CJM S1 Fuel System, 13B-REW


The CJ Motorsports S1 fuel system, originally released in 2006, has remained the premium and most complete solution for the FD RX7 ever since. With countless updates through the years, we have continually made improvements and added options to keep it on top.

This is a total upgrade kit for all engine bay fuel system components utilizing a parallel plumbing configuration for the rails. This kit is compatible with factory or aftermarket lower intake manifolds, and available with a 2 or 4 injector secondary rail.

The foundation of this system is based on our completely billet machined secondary rail. This rail is fueled by the included -6an feed line which fastens to the factory 5/16" feed pipe and a -6/-8AN reducer in the back of the secondary rail. The rail features a -8AN inlet port to accommodate future upgrades. Integrated to the secondary rail is a Y-Block to provide fuel for the primary rail.

Our primary rail features -6AN inlet and outlet fittings. Fuel exiting the front of either rail via included PTFE hoses will lead to the adjustable pressure regulator affixed to the upper intake manifold with the CJM laser-cut stainless regulator mount.

Select your secondary rail with 2 fuel injector ports for use with the factory 13B-REW lower intake manifold, or 4 injector ports for an aftermarket LIM. Our 2-port secondary is also available with an integrated fuel pulsation damper. The FPD upgrade is an OEM-style option that reduces fuel pressure oscillation and noise, flattening out the fuel tables during tuning and smoothing part-throttle engine behavior. There is also an FPD-Ready option for a secondary rail that is FPD compatible however includes a plug for the FPD port.

Compatibility and Fitment Information: This rail was designed for use with 48mm EV14 based injectors and 14mm o-rings. This is one of the most common and typical injector specifications currently available. Please contact us if you need help selecting injectors. This rail is NOT compatible with the original fuel injectors.

  • Top-Feed secondary rail conversions require Air Control Valve (ACV) delete with a low profile block-off plate (Available from CJM)
  • Carefully remove the factory diffusers placed underneath the original fuel injectors.
  • These rails are NOT compatible with the factory fuel lines.


Regulator Type: Add a Fuelab (51502) or Aeromotive (13109) regulator based on your brand preference. There is no known discernible difference in performance.

Mini Pressure Gauge: A small 1/8 NPT liquid-filled pressure gauge that can be installed to regulator. When not installing an in-cabin fuel pressure gauge, you will need this to set and monitor fuel pressure.

Fire Sleeve: Add 3 or 6 feet of quality DEI Fire Sleeve to help protect the hoses from high temperatures and abrasions. This is a black colored sleeve product that you cut to length and slide over the end of the hose. For top-mount turbochargers, additional protection may be required. Protecting your fuel lines is protecting your vehicle!

Secondary Rail Type:

  • 2-Port: A basic rail for 2 secondary injectors, compatible with all known intake manifolds.
  • 2-Port FPD-Ready: This rail has the FPD port, but includes a plug instead of the FPD.
  • 2-Port with FPD: Includes the Fuel Pulsation Damper
  • 4-Port: For use only with aftermarket intake manifolds with additional secondary injector bungs

Detailed Photos & Information:

(FPD Option + Mini Gauge Option + Aeromotive Black Option)

(4-Port Option + Mini Gauge Option + Aeromotive Black Option)

(Secondary Rail, 4 Port vs FPD Option)

(Secondary Rail, 4 Port vs FPD Option)

(Secondary Rail, FPD vs. FPD-Ready demonstration)