Mercury F4SZ-9C968-A Regulator - Fuel Pressure

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Tests include an overpressure test, an underpressure test, a demand regulating test, and a regulator check valve function test.

Continue by disconnecting the PCV system and, if present, the canister purge line and EGR spacer coolant lines, draining the coolant if needed. Remove the six upper intake manifold retaining bolts and lift off the upper intake manifold and throttle body as an assembly from the lower intake manifold.

The regulator utilizes engine vacuum, an internal diaphragm, and a spring to adjust the restriction based on engine demands.

Relieve fuel pressure, remove the air intake plenum assembly on 5.0L engines or the air intake assembly on 4.6L engines, and remove the fuel rail assembly. Detach the electrical connectors from the injectors, remove the injectors, inspect and replace injector O-rings and other components as needed. Lubricate new O-rings with oil before installation and twist to install the injectors. The remainder of the installation is the reverse of removal.