Hummer Fuel Injectors

Precision Auto Injectors

Hummer Fuel Injectors

Find rebuilt genuine OEM fuel injector sets for select Hummer H2, H3 Alpha and H3T Alpha V8 applications. Match your vehicle using its model year, engine size and original injector number.

Find Your Hummer Injector Set

Find the right Hummer injector set in three steps

1. Identify the Hummer model
Confirm whether the vehicle is an H2, H3, or H3T. These models do not automatically use the same injectors.
2. Check the year and engine
Confirm the exact model year and whether the vehicle has a 6.0L, 6.2L, or 5.3L V8.
3. Match the injector number
Use the chart and direct product links below, then compare the listing with the number on the original injector.

Hummer fuel injector fitment guide

Find your exact Hummer model below, then match its model year, engine size, and original injector number. Each application has a separate row to make the chart easier to follow.

Years and Hummer Model Engine Injector Number Direct Product Link
2003–2007
Hummer H2		 6.0L V8
Gasoline/non-flex		 Delphi 25317628

 Shop 2003–2007 H2 6.0L Injectors
2008
Hummer H2		 6.2L V8
Gasoline		 Delphi 12580681

 Shop 2008 H2 6.2L Injectors
2008–2009
Hummer H3 Alpha		 5.3L V8
Alpha model only		 Delphi 12580681
 Shop H3 Alpha 5.3L Injectors
2009
Hummer H3T Alpha		 5.3L V8
Alpha model only		 Delphi 12580681
 Shop 2009 H3T Alpha Injectors

The Hummer model and engine both matter

Earlier H2 6.0L models and the 2008 H2 6.2L do not use the same injector set. The engine change is why the injector part number also changes.

For the H3 or H3T, confirm that the vehicle has the 5.3L V8 Alpha powertrain. The 12580681 injectors listed here are not intended for the 3.5L or 3.7L five-cylinder engine.

Shop rebuilt OEM Hummer fuel injector sets

Choose the product that matches your Hummer's complete application. Each V8 product below is sold as a complete set of eight rebuilt genuine OEM injectors.

2003–2007 Hummer H2 6.0L

Vehicle: Hummer H2

Engine: 6.0L V8

Fuel type: Gasoline/non-flex

Delphi number: 25317628

Shop Hummer H2 25317628 Set
Hummer H2, H3 Alpha and H3T Alpha V8

Applications: 2008 H2, 2008–2009 H3 Alpha and 2009 H3T Alpha

Engines: H2 6.2L or H3/H3T 5.3L V8

Delphi number: 12580681

Connector: EV6/USCAR

Shop Hummer 12580681 Set
View All Hummer Fuel Injectors

Common signs of a failing Hummer fuel injector

A dirty, restricted, leaking, or electrically failing injector may contribute to the symptoms below. These symptoms can have other causes, so proper diagnosis is recommended before replacing parts.

  • Rough or unstable idle
  • Hard starting or extended cranking
  • Engine misfires or Check Engine Light codes
  • Hesitation or loss of power under load
  • Reduced fuel economy
  • Strong gasoline odor or dark exhaust smoke
  • Rich or lean fuel-trim codes

Why buy Hummer fuel injectors from Precision Auto Injectors?

We make it easier to purchase rebuilt OEM Hummer fuel injectors with direct product links, fitment support, clear warranty coverage, and customer-friendly returns.

Genuine OEM injector cores We rebuild genuine OEM GM and Delphi injector cores instead of relying on unknown low-cost imitation injectors.
Lifetime replacement warranty Injector sets purchased directly through our website are supported by our lifetime replacement warranty.
60-day return period Our return policy allows eligible orders to be returned within 60 days of delivery.
Real fitment support Contact our team for help checking your Hummer's model, year, engine, VIN, and original injector number.

How we rebuild and test your Hummer fuel injectors

Every Hummer injector set is professionally cleaned, electrically tested, leak checked, spray-pattern verified, and flow matched before shipment.

ASNU fuel injector cleaning and flow-testing equipment at Precision Auto Injectors

Hummer fuel injector questions

Will replacing worn Hummer injectors improve fuel economy?

It may restore normal fuel economy if leaking, restricted, or poorly balanced injectors were causing excessive fuel consumption. Replacing properly functioning injectors will not necessarily improve mileage beyond the vehicle’s normal performance.

Can a bad Hummer fuel injector damage the catalytic converter?

Yes. An injector that delivers too much fuel can cause unburned gasoline to enter the exhaust and overheat the catalytic converter. A continuing misfire or flashing Check Engine Light should be addressed promptly.

What does Alpha mean on a Hummer H3 or H3T?

For the applications covered on this page, Alpha identifies the V8-powered H3 or H3T. Confirm that the vehicle has the 5.3L V8 because the five-cylinder H3 models use different fuel-system components.

Why does the oil in my Hummer smell like gasoline?

A leaking injector can allow fuel to enter a cylinder and mix with the engine oil. Fuel-diluted oil provides less protection for internal engine parts. Avoid unnecessary driving and have the vehicle inspected promptly.

Do factory-style Hummer replacement injectors require tuning?

No tuning is required when the correct factory-style injector number is installed in its original application. The replacement injector must match the vehicle's year, model, engine, and original fuel-system calibration.

Need help choosing your Hummer injector set?

Call us before ordering. We can help narrow the options using your Hummer model, year, engine size, VIN, and original injector number when available.

Call 407-536-4509 for Fitment Help