Description
The S&S Diesel Motorsport® Double-Barrel Fuel Rail is built for max-effort 6.7L Cummins competition applications that demand more rail volume, more stable pressure, and more flexible fuel system configuration. With 2.5x the volume of a stock 6.7L Cummins rail, this bare rail helps reduce pressure drop during high-demand injection events while giving builders multiple options for feed port, sensor, and PRV placement.
Factory common rail fuel systems were never designed for the kind of injected quantity demanded by today’s high-output diesel builds. As fuel quantity increases, rail pressure can drop during the injection event — costing consistency, control, and performance.
The S&S Diesel Motorsport Double-Barrel Fuel Rail solves that problem by increasing available pressurized fuel volume. With 66.1 cc of total volume, this rail offers 154% more capacity than a stock 6.7L Cummins fuel rail, helping maintain pressure more consistently throughout the injection event.
Designed for 6.7L Cummins max-effort competition applications, the Double-Barrel Fuel Rail uses a modular bare-rail layout so builders can configure feed ports, sensors, plugs, and pressure relief valves around their specific setup. It is tested to 3,000 bar / 43,511 psi, made in the USA, and built for serious diesel performance programs.
Key Features
- 2.5x stock rail volume — 66.1 cc total capacity
- 154% more volume than a stock 6.7L Cummins fuel rail
- Helps maintain rail pressure during high-demand injection events
- Allows more injected quantity for the same injection duration
- Improves rail pressure control through more consistent sensor feedback
- Modular port layout for flexible feed, sensor, and PRV placement
- Tested to 3,000 bar / 43,511 psi
- Bare rail design for custom competition fuel system setups
- Made in the USA
Fitment / Application
| Make | Engine | Application |
|---|---|---|
| Ram / Dodge Cummins | 6.7L Cummins | Max-effort competition use |
Technical Specifications
| Spec | Detail |
|---|---|
| Part Number | RAIL-DBL-BRL |
| Fuel Compatibility | Diesel |
| Volume | 66.1 cc / 4.03 cu in |
| Weight | 4.35 kg / 9.6 lbs |
| Maximum Dimensions | 369 mm x 120 mm x 48 mm |
| Tested Pressure | 3,000 bar / 43,511 psi |
| Inlet Ports | 2x M14 x 1.5 Male |
| Injector Ports | 6x M18 x 1.5 Male |
| Auxiliary Ports | 4x M18 x 1.5 Female |
Important Notes
This rail is sold as a bare rail and does not include plugs, fittings, sensors, or pressure relief valves. Additional components should be selected based on the final fuel system layout.
S&S notes that the 2007.5–2018 6.7L Cummins fuel system was designed to operate at 1,800 bar. Even though this rail has been tested to 3,000 bar, they do not recommend running injectors at that pressure because injector return increases rapidly above 1,800 bar, which can prematurely wear injectors and overwork high-pressure fuel pumps.
| Component | Part Number |
|---|---|
| M18x1.5 Rail Cap | CAP-M18 |
| M14x1.5 Rail Cap | CAP-M14 |
| M18x1.5 Rail Plug | PLUG-M18 |
| M18x1.5 to M14x1.5 Feed Fitting | 8000040 |
| 1850 Bar Single Stage PRV | PRV-E-1850-1S |
| 2200 Bar Single Stage PRV | PRV-E-2200-1S |
| 2400 Bar Single Stage PRV | PRV-E-2400-1S |
| 0–2000 Bar Rail Pressure Sensor | RDS-2000 |
| 0–2200 Bar Rail Pressure Sensor | RDS-2200 |
| 0–2400 Bar Rail Pressure Sensor | RDS-2400 |
| 0–2700 Bar Rail Pressure Sensor | RDS-2700 |
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