Part #: 20 - 0584. The Radium Engineering plumbing kits are a great addition to Radium Engineering Subaru EJ fuel rail installations. This kit connects with the factory feed and return hard lines in the engine bay (near the LH strut tower) and provides all the under - hood fuel plumbing. It comes with all necessary fittings, hoses, and an adjustable high - flow fuel pressure regulator. There are two kit options: one for series - fed fuel rails and another for parallel - fed fuel rails, both performing equally well. Your choice depends on personal preference. Both kits work with all Radium Fuel Rails for Subaru EJ engines (except 20 - 0499 Fuel Rails). Important Notes: 1. The kit doesn't include a fuel filter. 2. It's not compatible with Radium dual port injector fuel rail kit 20 - 0499. 3. It's safe to use with alcohol fuels like methanol, ethanol, E85 etc. 4. It uses 3/8' (6AN) high - pressure EFI fuel hose. The parallel fuel rail plumbing kit, due to the regulator mounting location and OEM fuel filter placement, is only for the 2008+ Impreza (WRX/STi) and Forester platform. The parallel kit is ideal for tidying up the engine bay as hoses and fittings are consolidated. Each fuel rail gets fed as shown in the photo. The feed and return lines enter the Radium Multi - Port Regulator (MPR) from the rear and go out through the front to the fuel rails. The regulator attaches to the LH strut tower using the provided stainless - steel mounting bracket. A Radium 0 - 100psi fuel pressure gauge is included for calibration. Fittings and 6AN hose are provided to connect with the OEM feed and return hard lines. If you've replaced the factory piping with aftermarket - AN hoses/lines, this kit can still be used (contact us for details).
Using this Radium Engineering fuel rail plumbing kit is straightforward. First, find the factory feed and return hard lines in the engine bay near the LH strut tower and connect the kit to them. You'll use the included fittings and 3/8' (6AN) high - pressure EFI fuel hose for the connections. Attach the adjustable high - flow fuel pressure regulator to the LH strut tower with the provided stainless - steel mounting bracket. Then, use the Radium 0 - 100psi fuel pressure gauge to calibrate. When it comes to choosing between the series - fed and parallel - fed options, it's up to you. Just remember, this kit doesn't come with a fuel filter, and it won't work with the Radium dual port injector fuel rail kit 20 - 0499. Also, it's safe to use with alcohol fuels. For maintenance, regularly check the fittings and hoses for any signs of wear or leaks. If you've replaced the factory piping with aftermarket parts, you can still use this kit, but reach out to us for more details on how to make it work.
