Product Description
Hold rail pressure under heavy load with the Exergy E07 00018 Race-Only Pressure Relief Valve (PRV). Calibrated to approx. 2600 bar (37.7k PSI), this PRV helps prevent premature rail pressure bleed-off in high-demand applications on Cummins 6.7L and Duramax LLY/LBZ/LMM platforms.
Key Benefits
- Higher opening pressure target (~2600 bar) vs. tired/low-threshold stock valves
- Supports tuned and performance builds to maintain commanded rail pressure
- Precision-calibrated by Exergy Performance
- Direct replacement—no permanent modifications required
Fitment
- Cummins 6.7L: 2007.5–2018+ Ram applications using common-rail (verify connector/rail style by year)
- Duramax: LLY (2004.5–2005), LBZ (2006–2007), LMM (2007.5–2010)
- Mounts in the factory rail PRV location; reuses OE line routing
What’s Included
- Exergy E07 00018 Race-Only Pressure Relief Valve (PRV)
- Install guidance (general best practices)
Recommended Supporting Parts
Maximize rail stability and component life with proper fuel supply and matched injectors:
- Lift Pumps (AirDog / FASS)
- Exergy Brand Injectors & Fuel System Components (select your platform)
- Gaskets & Seals
Install Notes
- Relieve system pressure before removal. Keep fittings and ports meticulously clean.
- Torque the PRV to OEM specification for your platform/rail (refer to factory service data).
- Prime/bleed the fuel system after install; verify no leaks and monitor commanded vs. actual rail pressure.
- Because this is race-only calibration, proper tuning and healthy supply-side fuel pressure are strongly recommended.
Frequently Asked Questions
Q: Is this PRV street legal?
A: No. It is designated race-only and intended for closed-course/off-road competition.
Q: Do I need custom tuning?
A: While not strictly required on every setup, tuning is recommended to ensure commanded rail pressure, safe duration, and proper fail-safes under load.
Q: Will this fix low rail pressure caused by weak supply?
A: A PRV cannot compensate for inadequate supply pressure or clogged filtration. Pair with a quality lift pump and ensure filters are fresh.
Q: Which injectors pair well with this?
A: Choose Exergy injectors sized for your goals and platform. Browse all Exergy options here: Exergy at CPP Diesel.
Q: Any special maintenance?
A: Maintain clean fuel and quality filtration; contamination is the #1 cause of high-pressure fuel system issues.
About Exergy Performance
Exergy is a leader in precision-calibrated common-rail components for diesel performance. Explore the full Exergy lineup here: Exergy Performance at CPP Diesel.
