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Hummer 12599504 Multiport Fuel Injector

2008 Hummer H3

Customer Questions & Expert Answers (2)
12599504 GM Multiport Fuel Injector Product Photo 1 of 4
  • Part Description
    Injector,Multiport Fuel ; Injector, Fuel Injection
  • Manufacturer
    General Motors
Make sure this part fits
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  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Hummer
    Manufacturer Part Number12599504
    Part DescriptionInjector,Multiport Fuel ; Injector, Fuel Injection
    Other NamesInjector
    Item Dimensions4.2 x 2.1 x 2.1 inches
    Item Weight0.40 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU12599504
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2008 Hummer H35 Cyl 3.7LSUV
  • Customer Questions & Expert Answers

    Q:
    I'm wondering if this is complete and correct part for my vehicle.
    A:
    You can Select Your Vehicle to check if 12599504 fits your vehicle.
    Posted and answered by GM Parts Specialist Julian
    Q:
    How to remove the Fuel Rail and Fuel Injectors on Chevrolet Trailblazer? Posted by Elsayed M.
    A:
    First, relieve fuel system pressure and disconnect the negative battery cable. Remove the intake manifold and clean the fuel rail/injector area. Disconnect the fuel pressure regulator vacuum line, fuel injector harness connector, and fuel line fittings. Remove the fuel rail attaching bolts and free it from the cylinder head. Disconnect the electrical connector from the injector(s), remove the retaining clip(s), and remove the injector(s) from the fuel rail assembly. Replace the injector o-rings, lubricate them with clean engine oil, and press the injector into the fuel rail. Install the injector retaining clips and check the cylinder head injector holes for cleaning. After installation, check for fuel leakage. V8 Removal: Begin by relieving the fuel system pressure and disconnecting the negative battery cable. Remove the air intake duct and resonator, and disconnect any electrical connectors. Disconnect the accelerator cable and cruise control cable from the throttle body. Clean the fuel rail/injector area, disconnect the fuel injector electrical connectors and remove the PCV valve and hose. Disconnect the fuel supply and return lines from the fuel rail. Remove the fuel rail mounting bolts, and remove the fuel rail and injectors as an assembly. Replace the injector o-rings, lubricate them with clean engine oil, and press the injector into the fuel rail. Install the injector retaining clips and place the injector and fuel rail assembly on the intake manifold. After installation, check for fuel leakage.
    You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Bob / Apr 15, 2026

Genuine GM Part 12599504, the Right Choice

To ensure reliability, purchase GM part # 12599504 Multiport Fuel Injector. It is sometimes referred to as Hummer Fuel Injector. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Hummer H3 models.

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