Fuel Pressure Regulator Replacement 4.3L (RPO L35) Engine

1. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical-4.3L.
2. Remove and discard the fuel pressure regulator retainer clip (13).
3. Twist and pull the fuel pressure regulator (14) in order to remove the regulator from the housing using a shop towel to catch any spilled fuel.
4. Remove and discard the regulator seal O-ring (18).
5. Remove and discard the regulator filter (17).
6. Remove and discard the regulator seal O-ring (16).
7. Remove and discard the backup ring (15).
8. Cover the fuel pressure regulator housing to prevent contamination from entering the fuel system.

1. Lubricate the NEW O-rings seals with clean engine oil.
2. Assemble the following NEW parts to the fuel pressure regulator:

•	Backup ring (15)

•	Regulator seal O-ring (16)

•	Regulator filter (17)

•	Regulator seal O-ring (18)

3. Install the fuel pressure regulator with the vacuum tube pointing down.
4. Install the fuel pressure regulator retainer clip (13).
5. Install the upper manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical-4.3L.

Fuel Pressure Regulator Replacement 4.3L (RPO LU3) Engine

1. Remove the upper intake manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical-4.3L.
2. Remove the fuel pressure regulator retainer clip (5).
3. Twist and pull the fuel pressure regulator (6) in order to remove the regulator from the housing using a shop towel to catch any spilled fuel.
4. Remove and discard the regulator seal O-ring (10).
5. Remove and discard the regulator filter (9).
6. Remove and discard the regulator seal O-ring (8).
7. Remove and discard the backup ring (7).
8. Cover the fuel pressure regulator housing to prevent contamination from entering the fuel system.

1. Lubricate the NEW O-rings seals with clean engine oil.
2. Assemble the following NEW parts to the fuel pressure regulator:

•	Backup ring (7)

•	Regulator seal O-ring (8)

•	Regulator filter (9)

•	Regulator seal O-ring (10)

3. Install the fuel pressure regulator with the vacuum tube pointing down.
4. Install the fuel pressure regulator retainer clip (5).
5. Install the upper manifold. Refer to Upper Intake Manifold Replacement in Engine Mechanical-4.3L.