2004.5-2010 GM/CHEVROLET 6.6L DURAMAX LLY LBZ LMM
2007.5-2018 DODGE 6.7L CUMMINS
RACE FUEL RAIL PLUG W/ VITON O-RING
Optimize your fuel system and eliminate unwanted pressure loss with this Race Fuel Rail Plug featuring a high-heat-resistant Viton O-ring. This plug replaces the factory Fuel Pressure Relief Valve (PRV), which is prone to leaking under high-demand conditions—especially with aftermarket tuning or aggressive driving.
The OEM PRV is designed to bleed off excess fuel rail pressure above ~27,000 PSI. However, this becomes a performance bottleneck when running higher rail pressures via custom tuning or heavy load applications. A leaking or weak PRV can cause fuel pressure drop, performance loss, and trigger diagnostic trouble codes (DTCs) like P0087 or P1011.
Installing this race-style plug eliminates the relief function entirely, sealing off the pressure relief port and ensuring consistent fuel delivery to your injectors. This upgrade is ideal for tuned or high-performance diesel trucks, as well as those experiencing rail pressure issues even at factory settings.
What’s Included in the Kit:
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(1) Race Fuel Rail Plug
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(1) High-Temperature Viton O-Ring (pre-installed)
Key Benefits:
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Eliminates factory fuel pressure relief valve (PRV)
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Prevents fuel pressure bleed-off during high-load or tuned conditions
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Helps maintain full rail pressure under throttle
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Eliminates common low fuel pressure trouble codes
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Ideal for modified or performance-tuned engines
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Direct-fit design for easy installation
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Compatible with Duramax and Cummins fuel rail systems
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Made from durable, heat-resistant materials for long service life
Trouble Code Guide:
If you're seeing these codes, this fuel rail plug may be the fix you need:
P0087 – Fuel Rail/System Pressure Too Low
- This code indicates that the fuel rail pressure is below the level required by the engine. Often caused by a leaking or failed pressure relief valve (PRV), especially under wide-open throttle or heavy load.
P1011 – Fuel Rail Pressure Malfunction
- This code means the fuel rail pressure is not meeting the expected values. It can be triggered by a weak PRV spring, internal valve leak, or excessive pressure relief during operation.
Installing this race fuel rail plug can help eliminate these codes by sealing off the relief port completely, allowing the high-pressure system to maintain proper fuel rail values during demanding conditions.
Vehicle Compatibility:
GM / Chevrolet Duramax 6.6L Diesel
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2004.5–2005 Silverado/Sierra 2500HD & 3500 (LLY)
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2006–2007 Silverado/Sierra 2500HD & 3500 (LBZ)
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2007.5–2010 Silverado/Sierra 2500HD & 3500 (LMM)
Dodge / Ram Cummins 6.7L Diesel
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2007.5–2018 Ram 2500 & 3500 with 6.7L Cummins
This plug is an essential upgrade for any diesel owner dealing with low rail pressure codes or running custom tuning that demands more consistent fuel delivery. Simple, effective, and reliable.
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✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
✔️ Tracking information will be provided once the item ships.
✔️ Shipping to PO Boxes, APO/FPO may be limited based on carrier restrictions.
California Proposition 65 Warning:
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
Big Dawg Diesel Disclaimer:
This is a race-only product. It is not legal for sale or use on pollution controlled vehicles that are driven on public streets, roads, or highways. Buyer's use or installation of this product for itself or for Buyer's customer is at Buyer's own risk. The Buyer is responsible for obeying federal, state, and local laws. Only Buyer can determine end customer's use and thus assumes any and all liability hereby waiving any and all claims against Big Dawg Diesel in the sale of this product to the maximum extent permissible by law. Make sure to abide by all local, state, and federal laws, including emissions, vehicle safety, and traffic laws. It is Buyer's responsibility to know what those laws are and how they apply to Buyer or Buyer's customer. This product is designed and intended solely for legally organized and sanctioned, closed-course, off-road competition use and is not for use on public streets, roads, or highways. This product is capable of disabling the emissions system on some vehicles. Use on public streets, roads, or highways is a violation of federal and certain state (including California) and local environmental laws.
