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Removal & Installation (4.8L, 5.3L & 6.0L)

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CAUTION: Three styles of fuel pressure regulators and fuel rails will be used in this model year. Each regulator has a different footprint that consequently changes the size of the receiving port on the fuel rail. The regulator retaining clips are specific to each rail-regulator design and cannot be interchanged.
NOTE: Numbers in parenthesis refer to numbers in illustrations.
  1. Remove the engine cover. Relieve the fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Disconnect the fuel pressure regulator vacuum line. Clean any dirt from the fuel pressure regulator retainer and the surrounding area.
  2. Remove the fuel pressure regulator retainer (1). See Fig 1. Remove the fuel pressure regulator (2).
  3. Ensure that the backup ring (3), regulator seal "O" ring (4 and 6) and regulator filter (5) are not still in the fuel rail.
  4. Ensure that the NEW fuel pressure regulator retainer is the correct one. See Fig 2. The tabs (1) are used on the straight vacuum port retainer (2), and the E85 straight vacuum port retainer (3). The angle vacuum port retainer (4) has no tabs.
  5. Install the following parts onto the fuel pressure regulator (9), if necessary: Backup ring (10) Regulator seal "O" ring (11) Regulator filter (12) Regulator seal "O" ring (13) Lubricate the fuel pressure regulator "O" rings (11, 13) with clean engine oil. Install the fuel pressure regulator (9).
    6. CAUTION: Whenever the fuel pressure regulator is removed from the fuel rail, NEW "O" rings and NEW retaining clips should be used on reinstallation.
  6. Install the NEW fuel pressure regulator retainer (8). Connect the fuel pressure regulator vacuum line. Tighten the fuel fill cap.
  7. Connect the negative battery cable. Tighten the fuel filler cap. Turn ignition on for 2 seconds. Turn ignition off for 10 seconds. Turn ignition on. Inspect for fuel leaks. Install the engine cover.
Fig 1: Exploded View Of Fuel Pressure Regulator (4.8, 5.3L & 6.0L)
G00252113Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Fuel Pressure Regulator Retainers (4.8, 5.3L & 6.0L)
G00252114Courtesy of GENERAL MOTORS CORP.
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