Installation Procedure

The fuel injector (1) is stamped with a identification part number (2). A four-digit build date code (3) indicates the month (4), day (5), year (6), and shift (7) that built the injector.

Fig 1: Locating Fuel Injector ID Number

Courtesy of GENERAL MOTORS CORP.

1. Lubricate the NEW injector O-ring seals (2, 4) with clean engine oil.
2. Install the NEW injector O-ring seals onto the fuel injector.
3. Install a NEW retainer clip (1) onto the fuel injector.
Fig 2: View Of Fuel Injector, Clip & O-Rings
Courtesy of GENERAL MOTORS CORP.
4. Push the fuel injector (17) into the fuel rail injector socket with the electrical connector facing outward. The retainer clip (19) locks on to a flange on the fuel rail injector socket.
Fig 3: Exploded View Of Fuel Rails & Injector Components
Courtesy of GENERAL MOTORS CORP.
5. Install the fuel rail. Refer to Fuel Rail Assembly Replacement (4.8L, 5.3L, and 6.0L Engines)  or Fuel Rail Assembly Replacement (5.3L (L59) Engine) .