GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 Engine 🢒 Engine Controls - 4.3L 🢒 Fuel Pressure Regulator Replacement (CSFI)

Removal Procedure
  1. Disconnect the negative battery cable.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  3. Remove the upper manifold assembly. Refer to Engine Mechanical.

Disassemble Procedure

    Object Number: 12911 Size: SH

    Important: If the fuel pressure regulator is to be reinstalled, inspect the filter screen (if equipped) for contamination. If the filter screen is contaminated, remove and discard.

  1. Disassemble the fuel pressure regulator snap ring retainer.

    2. Object Number: 12912 Size: SH
  2. Disassemble the regulator assembly and the O-rings.
  3. Discard the O-rings.

Assemble Procedure

    Object Number: 12912 Size: SH
  1. Lubricate the new O-rings with clean engine oil.
  2. Install the backup O-ring, the large O-ring, the filter and the small O-ring.

    3. Object Number: 12911 Size: SH
  3. Assemble the regulator with the vacuum tube pointing down into the snap ring retainer.

Installation Procedure
  1. Install the upper manifold assembly. Refer to Engine Mechanical.
  2. Connect the negative battery cable.