
Chevrolet GMC LM2/LZO 3.0L Duramax High Pressure Fuel Rail 2020-2025: OEM 55505909
CHEVROLET GMC LM2/LZO 3.0L DURAMAX HIGH PRESSURE FUEL RAIL 2020-2025: OEM 55505909

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine New, AC Delco High Pressure Fuel Rail, AC Delco part number 55505909 ( OEM Part Number 55505909 ).This part is primarily made for a Chevrolet GMC LM2/LZO 3.0L Duramax, production years 2020-2025, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
Primary OEM | 55505909 |
Additional OEM | 55505909 |
ADDITIONAL DETAILS
CONDITION | Genuine New |
UPC / Barcode | |
WEIGHT | 0.00 LBS |
SHIPPING OPTIONS
Ship Weight : 0.00 LBS
UPS Ground, 2nd Day Air, Next Day Air
SHIPPING POLICY
Drive On Diesel 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 Drive On Diesel 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.
Drive On Diesel 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 Drive On Diesel, 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). Drive On Diesel 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 Drive On Diesel, 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.
The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Drive On Diesel offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.
The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.
All fluids must be drained.
If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.
Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Drive On Diesel core charge presented to you online today with your item is representative of the most common core charge.
FITMENT CHART
YEAR | MAKE | ENGINE(S) | ||||
---|---|---|---|---|---|---|
2020 | Chevrolet GMC | LM2/LZO 3.0L Duramax | ||||
2021 | Chevrolet GMC | LM2/LZO 3.0L Duramax | ||||
2022 | Chevrolet GMC | LM2/LZO 3.0L Duramax | ||||
2023 | Chevrolet GMC | LM2/LZO 3.0L Duramax | ||||
2024 | Chevrolet GMC | LM2/LZO 3.0L Duramax | ||||
2025 | Chevrolet GMC | LM2/LZO 3.0L Duramax |
PEOPLE ALSO ASKS | BLOG(S)
The high pressure fuel rail in the Chevrolet and GMC LM2 and LZO 3.0L Duramax diesel engines is a critical component in the common rail fuel injection system. The OEM part number 55505909 is specifically engineered for model years 2020 through 2025, ensuring reliable fuel delivery under extreme conditions.
This component stores and regulates pressurized diesel fuel before it's distributed to the injectors. It must maintain consistent pressure to support efficient combustion and accurate injection timing.
Key Features and Design Elements of OEM 55505909:
- High-Strength Rail Body
- Constructed to handle extreme fuel pressure demands.
- Integrated Fuel Pressure Sensor Port
- Allows real-time feedback to the ECU.
- Injector Feed Ports
- Ensure equal fuel distribution to all cylinders.
- Fuel Inlet Connection
- Receives high-pressure fuel from the pump.
- Precision Mounting Points
- Match factory specs for secure installation.
Designed specifically for the 3.0L LM2 and LZO Duramax engines, this OEM rail offers a precise fit and consistent operation. Regular inspection and proper torque during installation are essential to prevent leaks and maintain fuel system integrity. For optimal engine function, always use compatible components and follow vehicle-specific service procedures.
The high-pressure fuel rail is essential for maintaining consistent fuel delivery to your engine’s injectors. When it starts to fail, the signs can be subtle at first but often escalate quickly. Catching these early symptoms can help avoid costly repairs or breakdowns.
Common warning signs include:
- Hard starting
- The engine may crank longer than usual or struggle to start, especially when cold.
- Rough idle or misfires
- Inconsistent fuel pressure can cause the engine to run unevenly or skip a cylinder.
- Loss of power under load
- The vehicle may feel sluggish when accelerating or going uphill due to inadequate fuel delivery.
- Check engine light
- Fault codes related to fuel pressure (like P0087, P0088, or P0191) may appear.
- Increased fuel consumption
- Irregular pressure can cause inefficient combustion, leading to higher fuel use.
- Fuel smell or visible leaks
- Cracks or faulty fittings on the rail can leak fuel—this is both a hazard and a clear warning.
If you notice any of these signs, it’s important to diagnose the system promptly. Ignoring a faulty fuel rail can lead to injector damage, poor drivability, and potential safety risks.
Yes, a leak can cause improper combustion and trigger emissions-related diagnostic codes.