Cummins QSB 6.7L High Pressure Fuel Rail 2011-2020: OEM 3977530
CUMMINS QSB 6.7L HIGH PRESSURE FUEL RAIL 2011-2020: OEM 3977530
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine New, Bosch High Pressure Fuel Rail, Bosch part number 3977530 ( OEM Part Number 3977530 ).This part is primarily made for a Cummins QSB 6.7L, production years 2011-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 3977530 |
| Additional OEM | 3977530 |
ADDITIONAL DETAILS
| CONDITION | Genuine New |
| UPC / Barcode | 00840490542594 |
| WEIGHT | 8.00 LBS |
SHIPPING OPTIONS
Ship Weight : 8.00 LBS
UPS Ground, 2nd Day Air, Next Day Air
SHIPPING POLICY
Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.
The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.
Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.
Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".
If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.
As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.
What is a Core Charge?
A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.
30 Day Core Charge Hold
You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.
"This Product Doesn't Have a Core"
Built for precision and durability, the Cummins QSB 6.7L High Pressure Fuel Rail OEM 3977530 is designed to deliver consistent fuel pressure and distribution for engines manufactured between 2011 and 2020. This genuine OEM component is engineered to Cummins factory specifications, ensuring accurate fitment, dependable performance, and seamless integration within the fuel system. By maintaining proper fuel flow to the injectors, it supports efficient combustion, smooth engine operation, and optimal fuel economy. Its rugged construction is built to handle high-pressure conditions and the demanding environments of industrial, agricultural, and on-highway applications. For operators and technicians, this fuel rail provides OEM-certified quality, long-lasting reliability, and consistent engine performance.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2011 | Cummins | QSB 6.7L | ||||
| 2012 | Cummins | QSB 6.7L | ||||
| 2013 | Cummins | QSB 6.7L | ||||
| 2014 | Cummins | QSB 6.7L | ||||
| 2015 | Cummins | QSB 6.7L | ||||
| 2016 | Cummins | QSB 6.7L | ||||
| 2017 | Cummins | QSB 6.7L | ||||
| 2018 | Cummins | QSB 6.7L | ||||
| 2019 | Cummins | QSB 6.7L | ||||
| 2020 | Cummins | QSB 6.7L | ||||
PEOPLE ALSO ASKS | BLOG(S)
The high-pressure fuel rail is a crucial component in a common-rail fuel injection system. It sits between the high-pressure pump and the injectors, distributing pressurized fuel to each cylinder. Here are its typical parts:
Main Components
- Rail Body / Manifold Housing
- The strong-walled metal tube or block that holds fuel under high pressure and connects to all injectors.
- Fuel Inlet Port
- The connection where pressurized fuel enters the rail from the high-pressure pump.
- Injector Outlet Ports / Plenum Passages
- Machined channels that lead from the rail body to each injector, supplying them with high-pressure fuel.
- Pressure Relief / Regulator Valve
- A valve that protects the system by allowing excess fuel to bypass or return to the supply side when pressures exceed safe limits.
- Rail Pressure Sensor / Transducer Port
- A port and sensor that measure the pressure inside the rail and transmit that data to the engine control module (ECM).
- Seals, Gaskets & O-Rings
- Elastomeric seals at all mating surfaces and ports, ensuring fuel containment under high pressure.
- Mounting Brackets / Flanges
- Flanges or brackets by which the rail is secured to the engine structure.
- Internal Passageways & Fuel Channels
- Precision-machined internal channels that guide and distribute fuel evenly to each injector port.
Each of these components works together to maintain stable, equal distribution of high-pressure fuel to every injector, provide pressure feedback, and protect the high-pressure system from overpressure or leakage.
The high-pressure fuel rail is a key component in modern fuel injection systems. It stores and delivers pressurized fuel to the injectors, ensuring precise and efficient combustion. Since it operates under extreme pressure and temperature, its longevity depends on maintenance, fuel quality, and overall system care.
Average Lifespan of a High-Pressure Fuel Rail
A properly maintained high-pressure fuel rail typically lasts 100,000 to 150,000 miles — and often longer in well-maintained vehicles. However, factors like contamination, corrosion, or excessive pressure can shorten its lifespan.
Factors That Affect Longevity:
- Fuel Quality:
- Low-quality or contaminated fuel can cause rust, pitting, or clogging inside the rail.
- Fuel Filter Maintenance:
- Skipping filter replacements allows debris to reach the rail and injectors.
- Operating Pressure:
- Excessive fuel pressure from a faulty pump or regulator can stress the rail.
- Moisture and Corrosion:
- Water in the fuel system leads to internal rust and eventual leaks.
- Driving Conditions:
- Frequent heavy loads, idling, or poor maintenance can accelerate wear.
How to Extend Fuel Rail Lifespan
You can maximize the life of your fuel rail and avoid premature failure by following a few simple steps:
- Always use high-quality, clean fuel.
- Replace fuel filters at manufacturer-recommended intervals.
- Keep the fuel system sealed and free of moisture.
- Address fuel pressure or leak issues immediately.
- Have your system inspected regularly for early signs of corrosion or damage.
A high-pressure fuel rail can last 100,000 to 150,000 miles, depending on maintenance and fuel quality. Proper fuel system care, clean filters, and regular inspections are the keys to long-lasting performance and reliability.
Yes, debris or water in the system can corrode the rail and clog injector passages.
No calibration is needed, but fuel pressure verification should be performed after installation.
Yes, pressure loss due to leaks can cause long crank times and unstable idle.
Replace fuel filters regularly and use clean, high-quality diesel fuel.
Cummins High Pressure Fuel Rails
