Mercury F2VY-9A407-A Fuel Pump Assembly

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To perform the fuel pressure test, you will need a fuel pressure gauge and adapter set. Before proceeding, relieve the fuel system pressure and lay a shop towel over any fuel connection to absorb residual fuel. Start the preliminary inspection by checking if the fuel system delivers the proper amount of fuel. Listen for a whirring sound at the fuel filler opening when turning the ignition key to the On position. If there's no sound, check the fuel pump fuse, relay, and circuit. Check for battery voltage to the fuel pump relay connector and power relay connector. If there's no voltage, inspect the fuses and wiring circuit. For the operating pressure check, attach the fuel pressure gauge to the test port and activate the fuel pump without starting the engine. Note the fuel pressure and start the engine to measure the pressure while idling. Detach the vacuum hose from the fuel pressure regulator to check for an immediate increase in pressure. If pressure is too high, inspect for obstructions or replace the fuel pressure regulator. If pressure is low, check the fuel filter and hoses, and if needed, replace the fuel pressure regulator or check the fuel pump. For the fuel pump output pressure check (dead-head pressure), use a fuel pressure gauge with a bleeder valve to relieve pressure after the test. Attach the gauge directly to the fuel feed line at the fuel tank and bridge the terminals on the Diagnostic Test connector to activate the fuel pump. Note the pressure reading and compare it after five minutes. If the hold pressure is less than specified, check the fuel line for leaks or replace the fuel pump.

Unbolt the fuel tank straps and lower the tank partially. Disconnect the fuel lines and electrical connector from the fuel pump assembly, and remove the assembly from the tank by tapping the locking ring counterclockwise. Replace the old lock ring gasket and clean or install the new strainer if necessary. Separate the fuel pump from the assembly by removing the clamp and disconnecting the electrical connector. Clean the mounting surfaces and seal ring groove before installing the new pump.

If the pressure is too high, check the air vent for any blockages before considering pump replacement.

Attach the lines to the pump.

The fuel system should be depressurized, and components reconnected as appropriate.

The new pump will come with a new strainer.

The fuel pump operates when the engine is cranking or running and receives ignition reference pulses from the electronic ignition system.

Clean the mounting flange and tank surface.