Sierra Fuel Injectors
Precision Auto Injectors
GMC Sierra Fuel Injectors
Find rebuilt genuine OEM GMC Sierra fuel injector sets by model year, truck series, engine size, fuel type, and original injector number.
Find Your GMC Sierra Injector SetFind the right GMC Sierra injector set in three steps
Confirm the model year and Sierra series, including 1500, 1500HD, 2500, 2500HD, 3500HD, or Classic.
Confirm the engine size, engine code, and whether the truck is gasoline-only or Flex Fuel/E85.
Use the chart and direct product links below, then compare the listing with the number printed on the original injector.
GMC Sierra fuel injector fitment guide
Use this chart to narrow your options. Always confirm the Sierra series, engine, fuel type, engine code, connector, and original injector number before purchasing.
| Years and Sierra Application | Engine and Fuel Type | Injector Number | Direct Product Link |
|---|---|---|---|
| 1996–2000 Select GMC full-size trucks |
7.4L 454 Vortec V8 Gasoline |
Rochester 17103146 / 17120683 |
Shop GMC 7.4L Rochester Injectors |
| 1996–2000 Select GMC full-size trucks |
7.4L 454 Vortec V8 Gasoline |
Bosch four-hole upgrade Direct-fit upgrade for compatible applications |
Shop GMC 7.4L Bosch Upgrade |
| 1999–2007 Sierra |
4.8L, 5.3L, or 6.0L V8 Gasoline/non-flex |
Delphi 25317628 |
Shop Sierra 25317628 Injectors |
| 2002–2006 Sierra 1500 |
5.3L L59 V8, VIN Z Flex Fuel/E85 |
Denso 12580426 / 25326903 Flex Fuel application only |
Shop Sierra 5.3L Flex Injectors |
| 2001–2007 Sierra 2500HD and 3500HD |
8.1L Vortec V8 Gasoline |
Delphi 17124531 Heavy-duty application |
Shop Sierra 8.1L Injectors |
| 2004–2010 |
4.8L, 5.3L, 6.0L, or 6.2L |
Delphi 12580681 |
Shop Sierra 12580681 Injectors |
| 2007–2009 |
5.3L LC9 V8 Flex Fuel/E85 |
Denso 12594512 |
Shop Sierra 12594512 Injectors |
| 2010–2013 Sierra 1500 |
Compatible 4.8L, 5.3L, or 6.0L V8 |
GM 12613411 |
Shop 2010–2013 Sierra Injectors |
| PERFORMANCE INJECTORS FOR MODIFIED GMC SIERRA BUILDS The injector below is not a factory replacement. Professional tuning and a properly sized fuel system are required. | |||
| Modified LS-powered Sierra builds | Compatible modified LS V8 Fuel system must support the required flow |
Denso 84 lb/hr High-flow performance injectors Professional ECU calibration required |
Shop Sierra 84 lb/hr Injectors |
Not sure which GMC Sierra injectors fit?
You do not normally need to remove an injector before contacting us. Have the model year, Sierra series, engine size, engine code, and fuel type ready.
For a 5.3L truck, tell us whether it is gasoline-only or Flex Fuel/E85. For overlapping applications, we may also ask for the eighth VIN digit, complete VIN, or the number printed on the original injector.
Shop rebuilt OEM GMC Sierra fuel injector sets
Choose the product that matches your truck's complete application. Each factory-style V8 set includes eight injectors unless the product listing states otherwise.
Common signs of a failing GMC Sierra fuel injector
A clogged, leaking, unbalanced, or electrically failing injector may contribute to noticeable drivability problems. These symptoms can have other causes, so proper diagnosis is recommended before replacing parts.
- Rough or uneven idle
- Hard starting or extended cranking
- Hesitation during acceleration
- Loss of power under load
- Reduced 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
- Illuminated 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 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 fuel injectors from Precision Auto Injectors?
We make it easier to purchase rebuilt OEM GMC Sierra fuel injectors with direct product links, fitment support, clear warranty coverage, and customer-friendly returns.
How we rebuild and test your GMC Sierra fuel injectors
Every Sierra injector is inspected, electrically tested, leak checked, ultrasonically cleaned, reverse flushed, spray-pattern verified, and dynamically flow tested. Filters, O-rings, caps, and spacers are replaced as applicable before the complete set is flow matched and given a final quality inspection.
GMC Sierra fuel injector questions
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 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 injector 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.
Need help choosing your GMC Sierra injector set?
Call us before ordering. We can help narrow the choices using your Sierra's model year, series, engine size, fuel type, VIN, and original injector number when available.
Call 407-536-4509 for Fitment Help