The ACDelco 12479302 is a GM fuel injector used across multiple General Motors vehicles from the 1990s through early 2000s

ACDelco 12479302 is the part number for a fuel injector manufactured by General Motors' parts division. This injector fits vehicles including the Chevrolet Silverado, Suburban, Tahoe, and GMC Sierra, primarily in model years 1996 through 2002, though availability varies by engine size and configuration. The part is a direct replacement for the original fuel delivery component in those vehicles.

If you are shopping for this part, you will encounter it under different names depending on the supplier. Some retailers list it as ACDelco 12479302, while others cross-reference it to Bosch part numbers or aftermarket equivalents. Understanding these cross-references saves you money and prevents ordering the wrong injector for your engine.

Key Takeaways

  • ACDelco 12479302 is a fuel injector for 1996–2002 GM trucks and SUVs with 5.7L or 6.5L diesel engines, not gasoline engines.
  • Bosch 0437502047 is the most common cross-reference, as Bosch manufactured the injector for GM.
  • Aftermarket suppliers like Delphi and Standard Motor Products offer equivalent injectors under different part numbers, typically costing 30–50% less than OEM.
  • Always confirm your engine displacement and fuel type before ordering, because ACDelco uses the same number format across different injector designs.
  • Fuel injectors are not interchangeable between gasoline and diesel engines, and mixing them will cause starting problems or engine damage.

Why the ACDelco number matters for ordering

ACDelco part numbers follow a strict format that tells you the component type and process. The 12479302 breaks down as a fuel system component designed for specific GM engine families. When you search for this number online, you are telling the supplier exactly which injector you need, which reduces the chance of receiving the wrong part.

However, ACDelco numbers do not always tell you the engine size or fuel type. A Chevrolet Silverado from 1999 could have a 5.7L gasoline engine or a 6.5L diesel engine, and each requires a different injector. Before you order, confirm your engine size from your vehicle's door jamb label or owner's manual. The door jamb label lists the engine displacement and fuel type in a format like "5.7L V8" or "6.5L Diesel."

Common cross-references and equivalent part numbers

The Bosch 0437502047 is the most widely recognized equivalent because Bosch supplied the injector to General Motors during manufacturing. Many parts suppliers list both numbers on the same product page, so searching for either one will often show you the same physical part. Bosch numbers are useful if you are buying from a supplier that specializes in Bosch products or if you want to verify the injector's origin.

Aftermarket manufacturers also produce fuel injectors for this process. Delphi, Standard Motor Products, and Motorcraft all make injectors that fit the same engine bays. These parts typically cost between $40 and $80 per injector, compared to $120 to $180 for ACDelco OEM. The trade-off is warranty length—OEM parts usually carry a longer warranty, while aftermarket injectors often come with 12-month coverage. Cross-reference charts at parts retailers like RockAuto or Summit Racing will show you the equivalent Delphi or Standard number for your specific engine.

How to verify you have the right part before checkout

Most online parts retailers include a "fitment" or "vehicle selector" tool. Enter your vehicle's year, make, model, and engine size, and the system will show you which injectors fit. This step is critical because it prevents you from ordering a part that looks identical but does not work in your engine. If the tool shows multiple injector options for your vehicle, that means your truck or SUV came with different engine choices from the factory.

If you are buying from a local parts store, bring your vehicle's VIN (Vehicle Identification Number) with you. The counter staff can look up your exact engine configuration and confirm the correct part number. The VIN is printed on your vehicle's dashboard at the base of the windshield and also appears on your registration and insurance documents. This step takes five minutes and eliminates guesswork.

Diesel vs. gasoline injectors—why you cannot mix them

The ACDelco 12479302 is designed for diesel engines, specifically the 6.5L diesel found in Silverados and Sierras from that era. Diesel injectors operate at much higher pressures than gasoline injectors and have different spray patterns. If you install a diesel injector in a gasoline engine, the engine will not start or will run extremely rough. The reverse is equally problematic—a gasoline injector in a diesel engine will fail when ready under the high pressure of diesel combustion.

Your vehicle's fuel door or door jamb label will clearly state "Diesel" or "Gasoline." If you are unsure, check your owner's manual or call your vehicle's manufacturer with your VIN. Do not guess, because the cost of replacing an engine is far higher than the cost of confirming the fuel type before you buy an injector.

Where to buy and what to expect on price

ACDelco parts are sold through GM dealerships, online retailers like Amazon and eBay, and national chains like AutoZone and O'Reilly Auto Parts. Dealerships typically charge the highest price but offer the longest warranty and may provide fitment. Online retailers often undercut dealership prices by 20–40%, but you need to confirm fitment yourself using the vehicle selector tool.

Aftermarket injectors from Delphi or Standard Motor Products are usually the cheapest option and work reliably for most drivers. However, if your vehicle has high mileage or you plan to keep it long-term, the OEM injector's longer warranty may justify the extra cost. Fuel injectors typically last 80,000 to 100,000 miles, so if your truck is at 120,000 miles, you are buying a replacement that may need replacing again in a few years.

Installation and what to do if the part does not fit

Fuel injector replacement requires removing the fuel rail, which sits on top of the engine. This is a job most DIY mechanics can handle with basic tools, though you will need a fuel pressure gauge to test the system afterward. If you are not comfortable working on fuel systems, a mechanic can install the injector in 1–2 hours, typically charging $100 to $200 in labor.

If you receive a part that does not fit, most retailers offer returns within 30 days. Keep your receipt and the original packaging. If the part is defective, contact the manufacturer—ACDelco, Bosch, and Delphi all have warranty claim processes that can send you a replacement at no cost. Do not attempt to force a part that does not fit, because you risk damaging the fuel rail or engine block.

Frequently Asked Questions

Can I use a Bosch injector instead of ACDelco?

Yes. Bosch 0437502047 is the original manufacturer part, so it is identical to the ACDelco 12479302 in form and function. Many mechanics prefer Bosch because the part number directly identifies the manufacturer, reducing confusion. Both will work equally well in your engine.

What if my truck has a 5.7L gasoline engine instead of diesel?

The 5.7L gasoline Silverado uses a different injector entirely. Do not order the 12479302—it will not fit. Use your vehicle selector tool or call a parts retailer with your VIN to find the correct gasoline injector for your engine. Mixing fuel types will prevent your truck from starting.

How do I know if my fuel injector is actually bad?

Common signs include rough idle, poor fuel economy, hard starting, or a check engine light. A mechanic can test injector resistance with a multimeter or use a fuel pressure gauge to confirm flow. Do not replace an injector without diagnosis, because the problem may be a fuel filter, pump, or electrical connector instead.

Is there a warranty on aftermarket fuel injectors?

Most aftermarket injectors come with a 12-month or 12,000-mile warranty, whichever comes first. ACDelco OEM injectors typically carry a 3-year or 36,000-mile warranty. Check the retailer's return policy before you buy, because some online sellers do not accept returns on fuel system parts.

Can I buy just one injector or do I need to replace all of them?

You can replace a single injector if only one is faulty. However, if your truck has high mileage, the other injectors may fail soon after. Some mechanics recommend replacing all injectors at once to avoid repeat repairs, but this is optional unless multiple injectors test bad.