walbro GSS342 255 lph and AEM 50-1200 family; select AEM variants may require an external check valve).
• Anodized aluminum collector box with dual one-way fill valves flowing 355 LPH each (710 LPH total) to help reduce starvation during cornering.
• Integrated venturi jet pump with pressure relief valve maintains cross-tank transfer without creating excessive return-line backpressure.
• Preinstalled SAE quick-connect adapters for feed, return, and crossover allow plug-and-play reuse of factory hard lines.
• 8AN ORB outlet and 6AN ORB return and crossover ports for straightforward -AN plumbing upgrades.
• All returning fuel from the FPR return and crossover enters the collector box through a one-way duckbill valve to prevent back flow and reduce fuel spray noise.
• Low-profile, anti-rotation stainless bulkhead studs keep wiring beneath the OEM access cover; each pump has dedicated +/- posts and nonconductive acorn nuts to help prevent accidental short circuits.
• E85-compatible construction and submersible-rated tubing for alternative fuels.
• Internal pump outlets merge inside the hat to a single feed—no external Y-fitting required.

Radium Engineering 20-0780-00 - Fitment

• 2008-2014 Subaru Impreza
• 2008-2014 Subaru WRX
• 2008-2014 Subaru Impreza WRX STi
• 2015-2021 Subaru STi VA
• 2014-2018 Subaru Forester XT
• 2008-2014 Subaru Forester
• 2005-2009 Subaru Legacy
• 2005-2009 Subaru Outback

Compatibility Notes

• 2015-2021 Subaru WRX (FA20F): returnless system. Requires an aftermarket fuel pressure regulator and the 20-0850 fuel level sender adapter to adapt the OEM level sensor.
• 2014-2018 Subaru Forester XT: requires the 20-0850 fuel level sender adapter.

Frequently Asked Questions

Which fuel pumps fit this 20-0780-00 hanger?

This hanger accepts the Walbro GSS342 255 lph and AEM 50-1200 family form factor. Many installers also use AEM 50-1230 and 50-1235 in this configuration. Some AEM pump kits do not include an internal check valve; add an external check valve if your calibration or hot-soak restarts demand it.

Do I need to convert my lines to -AN to install this?

No. The preinstalled SAE quick-connect adapters for feed, return, and crossover allow reuse of the factory hard lines. If you plan to move to -AN later, the ports are ORB-threaded (8AN outlet; 6AN return/crossover) for an easy conversion.

How does the hanger help prevent fuel starvation?

An anodized collector box keeps fuel pooled around the pump inlets, fed by two one-way fill valves (355 LPH each). A venturi jet pump with an integrated PRV moves fuel from the passive to the active side of the saddle tank without creating excess backpressure in the return line.

What extra parts do FA20 WRX owners need?

Because the 2015–2021 WRX uses a returnless system, you need an external fuel pressure regulator and the 20-0850 fuel level sender adapter to retain gauge functionality.

Is the hanger compatible with E85, and do I still need a post-pump filter?

The assembly is compatible with E85 and includes submersible-rated tubing. You should still run a proper post-pump EFI filter to protect injectors whether you retain stock lines or convert to -AN.

Install Notes

• Depressurize the fuel system and disconnect the battery before service; work with minimal fuel in the tank.
• Remove the rear seat and access cover; note the routing of the three quick-connect lines before disconnecting and clean the area to prevent debris entry.
• Reuse the OEM tank gasket in the correct orientation and tighten the eight M5 nuts evenly; the assembly is spring-loaded—start all nuts by hand.
• WRX (2015–2021) and Forester XT (2014–2018): install the 20-0850 level sender adapter; plan external FPR plumbing for WRX.
• For dual pumps or high current, upgrade feed wiring and relays.

Package Contents

• Anodized and laser-engraved fuel hat assembly
• Collector box with two one-way fill valves
• Integrated venturi jet pump with pressure relief valve
• Stainless electrical studs, terminals, and hardware
• SAE quick-connect adapters (feed, return, crossover)
• Submersible fuel tubing and installation hardware

Fuel pumps not included.

Warranty

Radium Engineering provides a 1-year limited warranty to the original purchaser covering defects in materials and workmanship. This warranty covers repair or replacement of the product and does not cover improper installation, misuse, or non-Radium components.