Sierra fuel injectors
GMC Sierra Fuel Injectors
Shop professionally rebuilt genuine OEM fuel injectors for GMC Sierra 1500, Sierra 2500HD, and Sierra 3500HD trucks. Use the year, engine, fuel type, and original injector part number to find the correct matched set for your Sierra.
View the GMC Sierra Fitment GuideGMC used several different fuel injector designs throughout the Sierra production range. Trucks with the same engine size may use different injectors depending on the model year, engine code, fuel system, and whether the vehicle is gasoline-only or Flex Fuel.
Precision Auto Injectors rebuilds genuine factory-original GM, Delphi, Denso, Rochester, and Bosch injectors. Every complete set is cleaned, serviced, tested, and flow matched before shipment.
How to Find the Correct Fuel Injectors for Your GMC Sierra
Start by using the Year, Make, and Model search tool at the top of our website. Then compare the recommended product with the number and physical design of your original injector.
Verify the following before placing your order:
- GMC Sierra model year
- Sierra 1500, 2500HD, or 3500HD
- Engine size and engine code
- Gasoline-only or Flex Fuel/E85 system
- OEM number printed on the original injector
- Electrical connector and physical injector design
GMC Sierra Fuel Injectors by Year, Engine, and Part Number
1996–2000 GMC 7.4L 454 Vortec Fuel Injectors
Compatible GMC full-size truck applications equipped with the 7.4L 454 CID Vortec engine may use genuine Rochester fuel injectors or a direct-fit Bosch four-hole upgrade.
Genuine OEM Rochester 7.4L Injectors
This option is intended for customers who want to retain the original Rochester injector design.
Shop GMC 7.4L Rochester InjectorsBosch Four-Hole 7.4L Injector Upgrade
The Bosch four-hole injector is a direct-fit upgrade for compatible 1996–2000 7.4L Vortec applications. Its multi-hole nozzle is designed to provide improved fuel atomization while retaining factory-style installation.
Shop the 7.4L Bosch Four-Hole Upgrade1999–2007 GMC Sierra 4.8L, 5.3L, and 6.0L Non-Flex Fuel Injectors
Many early GMC Sierra trucks equipped with gasoline-only 4.8L, 5.3L, or 6.0L engines use genuine Delphi 25317628 fuel injectors.
These injectors are intended as factory-style replacements when the original injector number matches. ECU tuning is normally not required when the correct OEM-specification injector is installed in its original application.
Shop GMC Sierra 25317628 InjectorsGMC Sierra 5.3L Flex Fuel Injectors — Denso 12580426 / 25326903
Compatible GMC Sierra 5.3L Flex Fuel trucks may use genuine Denso injectors carrying GM part numbers 12580426 and 25326903.
Confirm that your Sierra is a Flex Fuel application before ordering. These injectors should not automatically be substituted for gasoline-only 5.3L injectors.
Shop Sierra 12580426 / 25326903 Injectors2001–2007 GMC Sierra 2500HD and 3500HD 8.1L Fuel Injectors
Compatible GMC Sierra HD trucks equipped with the 8.1L Vortec big-block engine may use Delphi 17124531 fuel injectors.
Each set is professionally rebuilt, leak tested, spray-pattern verified, and flow matched for balanced delivery across all eight cylinders.
Shop GMC Sierra 8.1L 17124531 Injectors2004-2010 GMC Sierra Fuel Injectors — Delphi 12580681
Delphi 12580681 fuel injectors were used in select GMC Sierra V8 applications. Exact fitment can vary by year, engine, and fuel system, so the original injector number should be confirmed before ordering.
2007–2009 GMC Sierra 5.3L Flex Fuel Injectors — Denso 12594512
Genuine Denso 12594512 fuel injectors are available for compatible GMC Sierra trucks equipped with the 5.3L LC9 Flex Fuel engine.
These injectors are not interchangeable with every gasoline-only GMC Sierra 5.3L injector. Verify the part number before ordering.
Shop GMC Sierra 12594512 Injectors2010–2013 GMC Sierra 4.8L, 5.3L, and 6.0L Injectors — GM 12613411
GM 12613411 fuel injectors are available for compatible 2010–2013 GMC Sierra applications equipped with 4.8L, 5.3L, or 6.0L V8 engines.
Similar-year Sierra engines may use different injectors, so confirm the original part number and complete application before purchase.
Shop GMC Sierra 12613411 Injectors84 lb/hr High-Flow Injectors for Modified GMC Sierra LS Applications
For modified LS-powered GMC Sierra builds requiring substantially more fuel than the factory injector, decapped Denso 84 lb/hr high-flow injectors are available.
GMC Sierra Fuel Injector Fitment Guide
| OEM Part Number | Common Years | Engine | Fuel Type | Fitment Notes |
|---|---|---|---|---|
| 17103146 / 17120683 | 1996–2000 | 7.4L / 454 V8 | Gasoline | Factory-style Rochester injector |
| Bosch four-hole upgrade | 1996–2000 | 7.4L / 454 V8 | Gasoline | Direct-fit upgrade for compatible applications |
| 25317628 | 1999–2007 | 4.8L / 5.3L / 6.0L | Non-flex gasoline | Match the original injector number |
| 12580426 / 25326903 | Verify application | 5.3L | Flex Fuel / E85 | Confirm Flex Fuel equipment |
| 17124531 | 2001–2007 | 8.1L Vortec | Gasoline | Common Sierra 2500HD / 3500HD application |
| 12580681 | Verify application | 4.8L / 5.3L / 6.0L / 6.2L | Verify application | Original part-number confirmation required |
| 12594512 | 2007–2009 | 5.3L LC9 | Flex Fuel / E85 | Confirm engine code and original number |
| 12613411 | 2010–2013 | 4.8L / 5.3L / 6.0L | Verify application | Match the original injector number |
| Denso 84 lb/hr | Modified applications | Compatible LS-powered Sierra builds | As configured | Performance use; tuning required |
This chart is a general reference. Always confirm the original injector number, connector, engine code, and fuel type before ordering.
Symptoms of Failing GMC Sierra Fuel Injectors
A clogged, leaking, unbalanced, or electrically failing injector may cause noticeable drivability problems.
- Rough or uneven idle
- Hard starting or extended cranking
- Hesitation during acceleration
- Loss of power under load
- Poor fuel economy
- Strong gasoline odor
- Random or cylinder-specific misfires
- P0300 through P0308 trouble codes
- Rich or lean fuel-trim codes
- Black exhaust smoke
- Fuel leaking into a cylinder
- Check Engine Light
An injector may pass a simple electrical resistance check and still have a restricted internal filter, poor spray pattern, delayed opening, leakage, or uneven flow. Professional bench testing evaluates how each injector performs while operating.
Why Flow Matching Matters on a GMC Sierra V8
Each cylinder depends on its injector to deliver a consistent amount of fuel. One restricted injector can cause a cylinder to run lean, while one leaking or excessive-flow injector may cause a rich cylinder, rough starting, fuel odor, or contaminated engine oil.
Precision Auto Injectors dynamically tests and matches the injectors as a complete set. When applicable, we target approximately 2% flow balance across the set.
Our GMC Sierra Fuel Injector Rebuilding Process
- Visual inspection of the injector body, connector, and nozzle
- Electrical resistance, coil-response, and opening-consistency testing
- Leak-down and pressure testing
- Ultrasonic cleaning
- Reverse flushing to remove internal contamination
- Replacement of filters, O-rings, caps, and spacers as applicable
- Dynamic and static flow testing on professional ASNU equipment
- Spray-pattern verification
- Flow matching across the complete set
- Final quality inspection before shipment
Why Choose Genuine OEM GMC Sierra Injectors?
Genuine OEM injectors were engineered for the Sierra's original fuel system. They provide the intended electrical characteristics, dimensions, connector design, opening response, flow calibration, and spray pattern.
Low-cost aftermarket injectors may look similar but can differ in coil quality, internal construction, opening speed, fuel volume, and nozzle calibration. Precision Auto Injectors specializes in rebuilding genuine factory-original injector cores rather than selling unverified copies.
Why Buy GMC Sierra Injectors From Precision Auto Injectors?
- Genuine OEM injector cores
- Professionally rebuilt in-house
- ASNU bench tested
- Ultrasonically cleaned
- Reverse flushed
- Leak tested
- Spray-pattern verified
- Dynamically flow tested
- Flow matched as a complete set
- New service components as applicable
- Lifetime replacement warranty
- 60-day hassle-free returns
Frequently Asked Questions About GMC Sierra Fuel Injectors
How do I know which fuel injectors fit my GMC Sierra?
Fitment depends on the model year, Sierra series, engine, fuel type, engine code, connector, and original OEM injector number. The safest method is to compare the part number printed on the original injector with the product listing.
Are all GMC Sierra 5.3L fuel injectors the same?
No. GMC used different 5.3L injector designs depending on the year, engine code, and fuel system. Gasoline-only and Flex Fuel injectors are not automatically interchangeable.
What is the difference between 25317628 and 25326903 injectors?
Delphi 25317628 is commonly associated with gasoline-only early GM V8 applications. Denso 25326903, also associated with 12580426, is used in compatible 5.3L Flex Fuel applications. Always verify the original number.
Which fuel injectors fit a GMC Sierra 8.1L?
Compatible Sierra 2500HD and Sierra 3500HD trucks equipped with the 8.1L Vortec engine may use Delphi 17124531 injectors. Confirm the original injector number before ordering.
Do stock replacement GMC Sierra injectors require tuning?
Tuning is normally not required when the correct OEM-specification injector is installed in its intended factory application. High-flow performance injectors require proper ECU calibration.
Are your GMC Sierra injectors new or rebuilt?
They are professionally rebuilt genuine OEM injectors. Each set is cleaned, serviced, leak tested, spray-pattern verified, dynamically flow tested, and matched before shipment.
Do the injector sets include new O-rings?
New O-rings are installed as applicable. Internal filters, caps, spacers, and other serviceable components are also replaced when required for the specific injector design.
What should I send if I cannot identify my Sierra injectors?
Send the GMC Sierra model year, series, engine size, eighth VIN digit, fuel type, and clear photographs of the injector body, part number, connector, and nozzle. We can help compare the available options before you place an order.
Shop GMC Sierra Fuel Injectors
Browse our available genuine rebuilt OEM fuel injector sets for GMC Sierra 1500, Sierra 2500HD, and Sierra 3500HD trucks. For the most accurate result, search using the part number printed on your original injector.
View GMC Sierra Fuel Injectors