1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to Camshaft Retard Offset Adjustment .
3. Remove the upper manifold assembly. Refer to Engine Mechanical.

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. Disassemble the regulator assembly and the O-rings.
3. Discard the O-rings.

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

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. Assemble the regulator with the vacuum tube pointing down into the snap ring retainer.

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