RAD20-0978
You can order this item even if it's currently out of stock, and we will ship it to you as soon as it becomes available.
Contact our sales team at sales@atcracinggroup.com or text/call 321-804-1101 for additional info.
This fuel plumbing kit compliments a Radium fuel rail installation on Subaru EJ engines. It plumbs the fuel rails in series and uses Radium's unique direct mount regulator. Includes all fittings and lines and interfaces with the factory feed and return pipes. E85 compatible.
FUEL RAIL PLUMBING KIT, SUBARU EJ, SERIES
COMPATIBILITY
Subaru EJ2X Engines
For early vehicles with an engine bay mounted fuel filter, consult the installation instructions.
OVERVIEW
This fuel rail plumbing kit interfaces with the factory hard lines near the LH strut tower using SAE quick connects or older hose barb connections. A DMR-RA regulator and a 0-100psi fuel pressure gauge are included.
The fuel pressure gauge can be installed at any of the 6AN junctions before the regulator using the included adapter. The 6AN swivel fuel rail fittings are low profile making them ideal for the tight spaces associated with the EJ motor. The variety of reuseable PushLok hose ends permit customizing (such as adding a flex fuel sensor) making installation quick and painless.
The included 6AN fuel hose can be cut with standard tools and assembled without special skills.
Click here to download installation instructions (PDF)
These plumbing kits are designed to compliment Radium Engineering Subaru EJ fuel rail installations. Both kits interface with the factory feed and return hard lines in the engine bay (near the LH strut tower) and provide all the underhood fuel plumbing. Both kits are compatible with all Radium Fuel Rails for the Subaru EJ engines (excluding 20-0499 Fuel Rails). All necessary fittings and hoses are included, along with a RA-Series FPR.
RA-series regulators feature the first tool-less pressure adjustment. A jam nut and set screw are no longer required. With a simple turn of the knob, pressure will be increased or decreased. 
To aid in adjusting pressure, there are incremental detents that provide haptic feedback to the user. Every detent permits 1psi (+/-0.5psi) of adjustment depending on current fuel pressure. Furthermore, RA-series regulators feature a 360 degree swiveling vacuum reference port that is double O-ring sealed. This is the first in the industry. It permits the installer to quickly point the vacuum fitting in any direction with no tools required.
There are 4 interchangeable 10-32 threaded vacuum port fittings provided to cover all scenarios.
1. Barbed Fitting: A black zinc-plated 3/16" (5mm) barb machined from high strength steel that is compatible with the following vacuum hoses: 5/32" (4mm), 3/16" (5mm), and 7/32" (6mm).
2. 3AN Male Fitting: A black zinc-plated adapter machined from high strength steel that is compatible with 3AN hose ends.
3. Push-To-Connect: A nickel-plated brass fitting with Buna-N O-rings that is compatible with hard plastic 1/4" OD tubing.
4. Vacuum Plug: A black oxide stainless steel screw that is used to maintain a constant (non dynamic) fuel pressure.
Two kits are offered; one that feeds the fuel rails in series, and another that feed the fuel rails in a parallel configuration. Both kits perform equally well. The end decision is based on personal preference. Scroll down for details on each kit.
IMPORTANT NOTES
1. Neither kit includes a fuel filter.
2. Neither kit is compatible with Radium dual port injector fuel rail kit 20-0499.
3. Both kits are safe to use with alcohol fuels such as methanol, ethanol, E85 etc.
4. Both kits use 3/8" (6AN) high pressure EFI fuel hose.
Our little 1990 Mitsubishi Minicab Time Attack build was a hit at the Toyo Treadpass at SEMA 2023! We are overwhelmed at the response! Soon, this Kei Truck will be equipped with a Turbo Hayabusa motor and ready to rip!
Check out Larry Chen's SEMA rundown of the build at the link.