Hummer Fuel Injectors
Choosing the correct Hummer fuel injectors depends on the year, make, model, engine size, and OEM injector number. This guide covers rebuilt genuine GM injector sets for select 2003–2008 Hummer H2, 2008–2009 Hummer H3 5.3L V8, and 2009 Hummer H3T 5.3L V8 applications.
View the Hummer fuel injector fitment guide
The Hummer H2 changed from a 6.0L V8 to a 6.2L V8 for the 2008 model year, and that change also brought a different injector application. The H3 and H3T were offered with more than one engine, so a set listed for the 5.3L V8 should not be ordered for a 3.5L or 3.7L five-cylinder model.
Precision Auto Injectors rebuilds genuine factory-original GM fuel injectors. Each complete set of eight is professionally cleaned, tested, serviced, and flow matched before shipment.
How to Find the Correct Fuel Injectors for Your Hummer
Start with the Year, Make, and Model search tool at the top of our website. Compare the recommended product with the number and physical design of your original injector.
Key factors to find the correct injector:
- Hummer H2, H3, or H3T model
- Vehicle model year
- 6.0L, 6.2L, or 5.3L V8 engine
The OEM number is the strongest confirmation.
Hummer Fuel Injectors by year, make, model, and Engine
2003–2007 Hummer H2 6.0L Injectors — GM 25317628
Genuine GM 25317628 fuel injectors fit 2003–2007 Hummer H2 models equipped with the 6.0L V8.
- OEM part number: 25317628
- Manufacturer: Delphi / GM
- Common years: 2003–2007
- Vehicle: Hummer H2
- Engine: 6.0L V8
- Fuel system: Gasoline / non-flex factory application
- Injector type: Factory-style OEM replacement
- Quantity: Set of 8
No tuning is required when genuine 25317628 injectors are installed in a H2 originally equipped with the same part number.
Shop 2003–2007 Hummer H2 25317628 injectors
2008 Hummer H2 6.2L Injectors — GM 12580681
The 2008 Hummer H2 uses a 6.2L V8 rather than the earlier H2 6.0L engine. 2008 H2 6.2L models use genuine GM 12580681 fuel injectors.
- OEM part number: 12580681
- Manufacturer: Delphi / GM
- Model year: 2008
- Vehicle: Hummer H2
- Engine: 6.2L V8
- Flow rating: Approximately 30 lb/hr at 58 PSI
- Connector: EV6 / USCAR
- Injector type: Factory-style OEM replacement
- Quantity: Set of 8
Shop 2008 Hummer H2 12580681 injectors
2008–2009 Hummer H3 and 2009 H3T 5.3L V8 Injectors — GM 12580681
Genuine Delphi 12580681 injectors are also listed for compatible 2008–2009 Hummer H3 models and the 2009 Hummer H3T equipped with the 5.3L V8. These V8 models are commonly identified as Alpha applications.
- OEM part number: 12580681
- Manufacturer: Delphi / GM
- H3 years: 2008–2009
- H3T year: 2009
- Engine: 5.3L V8
- Common configuration: H3 Alpha / H3T Alpha
- Flow rating: Approximately 30 lb/hr at 58 PSI
- Connector: EV6 / USCAR
- Quantity: Set of 8
Shop Hummer H3 and H3T 5.3L injectors
Hummer Fuel Injector Fitment Guide
This chart applies to the two injector products listed on this page. Always confirm the OEM number, engine, connector, fuel system, and complete vehicle application before ordering.
25317628 vs. 12580681 Hummer Injectors
Delphi 25317628 and 12580681 are both genuine GM-style injectors, but they are used in different Hummer engines and model years:
- 25317628: Compatible 2003–2007 Hummer H2 with the 6.0L V8.
- 12580681: Compatible 2008 Hummer H2 with the 6.2L V8.
- 12580681: Compatible 2008–2009 Hummer H3 and 2009 H3T with the 5.3L V8.
The two injector numbers should not be interchanged simply because both fit GM V8 engines. Flow characteristics, engine calibration, connector design, and original application must match.
Symptoms of Failing Hummer Fuel Injectors
A clogged, leaking, electrically failing, or uneven injector may contribute to noticeable drivability problems:
- Rough or unstable 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-contaminated engine oil
- Check Engine Light
These symptoms can have more than one cause. Ignition coils, spark plugs, intake leaks, fuel pressure, compression, wiring, and other systems may create similar problems. Proper diagnosis is recommended before replacing parts.
Why Flow Matching Matters on a Hummer V8
Every cylinder depends on its injector to deliver a consistent amount of fuel. A restricted injector can cause one cylinder to run lean or misfire. A leaking or excessive-flow injector may cause a rich cylinder, difficult starting, fuel odor, carbon buildup, or fuel dilution in the engine oil.
Testing the complete set makes it possible to compare injector performance under the same operating conditions. Precision Auto Injectors dynamically tests and flow matches each set to support balanced cylinder-to-cylinder fuel delivery.
Our Hummer Fuel Injector Rebuilding Process
- Visual inspection of each injector body, connector, and nozzle
- Electrical coil and opening-response testing
- High-pressure leak and leak-down 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 of eight
- Final quality inspection before shipment
Why Choose Genuine OEM Hummer Injectors?
Genuine GM injectors were engineered for their approved GM fuel systems. Correct OEM injectors provide the intended dimensions, connector design, electrical behavior, opening response, fuel delivery, and spray pattern.
Low-cost replica injectors may look similar externally while using different internal components and calibration. Differences in coil quality, opening time, flow rate, or spray targeting can create drivability problems even when the injector physically fits. Rebuilt genuine OEM cores retain the factory injector design.
Why Buy Hummer Injectors From Precision Auto Injectors?
- Genuine Delphi and GM OEM injector cores
- Professionally rebuilt in-house
- ASNU bench tested
- Ultrasonically cleaned and reverse flushed
- Electrically tested
- Leak tested and spray-pattern verified
- Dynamically flow tested
- Flow matched as a complete set of eight
- New service components installed as applicable
- Lifetime replacement warranty
- 60-day hassle-free returns
Frequently Asked Questions About Hummer Fuel Injectors
Which fuel injectors fit a 2003–2007 Hummer H2?
2003–2007 Hummer H2 models with the 6.0L V8 may use genuine GM 25317628 fuel injectors. Confirm the number printed on the original injector before ordering.
Which fuel injectors fit a 2008 Hummer H2?
The 2008 Hummer H2 uses a 6.2L V8 and use genuine GM 12580681 injectors. Do not assume that the earlier H2 25317628 set is interchangeable.
Which injectors fit a Hummer H3 Alpha?
2008–2009 Hummer H3 Alpha models with the 5.3L V8 use GM 12580681 injectors. Verify the factory V8 engine and original injector number.
Which injectors fit a 2009 Hummer H3T Alpha?
The 2009 Hummer H3T equipped with the 5.3L V8 may use GM 12580681 injectors. Confirm that the vehicle is the V8/Alpha application and match the original number.
Are all Hummer H2 fuel injectors the same?
No 2003–2007 H2 6.0L models use GM 25317628, while the compatible 2008 H2 6.2L application uses Delphi 12580681.
Do stock replacement Hummer injectors require tuning?
No our injectors are factory OEM fuel injectors and when applied to correct year, make, model are direct installation
Should I replace one injector or the complete set?
A complete set is the most recommended option, swapping to a clean flow matched set will be the best answer to a fuel injector related issue with a vehicle.
Are these Hummer fuel injectors new or rebuilt?
They are genuine GM OEM injector cores that have been professionally rebuilt, cleaned, tested, and flow matched. Review the individual product page for exact specifications and included service components.
What should I send if I cannot identify my Hummer injectors?
Get in contact with our team here at precision and provide us with year, make, model, and engine size and we will be able to help you find the correct injector.
Shop Hummer Fuel Injectors
Order rebuilt genuine OEM fuel injectors for Hummer H2, H3, and H3T V8 applications. For the most accurate result, use the Year, Make, and Model search tool and compare the recommended set with the number printed on your original injector.