Radium Fuel Rail Plumbing Kit w/Filter - Subaru WRX / STI / Forester XT / Liberty GT

Suits:

• 2008-2014 Subaru WRX
• 2008-2014 Subaru STI
• 2015-2021 Subaru STI
• 2008-2013 Subaru Forester XT
• 2004-2009 Subaru Liberty GT

The Radium Engineering Fuel Rail Plumbing Kit provides the complete post-pump filtration and fuel line solution required when using the Radium Engineering fuel pump hanger on Subaru EJ-platform vehicles. An 8AN PTFE feed line routes from the Radium hanger to a Radium fuel filter mounted under the vehicle, with an 8AN rubber hose continuing to the fuel rails. A 6AN rubber return hose routes fuel from the fuel pressure regulator back to the hanger.

Billet aluminium retainers are included to secure all fuel lines. The filter bracket mounts to the chassis with no drilling or permanent modifications required.

Note: Aftermarket fuel rails and a fuel pressure regulator are recommended.

Kit Contents

• Radium fuel filter (Stainless or Microglass — see variant selection)
• 8AN PTFE feed line (hanger to filter)
• 8AN rubber hose (filter to fuel rails)
• 6AN rubber return hose (FPR to hanger)
• Billet aluminium fuel line retainers
• Filter chassis mounting bracket
• AN adapter fittings and hardware

Filter Options

• Stainless — Stainless steel filter element. Cleanable and reusable. Ideal for high-flow E85 and flex fuel builds.
• Microglass — Microglass filter element. Superior filtration efficiency for fine particulate capture.

Note: The only difference between the two kits is the filter element type.

Available Part Numbers

• 20-0629-03 — Radium Fuel Rail Plumbing Kit w/Filter, Subaru WRX/STI/FXT/LGT (Stainless Filter)
• 20-0629-05 — Radium Fuel Rail Plumbing Kit w/Filter, Subaru WRX/STI/FXT/LGT (Microglass Filter)

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ CNC-machined billet aluminium components built for performance and longevity
• ✅ Trusted by high-power build tuners and race teams worldwide
• ✅ Bolt-on fitment — no cutting, drilling, or fabrication required
• ✅ Compatible with E85, pump petrol, and flex fuel sensor integration